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Squaliformes (Dogfish, Gulper Sharks)

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Two dorsal fins are present which may have spines; anal fins are absent. There are five gill slits and spiracles. A small nictitating membrane is present in the lower lid (Nelson et al. 2016). The spiny dogfish (Squalus acanthias) has been a common species in research studies.

Clinical Guide to Fish Medicine

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