Pachythrissops

Pachythrissops is an extinct genus of ray-finned fish. It contains two species, P. laevis from the Purbeckian of England and P. propterus from the Tithonian of Germany. A third species, P. vectensis, has been reassigned to the elopiform genus Arratiaelops.^[1] Pachythrissops is often regarded as one of the most primitive members of the order Ichthyodectiformes;^[2] however, a phylogenetic analysis by Cavin et al. (2013) placed it and the related genus Ascalabothrissops outside the group.^[3]

Pachythrissops Temporal range: Tithonian–Berriasian PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Pachythrissops propterus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Ichthyodectiformes (?)
Genus:	†Pachythrissops Woodward, 1919
Species[1]
†P. laevis Woodward, 1919 (Type) †P. propterus (Wagner, 1873)