{"product_id":"knifetooth-dogfish-jaw-with-data","title":"Knifetooth Dogfish Jaw with Data ex Dr.Gordon Hubbell","description":"\u003ch2\u003eNO INTERNATIONAL SHIPPING\u003c\/h2\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eKnifetooth Dogfish Jaw with Data (\u003cem\u003eScymnodon ringens\u003c\/em\u003e)\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe name is not hyperbole. The lower teeth of \u003cem\u003eScymnodon ringens\u003c\/em\u003e are genuinely knife-like — enormous, high-cusped blades that stand in stark contrast to the small, lanceolate upper teeth, creating one of the most dramatically asymmetric dentitions in any shark jaw. This is a specimen that announces itself the moment someone looks into it. From Dr. Gordon Hubbell's collection comes a jaw that pairs this arresting morphology with the locality data and provenance that elevates it from curiosity to serious scientific artifact.\u003c\/p\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eSpecies \u0026amp; Classification\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eScymnodon ringens\u003c\/em\u003e (Barbosa du Bocage \u0026amp; de Brito Capello, 1864)\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eCommon Names:\u003c\/strong\u003e Knifetooth Dogfish, Knife-tooth Shark\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eFamily:\u003c\/strong\u003e Somniosidae (Sleeper Sharks)\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eOrder:\u003c\/strong\u003e Squaliformes\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eEtymology:\u003c\/strong\u003e \u003cem\u003eScymnodon\u003c\/em\u003e derives from \u003cem\u003escymnus\u003c\/em\u003e, an ancient name for a type of shark from the Greek word for \"young animal, cub or whelp,\" and \u003cem\u003eodon\u003c\/em\u003e (Greek for tooth), referring to the large, triangular cutting teeth on the lower jaw; \u003cem\u003eringens\u003c\/em\u003e is Latin for \"gaping,\" referring to its large, wide open mouth \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.fishbase.org\/summary\/700\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eFishBase\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eBiology \u0026amp; Physical Characteristics\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eBlack in color; small dorsal fin spines; short snout; small lanceolate teeth without cusplets in the upper jaw and huge, high, knife-cusped cutting teeth in the lower jaw; mouth very wide and broadly arched; caudal fin with weak subterminal notch and no lower lobe \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/shark-references.com\/species\/view\/Scymnodon-ringens\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eShark-References\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eMaximum length 110 cm \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/shark-references.com\/species\/view\/Scymnodon-ringens\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eShark-References\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eDepth range 200–1,600 m; usually 550–1,450 m; bathypelagic \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.fishbase.org\/summary\/700\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eFishBase\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eTooth formula: 24–25 upper tooth rows \/ 14–15 lower tooth rows \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/shark-references.com\/species\/view\/Scymnodon-ringens\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eShark-References\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e — with the lower teeth dramatically larger than the upper, creating the species' defining visual character\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eNo anal fin; two small dorsal fin spines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eHabitat \u0026amp; Distribution\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eFound in the eastern Atlantic from Scotland to Spain, Portugal, and Senegal, and the southwest Pacific from New Zealand, at depths of 200–1,600 m \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Scymnodon_ringens\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eWikipedia\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eEastern Atlantic range runs along the continental slope from Scotland to Senegal; also recorded from New Zealand in the Southwest Pacific \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.fishbase.org\/summary\/700\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eFishBase\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eRecorded from the continental slope; may find some refuge at depth beyond the reach of commercial fishing gear \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.researchgate.net\/publication\/353644550_Scymnodon_ringens-Knifetooth_Dogfish_The_IUCN_Red_List_of_Threatened_Species_2020\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eResearchGate\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eThe disjunct distribution — eastern Atlantic and southwest Pacific — with no confirmed intermediate records makes any specimen with verified locality data scientifically significant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eDiet \u0026amp; Behavior\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eLikely feeds on deep-sea fishes and cephalopods, inferred from the highly specialized blade-like lower dentition adapted for cutting large prey\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eConsidered harmless to humans \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/shark-references.com\/species\/view\/Scymnodon-ringens\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eShark-References\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e due to its deep-water habitat and non-aggressive nature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eReproduction\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eProbably ovoviviparous; exhibits distinct pairing with embrace \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/shark-references.com\/species\/view\/Scymnodon-ringens\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eShark-References\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eAge parameters are unknown but can be inferred from the related Longnose Velvet Dogfish (\u003cem\u003eCentroselachus crepidater\u003c\/em\u003e), which has a female age-at-maturity of 20 years, a maximum age of 54 years, and a generation length of 37 years \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.researchgate.net\/publication\/353644550_Scymnodon_ringens-Knifetooth_Dogfish_The_IUCN_Red_List_of_Threatened_Species_2020\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eResearchGate\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e — suggesting an exceptionally slow life history\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eConservation Status\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eListed as \u003cstrong\u003eVulnerable\u003c\/strong\u003e by the IUCN (2020); estimated to have undergone a population reduction of 30–49% over the past three generations (approximately 111 years) based on abundance data and exploitation levels \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.researchgate.net\/publication\/353644550_Scymnodon_ringens-Knifetooth_Dogfish_The_IUCN_Red_List_of_Threatened_Species_2020\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eResearchGate\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eSqualid shark landings in the Mauritanian hake fishery, including the Knifetooth Dogfish, declined from 158 tonnes to 37 tonnes, with a minimum of 3.5 tonnes reported in 1999 — a reduction of more than 99% over three generations \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.researchgate.net\/publication\/353644550_Scymnodon_ringens-Knifetooth_Dogfish_The_IUCN_Red_List_of_Threatened_Species_2020\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eResearchGate\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eNot included in EU Total Allowable Catch for deepwater sharks; not covered by fisheries measures \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.sharkwater.com\/shark-database\/sharks\/knite-tooth-dogfish\/\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eSharkwater\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eHigh distribution overlap with intensive fishing pressure, reported declines in parts of its range, and a lack of species-specific management across its entire range \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.researchgate.net\/publication\/353644550_Scymnodon_ringens-Knifetooth_Dogfish_The_IUCN_Red_List_of_Threatened_Species_2020\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eResearchGate\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eMisc. \u0026amp; Collector Facts\u003c\/h3\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eThe asymmetric dentition of the Knifetooth Dogfish — tiny upper teeth paired with enormous lower knife-blades — is among the most visually dramatic jaw morphologies in the entire order Squaliformes, and arguably in any shark family\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eNothing else is known of its biology beyond size and distribution \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.researchgate.net\/publication\/353644550_Scymnodon_ringens-Knifetooth_Dogfish_The_IUCN_Red_List_of_Threatened_Species_2020\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eResearchGate\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e — one of the most data-poor shark species in the North Atlantic, making physical specimens with collection data a genuine contribution to the scientific record\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eAlongside the Plunket Shark (\u003cem\u003eScymnodon plunketi\u003c\/em\u003e), this jaw represents the genus \u003cem\u003eScymnodon\u003c\/em\u003e — a small, seldom-encountered group within Somniosidae with only four recognized species worldwide\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eUsually dried and salted for human consumption where retained; taken in bottom trawls, with line gear, and with fixed bottom nets \u003cspan class=\"inline-flex\" data-state=\"closed\"\u003e\u003ca href=\"https:\/\/www.sharkwater.com\/shark-database\/sharks\/knite-tooth-dogfish\/\" class=\"group\/tag relative h-[18px] rounded-full inline-flex items-center overflow-hidden -translate-y-px cursor-pointer\" target=\"_blank\"\u003e\u003cspan class=\"relative transition-colors h-full max-w-[180px] overflow-hidden px-1.5 inline-flex items-center font-small rounded-full border-0.5 border-border-300 bg-bg-200 group-hover\/tag:bg-accent-900 group-hover\/tag:border-accent-100\/60\"\u003e\u003cspan class=\"text-nowrap text-text-300 break-all truncate font-normal group-hover\/tag:text-text-200\"\u003eSharkwater\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"transition-all opacity-[0%] h-[17px] absolute right-[0.5px] inline rounded-r-full flex items-center px-1.5 bg-gradient-to-r from-accent-900\/0 via-accent-900\/100 via-30% to-accent-900\/100 group-hover\/tag:opacity-[100%]\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"14\" height=\"14\" fill=\"currentColor\" viewbox=\"0 0 256 256\" class=\"transition-all group-hover\/tag:ease-out duration-[500ms] ease-in text-accent-100 group-hover\/tag:scale-[100%] scale-[80%] group-hover\/tag:opacity-[100%] opacity-[0%] -mr-[2px]\"\u003e\u003cpath d=\"M200,64V168a8,8,0,0,1-16,0V83.31L69.66,197.66a8,8,0,0,1-11.32-11.32L172.69,72H88a8,8,0,0,1,0-16H192A8,8,0,0,1,200,64Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003e\"With data\"\u003c\/strong\u003e includes collection locality and specimen documentation — essential for a species with a fragmented, poorly understood distribution across two widely separated ocean regions\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eDr. Gordon Hubbell provenance\u003c\/strong\u003e adds significant authentication and collectibility value\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eIdeal for: \u003cstrong\u003eSomniosidae and sleeper shark collectors, Atlantic deepwater specimen enthusiasts, jaw morphology–focused collections, Scymnodon genus specialists, museum-quality natural history displays\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Shark Jaws Online","offers":[{"title":"Default Title","offer_id":43138616262719,"sku":"3941","price":525.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/0131\/6159\/files\/Untitled_959768ca-e8ba-47f0-9bd9-582df8fec01f.jpg?v=1776358774","url":"https:\/\/sharkjawsonline.com\/products\/knifetooth-dogfish-jaw-with-data","provider":"Shark Jaws Online","version":"1.0","type":"link"}