Blue Surgée

Back on Earth, the seeming similarity between sharks and the bony fish known as strugeons was purely superficial and the result of convergent evolution. 

Semantics aside, because Eryobis has a small dozen of different fish groups that are referred to as "sharks" by explorers, the Eryobian equivalent of sturgeons do belong to these "shark" like groups. In fact, it has recently been revealed that the highly derived coelacants often called coeaaien, belong to one of two differernt groups that split long ago before either evolved to look similar to sharks. These groups became the Odontocoeiida, the "toothed coeaaien", and the Lamidocoeiida, the "plated coeaaien". Curiously, the apparent sturgeon equivalents of Eryobis were also part of this split and now it seems that most of the armoured ones belong to the Odontocoeiida while the less armoured or armourless ones belong to the Lamidocoeiida.

One of the most common sturgeon equivalents along the northern Riatic coasts of Guralta and the southern coasts of Tlèëa is the blue surgée (Riatelops caerulus), a 3 to 4 meter long armourless sturgeon equivalent Lamidocoeiidan, specifically of the family Eryosturiidae.

A medium sized surgée, the blue surgée typically stays close to the seafloor and is often found relatively close to the shore. Unlike many other surgées, this species does not seem to venture into freshwater, instead spending its entire life in the sea.

They have downturned mouths at the end of their rather elongated heads and weak jaws that instead of teeth, possess large plates used to crush hard shelled organisms. Indeed, most their diet consists of various benthic mollusks and crustaceans, though small demersal fish are also ingested on occasion.

Despite surgées often being called armourless, they are not exactly defenseless. Their large size makes sure that they are not frequently preyed upon by predatory fish and they possess a long, extremely sharp spine on at the base of their first dorsal fin which, although no evidence has been presented as of yet, its rumoured to be venomous.