Glowogg

The glowogg split from its ancestor the migrating glowsnapper. It has shrank in size and now eats exclusively flashkelps. Like its ancestor it starts out as a frog-like egg in the water and then hatches into tiny tadpole-like creatures. There it feeds on small flashkelps until it matures into its adult form.

In the adult form they develop its signature bioluminescent markings on the sides of its body. These are to help attract mates. In addition its back shell is now hollow and semi transparent. It stores some of the flashekelps it eats in there when trying attract a mate. This glowing eventually fades out as the flashkelps die. Once dead they are then digested as food.

They are now nocturnal and have grown larger eyes not only to look out for predators but to see their mates better. Males generally have larger shells however both will glow at each other with different flashes. They are deaf so the eerie mating ritual is mostly silent with the occasional splashing. During the day they hide out in burrows they make on the river banks.