Diving just around the openings of the dry caverns you can find the Seasnatchers (Telomin Aquentis), these creatures are the close relatives of the Coastsnatcher (Teodelustus), but unlike their relatives, Seasnatcher still has gills and no lungs. But they have some things in common, like their two fins (that by the Coastsnatchers evolved into arms), a tail (that by the Coastsnatchers evolved into a third limb) and almost the same head.
Click for call They lived in the Terrial era NOTE: this the not the direct ancestor of the Coastsnatchers.