Shark is not actually a shark. ©Totti, CC BY-SA 4.0, via Wikimedia Commons – Original / License Elephant Sharks (Callorhinchus milii) are a type of cartilaginous fish that live in the deep sea ...
The selachians (true sharks) lost fewer gene families than Callorhinchus (144 vs. 2269 overall gene families, 83 vs. 1422 gnathostome-derived gene families), but future improved taxon sampling may ...
The pectoral fins of ancestral fishes had multiple proximal elements connected to their pectoral girdles. During the fin-to-limb transition, anterior proximal elements were lost and only the most ...
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