In my continued quest to betray my dinosaurian research roots, I went to the American Museum of Natural History in New York to look at turtles! And what turtles they were – this is the skull of Ninjemys (the ninja turtle!), a giant meiolaniid turtle from Australia. Meiolaniids are the best turtles you’ve never heard of and it’s a crying shame that they don’t feature more prominently in prehistoric popular media.
Meiolaniids are basically ankylosaur-convergent turtles, all of which are very large for turtles and some, like Ninjemys, which would have been legitimately huge. They are only found in the southern hemisphere (and really mostly in Australia and nearby), and they all have elaborate cranial ornamentation. On the left in this picture is that same Ninjemys skull cast, and on the right we have Niolamia from Argentina – smaller, but arguably even weirder with those huge nuchal crests flaring off the back of the skull.
I’m interested in meiolaniids at the moment because they are one of the other groups of tetrapods that evolved a club-like tail weapon. Here’s Meiolania platyceps, an island dwarf (!) meiolaniid, with some kind of boring mammal for scale.
And here’s the business end of Meiolania. Stay tuned for more exciting discussion of animal business ends in the future!
Since we’re looking at animal butts today, apparently, here are some Edmontosaurus rears…
…and a Triceratops derriere, for good measure.
Elsewhere in the fossil halls, I enjoyed meeting the disembodied floating head of this indricothere, which makes for a nice counterpoint to the fleshed-out model currently on exhibit at the North Carolina Museum of Natural Science’s feature exhibit Extreme Mammals.
And here’s a lovely trio of cingulates! The big fellow is the derived glyptodont Panochthus, the medium-sized fellow is the early glyptodont Propalaeohoplophorus, and off towards the back the little guy is the extant six-banded armadillo, Euphractus sexcinctus. The tail club on the Panochthus is mounted really weirdly, with it sticking straight out from the back of the shell rather than having any of the mobile rings from the base of the tail present, so I’m not sure what’s quite up with that.
I post woefully few fish fossils on this blog, so here’s a pretty great semionotid!
Science and anatomy and zoology are all around us if you keep your eyes open! I loved this chameleon logo on the side of a restaurant we came across one evening.