A fish with hips

by Greg Mayer The four-legged land vertebrates– amphibians, reptiles, birds, and mammals, collectively known as tetrapods— get around, at least mostly, on their four legs. Their front and hind limbs are attached, respectively, to their pectoral and pelvic girdles, bones that attach or closely adhere to the axial skeleton. The pectoral girdle consists of the […]

Coelacanth genome sequenced

by Greg Mayer Coelacanths are one of the three surviving groups of sarcopterygian (lobe-finned) fishes, and along with lungfish, one of the two groups that have remained fish in the vernacular sense (we tetrapods, the third surviving group, have of course become legged). The coelacanths also have a tremendous back story: known in the fossil […]

Good new paper on the fish-tetrapod transition

Thanks to Carl Zimmer for pointing out a new paper by Jenny Clack in Evolution: Education and Outreach: “The Fish-Tetrapod Transition: New Fossils and Interpretations.” This is a good paper for the non-scientist who wants to know more about the documentation of this important transition. In WEIT I wrote mostly about the Tiktaalik roseae transitional […]