Brown Smoothhound Jaw w/DATA ex Dr. Gordon Hubbell

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Brown Smoothhound Jaw with Data (Mustelus henlei)

The Pacific counterpart to the Dusky Smoothhound, Mustelus henlei is a fixture of the eastern Pacific coastline — and a jaw with collection data from Dr. Gordon Hubbell's archive gives this well-studied species the provenance and scientific grounding that separates a specimen from a souvenir. Iridescent bronze coloration, pavement-like crushing teeth, and a range stretching from California to Peru make this one of the most recognizable houndsharks of the Americas.

Species & Classification

• Scientific Name: Mustelus henlei (Gill, 1863)
• Common Names: Brown Smoothhound, Brown Smooth-hound
• Family: Triakidae (Houndsharks)
• Order: Carcharhiniformes
• Etymology: Mustelus is Latin for "weasel," an ancient name applied to sharks for their swift, predatory nature; henlei honors German anatomist and physiologist Friedrich Gustav Jakob Henle, a pioneer in vertebrate morphology

Biology & Physical Characteristics

• Iridescent bronzy-brown above, occasionally greyish, white below; no white spots, dark spots, or dark bars Shark-References
• Slender body with a fairly long, pointed snout; upper labial furrows noticeably longer than lower; small visible spiracle behind the eye; first and second dorsal fin posterior margins and upper caudal lobe distinctly frayed Sharks and Rays
• Maximum reported length 95–100 cm; average size between 50 and 70 cm Wikipedia
• Males mature at 52–66 cm; females at 51–63 cm IUCN Red List
• Low, flattened, pavement-like teeth adapted for crushing hard-shelled prey — distinctive and immediately identifiable in jaw specimens
• Large eyes; heterocercal caudal fin with an elongate upper lobe; broad triangular dorsal fins and broad pectoral fins Wikipedia

Habitat & Distribution

• Found on the continental shelves of the subtropical eastern Pacific, from northern California to the Gulf of California, as well as Ecuador and Peru, from the surface to a depth of 200 m iNaturalist
• Shows a strong preference for shallow muddy or sandy bays, utilizing them for feeding and refuge from larger predators Springer
• Movements within bays are influenced by tidal cycles — moving toward the inner bay on incoming tides and toward the outer bay on outgoing tides Springer
• Present in deeper water closer to the equator Sharks and Rays
• Demersal on the continental shelf at depths from the surface to 369 m IUCN Red List

Diet & Behavior

• Feeds heavily on benthic organisms including crabs, shrimp, and polychaete worms Springer
• Immature sharks display a highly diverse diet including shrimps, teleosts, stomatopods, and cephalopods Shark-References
• Remains in bays throughout most of the year, but may leave during winter as waters cool and rains reduce salinity Springer

Reproduction

• Viviparous with a yolk-sac placenta; litters of 3–5 young; size at birth 19–21 cm; distinct pairing with embrace during mating Shark-References
• Early age at maturity of 2–3 years and annual reproduction make this one of the most resilient Mustelus species to fishing pressure IUCN Red List
• Brown Smoothhound scored highest among Pacific shark species in its ability to rebound from fishing pressure, owing to early maturation CA

Conservation Status

• No declines reported across its range despite heavy targeting in the Sea of Cortez; a fast-growing species able to withstand fishing pressure Sharks and Rays
• Brown Smoothhound accounted for 45.5% of artisanal shark fisheries catch on the west coast of Baja California Sur sampled between 2000–2013 IUCN Red List
• Population is considered stable across its range; listed as a species of low vulnerability due to high productivity IUCN Red List

Misc. & Collector Facts

• The bronze iridescence of this species in life is genuinely striking — and its crushing dentition, nearly identical in function to the Dusky Smoothhound (M. canis) but separated by an entire ocean, makes pairing the two jaws a compelling comparative display
• Four other Mustelus species occur around Baja California alone IUCN Red List — locality data accompanying this jaw is key to confirming species identification with confidence
• "With data" includes collection locality and specimen documentation — essential for a genus where species boundaries are frequently debated
• Dr. Gordon Hubbell provenance adds significant authentication and collectibility value
• Ideal for: eastern Pacific shark collectors, Triakidae specialists, comparative houndshark displays, natural history and museum-quality specimens