Cookiecutter Shark Jaw with Data ex Dr. Gordon Hubbell

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Cookiecutter Shark Jaw with Data (Isistius brasiliensis)

Few sharks in existence punch above their weight like the Cookiecutter. At under 56 cm long, it has left its mark — literally — on sperm whales, nuclear submarines, transatlantic cables, great white sharks, and the occasional unfortunate human swimmer. Dr. Gordon Hubbell himself rolled the lower teeth forward into the characteristic feeding position, displaying exactly how this animal carved cookie-shaped wounds into some of the ocean's largest creatures — a preparation detail that reflects the same scientific care and intention he brought to every specimen in his collection. Cookiecutter sharks are elusive and rarely encountered, and prepared jaws are almost never offered for sale. In over two decades of handling shark material, this is the only one I have ever had to offer — and I have never seen another appear on the market. If you've been waiting for this one, this is it.

Species & Classification

• Scientific Name: Isistius brasiliensis (Quoy & Gaimard, 1824)
• Common Names: Cookiecutter Shark, Cigar Shark, Luminous Shark, Smalltooth Cookiecutter Shark, Demon Whale-Biter
• Family: Dalatiidae
• Order: Squaliformes
• Etymology: The genus name Isistius is derived from Isis, the Egyptian goddess of light, referencing the species' bioluminescent properties; brasiliensis refers to its presence in the waters off the coast of Brazil, where the type specimen was collected Florida Museum

Biology & Physical Characteristics

• Elongated, cigar-shaped body with a short, bulbously rounded snout; large oval green eyes; chocolate brown above, subtly lighter below; a dark "collar" wraps around the gill region; fins have translucent margins except the caudal fin Wikipedia
• Two spineless dorsal fins placed far back on the body; no anal fin; broad caudal fin with the lower lobe almost as large as the upper Wikipedia
• Maximum size approximately 56 cm; males mature at 31–37 cm; females at 38–44 cm; size at birth 14–15 cm IUCN Red List
• Small, erect, hooked upper teeth grip prey while the large, serrated lower teeth — shed in complete rows rather than individually — cut a perfectly circular plug of flesh MarineBio
• Lower teeth are swallowed as they are replaced in rows, possibly to recycle calcium Shark Research Institute
• Enormous liver comprising as much as 35% of total body weight, perfused with low-density oils rendering the shark nearly neutrally buoyant across a wide range of depths Elasmo Research

Habitat & Distribution

• Lives in warm, oceanic waters worldwide, particularly near islands; recorded as deep as 3.7 km Wikipedia
• Migrates vertically up to 3 km every day — approaching the surface at dusk and descending with the dawn Wikipedia
• Undertakes diel vertical migrations from probably below 1,000 m during the day to near the surface at night; may occur as deep as 3,500 m IUCN Red List
• Found in the Atlantic, southern Indian, and Pacific Oceans; generally only caught at night Shark Research Institute

Feeding Strategy & Behavior

• Its dark collar mimics the silhouette of a small fish to lure larger predators; the rest of the body blends into downwelling light via ventral photophores; when a would-be predator approaches, the shark attaches using suctorial lips and excises a chunk of flesh using its bandsaw-like lower teeth Wikipedia
• Thick lips and modified pharynx are used to attach to prey; razor-sharp lower teeth bite into skin while twisting movements cut out a plug of flesh; the shark pulls free holding the plug by its hook-like upper teeth, leaving behind a crater wound Shark Research Institute
• Reported to have attacked rubber sonar domes on nuclear submarines; documented attacks on long-distance swimmers Shark Research Institute
• Prey includes large marine mammals, tuna, billfish, great white sharks, dolphins, and whales — as well as smaller whole prey such as squid and crustaceans

Reproduction

• Lecithotrophic viviparous; the only examined gravid female contained 9 near-term embryos IUCN Red List
• Hatching takes place between 12–22 months; 6–12 pups per litter; young are fully developed and able to hunt independently at birth MarineBio

Conservation Status

• Listed as Least Concern by the IUCN; small size and deep-water behavior limits capture overall, and the species is extremely widespread IUCN Red List
• An occasional bycatch of oceanic trawl and longline fisheries; generally too small to be utilized commercially IUCN Red List

Misc. & Collector Facts

• Cookiecutter shark bite wounds have been documented on an extraordinary range of victims: sperm whales, great white sharks, mako sharks, dolphins, tuna, billfish, transatlantic cables, nuclear submarine sonar domes, and human beings — a predatory résumé unmatched by any shark its size on earth
• The species was originally known as the "cigar shark" until Stewart Springer — the same ichthyologist who described dozens of shark species — coined the name "cookiecutter shark," having first called them "demon whale-biters" Wikipedia
• The lower teeth of Isistius brasiliensis are shed as an entire connected row — a biological quirk unique among sharks — and are visible as a unified band in the jaw; this makes the prepared jaw unlike any other shark jaw in a collection
• Complex bioluminescent photophores densely cover the entire underside, producing a vivid green glow Wikipedia — making this one of only two bioluminescent shark families alongside the Etmopteridae
• "With data" includes collection locality and specimen documentation — meaningful for a species whose patchy distribution records are built almost entirely from incidental captures
• Dr. Gordon Hubbell provenance adds significant authentication and collectibility value
• Ideal for: Dalatiidae and Squaliformes collectors, bioluminescence enthusiasts, natural history centerpiece displays, educational collections, museum-quality specimens