Piscae and Actinopteria, Water 2 ancestor Pokemon

This is a fun idea where I try to design hypothetical common ancestors to a bunch of Pokemon, based on in-game egg groups. Here is my imagined ancestors for the Water 2 group, which mostly consist of fish Pokemon. Piscae Actinopteria is a two-stage evolution representing the ancestor of most fish and shark Pokemon, and Piscae Prota is the ancestor to the whole group.