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''Orthogonikleithrus'' is a genus of extinct
The
ray-finned fish
Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species.
The ray-finned fishes are so called because their fins are webs of skin supported by bony or hor ...
that lived during the Late Jurassic period. It lived in lagoonal and restricted shallow subtidal zones.
Discovery and naming
The type specimen
In biology, a type is a particular wiktionary:en:specimen, specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally attached. In other words, a type is an example that serves to a ...
''Orthogonikleithrus leichi'' was described by G. Arratia in 1987, placing it into the Orthogonikleithridae family.Arratia G. 1987. Anaethalion and similar teleosts (Actinopterygii, Pisces) from the Late Jurassic (Tithonian) of southern Germany and their relationships. Palaeontographica, A 200: 1–44.
Another species, ''Orthogonikleithrus francogalliensis'' was described and assigned to this genus in 2016. It was discovered in Cerin (Ain, France). These specimens were collected during excavations in Cerin by the Université Claude Bernard
Claude Bernard University Lyon 1 (french: link=no, Université Claude-Bernard Lyon 1, UCBL) is one of the three public universities of Lyon, France. It is named after the French physiologist Claude Bernard and specialises in science and technol ...
, Lyon. The fish were not immediately identified as new taxa, and were only assigned during a study on the temporal and spatial distribution of orthogonikleithrid fishes. The new species is superficially similar to ''Orthogonikleithrus hoelli'' but differs in several anatomical features, such as the presence of teeth, the number of tubules in the cephalic lateral line system, and the number of hypurals and uroneurals. Due to the record of the genus Orthogonikleithrus in Cerin, the known spatial distribution of this genus was extended, as it formerly was only known from remains in Zandt and Ettling, both in Bavaria
Bavaria ( ; ), officially the Free State of Bavaria (german: Freistaat Bayern, link=no ), is a state in the south-east of Germany. With an area of , Bavaria is the largest German state by land area, comprising roughly a fifth of the total lan ...
, Germany.
References
Prehistoric ray-finned fish genera Late Jurassic bony fish Late Jurassic fish of Europe {{Jurassic-fish-stub