{{Short description|Extinct genus of fishes}} {{Speciesbox | fossil_range = {{fossilrange|149.2|146.3|Early Tithonian<ref name="sepkoskidb">{{cite journal|last=Sepkoski |first=Jack |title=A compendium of fossil marine animal genera |journal=Bulletins of American Paleontology |volume=364 |page=560 |year=2002 |url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class |access-date=2009-02-27 |archive-url=https://web.archive.org/web/20110723131237/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class |archive-date=July 23, 2011 }}</ref>}} | taxon = Eusemius beatae | authority = Vetter, 1881 | parent_authority = Vetter, 1881 }}
'''''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.<ref name="sepkoskidb"/><ref>{{Cite web |title=PBDB Taxon |url=https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=35198 |access-date=2025-03-04 |website=paleobiodb.org}}</ref> It is known from a single very small specimen, likely a juvenile, that is likely now lost.<ref>{{Cite journal |last=Lambers |first=Paul H. |date=1999-06-01 |title=The actinopterygian fish fauna of the Late Kimmeridgian and Early Tithonian 'Plattenkalke' near Solnhofen (Bavaria, Germany): state of the art |url=https://link.springer.com/article/10.1023/A:1003855831015 |journal=Geologie en Mijnbouw |language=en |volume=78 |issue=2 |pages=215–229 |doi=10.1023/A:1003855831015 |issn=1573-9708}}</ref> 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.<ref>{{Cite book |last=Woodward |first=Arthur Smith |url=https://www.google.com/books/edition/Catalogue_of_the_Fossil_Fishes_in_the_Br/ssngSQEhXd4C? |title=Catalogue of the Fossil Fishes in the British Museum (Natural History) |date=1895 |publisher=Taylor & Francis |language=en}}</ref><ref>{{Cite journal |last=Lane |first=Jennifer A. |last2=Ebert |first2=Martin |date=2015-01-02 |title=A taxonomic reassessment of Ophiopsis (Halecomorphi, Ionoscopiformes), with a revision of Upper Jurassic species from the Solnhofen Archipelago, and a new genus of Ophiopsidae |url=https://www.tandfonline.com/doi/abs/10.1080/02724634.2014.883238 |journal=Journal of Vertebrate Paleontology |volume=35 |issue=1 |article-number=e883238 |doi=10.1080/02724634.2014.883238 |issn=0272-4634|url-access=subscription }}</ref>
==See also== * Prehistoric fish * List of prehistoric bony fish
==References== {{Reflist}}
{{Taxonbar|from=Q5414260}}
{{amiiformes-stub}} {{Jurassic-fish-stub}} Category:Monotypic prehistoric ray-finned fish genera Category:Halecomorphi Category:Late Jurassic fish of Europe Category:Late Jurassic bony fish Category:Tithonian genera Category:Fossil taxa described in 1881 Category:Solnhofen fauna