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Trigonognathus


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Trigonognathus kabeyai Mochizuki & Ohe, 1990
Waniguch tunozame (Ja-crocodilemouth dogfish), En-Viper dogfish


Trigonognathus kabeyai Mochizuki & Ohe, 1990: male, 22.5 cm TL. Suruga Bay, at a depth of 200 m.




Skin

left; back skin, middle; middle skin, right; belly skin. The skin was treated with 3 % hydroperoxide over night at RT.
Jaw






Teeth





This shark is a deep-sea shark with a triangular jaw, as its genus name implies, and has unusually large symphyseal teeth. Generally, the shark's symphysial teeth are very small or absent. It is thought that this is because the joint is mechanically very weak and cannot withstand a large load. However, this peculiar shark has taken the tactic of using large symphysial teeth as a method of foraging in the deep sea. To enable this foraging tactic, the shark provided cartilage pedestals (Symphysial cartilage) to reinforce the joint. In addition, the shape of the jaw is a triangle instead of the usual semi-circle.

Mar. 22, 2022



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