This animal is very poorly known, but is most likely some sort of primitive reptile.

The vertebrae of the group foreshadowed that of primitive reptiles, with small pleurocentra, which grew and fused to become the true centrum in later vertebrates.

Seymouria was well adapted to life on land, with many reptilian features-so many, in fact, that it was first thought to be a primitive reptile.

A primitive reptile on some small islands in the New Zealand area exists even today with such a "pineal eye" almost functional.

Pachypleurosaurs were primitive sauropterygian reptiles that vaguely resembled aquatic lizards, and were limited to the Triassic period.

But, Dr Booth adds, "this study tells us we have much more to learn when it comes to reproduction in these primitive reptiles".

The depression of erythrosuchids is a remnant of the pineal foramen that was present in more primitive reptiles.

The pisiform bone is somewhat unusual, in that it first appears in primitive reptiles, and is never found in amphibians.

It was a quite generalized primitive reptile, in many ways resembling their amphibian ancestors.

Many genera of primitive reptiles were thought to be protorothyridids.