[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

RE: Turtles and Crocodylians are not Reptiles - no? What are they?

Quoting Tim Williams <twilliams_alpha@hotmail.com>:

Closer to hippos thant to mesonychids anyway.

Actually, no. Under Thewissen &c's phylogeny, there is a 3-way polytomy (trichotomy) composed of Mesonychia, _Andrewsarchus_ and the Cetacea+Artiodactyla clade. The hippopotamids are inside the crown Artiodactyla, in the Suina clade. Because the whales are recovered in a Cetacea-Raoellidae clade at the base of the Artiodactyla, cetaceans are *not* closer to hippos than to mesonychians. Not according to this phylogeny, anyway.

Yes they are. The existence of a "Cetacea+Artiodactyla clade" that excludes Mesonychia means that cetaceans are closer to hippos (as artiodactyls) than they are to mesonychians. It's just that, under Thewissen et al.'s phylogeny, cetaceans are not any closer to hippos than they are to llamas, babirusas, chevrotains, mule deer, okapis, etc., etc.

--Nick Pharris