| Only mesosaurs and araeoscelidians demonstrate more lightly built limbs than protorothyridids. |
| He is of a generation sufficiently divorced from the old pulps that he's the dolphin among mesosaurs here. |
| There are also the fossils of marine reptiles such as mesosaurs, ichthyosaurs and mosasaurs. |
| The most basal anapsids, the mesosaurs, are oldest known fully aquatic reptiles. |
