Gyrosteus

Gyrosteus is an extinct genus of ray-finned fish from the family Chondrosteidae that lived during the Lower Jurassic. It has a single species, G. mirabilis.

Gyrosteus Temporal range: Lower Toarcian 184–181 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Possible Bathonian record
Restoration of Gyrosteus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Chondrosteiformes
Family:	†Chondrosteidae
Genus:	†Gyrosteus Agassiz, 1843
Type species
†Gyrosteus mirabilis [1] Agassiz 1844
Species
†"Gyrosteus" subdeltoideus[2]

There could be a "second" species, G. subdeltoideus. However, not much data has been gathered on it, but it is known from otoliths.

Description

This large fish had a sturgeon-like body, reaching 6 metres (20 ft) to 7 metres (23 ft) long.

Specimens

Gyrosteus is only known from incomplete fossil specimens.