"Lateral view of dogfish (Scyllium catulus). Note ventral mouth with naso-buccal groove, heterocercal tail, and unpaired fins. gs., Gill-slits; pc., pectoral fins; pv., pelvic fins." -Thomson, 1916

Dogfish

"Lateral view of dogfish (Scyllium catulus). Note ventral mouth with naso-buccal groove, heterocercal…