The trematosaurs were a diverse and important group that included many medium-sized to large forms that were semi-aquatic to fully aquatic. The group included long-snouted forms such as the trematosauroids and short, broad-headed forms such as the metoposaurs.
Trematosaurs represented an extensive and important biological category that contained a variety of mid-to-large-size creatures capable of being semi-aquatic or fully aquatic. This group included long-snouted forms such as the trematosauroids and shorter, broader-headed types like the metoposaurs.