| | Re: Segnosaurus relationship (Site not responding. Last check: 2007-10-25) |
 | | Metatarsal 4 is rudimentary compared to other Therizinosaurs, but he hasn't lost it yet, so that the later genera have this bone still. |
 | | Beipiaosaurus is from the early Cretaceous and Segnosaurus from the late Cretaceous, although Segnosaurus is in morphology more primitive than B. Both Beipiaosaurus and Segnosaurus have five metatarsals, like most theropods (Jibeinia + Ornithothoraces lost mtV, and derived ornithomimids and Avimimus lost mtI). |
 | | The fifth metatarsal of Beipiaosaurus isn't illustrated, but the authors say it is "slender and strap-like", being half the length of the main metatarsals. |
| dml.cmnh.org /2002Jan/msg00428.html (137 words) |