The roughskin dogfish, scientifically known as ... doesn't taper abruptly after the pectoral area. This shark has black or dark brown skin coloration. Its large, lateral trunk denticles have ...

A CT scan image of the spiral intestine of a Pacific spiny dogfish shark (Squalus suckleyi). The beginning of the intestine is on the left, and the end is on the right. Disclaimer: AAAS and ...