Eusemius

Eusemius is an extinct genus of prehistoric marine ray-finned fish, previously described as a macrosemiid, that lived during the Late Jurassic. It contains a single species, E. beatae, from the Tithonian-aged Eichstätt Formation of Germany.^[1][2] It is known from a single very small specimen, likely a juvenile, that is likely now lost.^[3] It closely resembles the co-occurring Ophiopsis and Ophiopsiella (which are now classified in the Ionoscopiformes), only differing in the non-bifurcated dorsal fin rays.^[4][5]

Eusemius Temporal range: Early Tithonian[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Clade:	Halecomorphi
Genus:	†Eusemius Vetter, 1881
Species:	†E. beatae
Binomial name
†Eusemius beatae Vetter, 1881

See also

• Prehistoric fish
• List of prehistoric bony fish