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Taxonomy from Fossilworks.org. Diagnosis (emended from Bürgin 1992): "Small fusiform fish of up to 50 mm in standard length (s.l.); single row of highly deepened scales, bearing the lateral line, occupying the whole flank and ending with a large semicircular one; frontals, parietals and dermopterotics fused in a single shield-like bone; maxilla shorter than mandible and free from the pear-like preopercle; no teeth; opercle much larger than subopercle; suborbitals absent; large and stout triangular dermosphenotic; clavicle present; tail slightly asymmetrical, with a very small body lobe supporting few epaxial rays; all fins lacking fringing fulcra." Reconstruction: References: Brough J. (1939), The Triassic fishes of Besano, Lombardy, 1-117. Bürgin, T. (1990). The dermal body armor of Habroichthys minimus, an unusual ray-finned fish (Actinopterygii; Peltopleuriformes) from the Middle Triassic of the Southern Alps. Neues Jahrbuch für Geologie und Paläontologie-Monatshefte, pp. 647-658. Bürgin T., Eichenberger U., et al (1991) Die Prosanto Formation - eine fischreiche Fossil-Lagerstätte in der Mitteltrias der Silvretta-Decke (Kanton Graubünden, Schweiz), Eclogae Geologicae Helvetiae 84, 921-990. Bürgin T. (1992) Basal ray-finned fishes (Osteichthyes; Actinopterygii) from the Middle Triassic of Monte San Giorgio (Canton Tessin, Switzerland), Schweizerische Paläontologische Abhandlungen 114, 1-164.

The Prosanto Fm. is a (Furrer et al. 1985) " Small lagoonal basin [pool] in the intertidal platform of the Vallatscha Fm. with anoxic bottom waters. Agitated surface waters deposit tempestite layers as well as mud, which forms very regular drapes." Taxonomy from Bürgin 2004. Diagnosis (Bürgin 2004, p, 242): "A fusiform species of the genus tEosemionotus with a broad gill-cover, being one and a half times deeper than wide. Supratemporal commissure not continuous. Fringing fulcra on dorsal and anal fin minute. Twenty-seven or 28 vertical scale rows and 12-14 single scales in the row in front of dorsal fin. Flank scales moderately deepened and with a smooth posterior margin." Line drawing from Bürgin 2004, p. 246: Identified by oilshale using Bürgin 2004. References: T. Buergin et al. (1991) The Prosanto Formation - a middle Triassic fossil Lagerstatte of the Silvretta Nappe (Graubünden Canton, Switzerland) with a rich ichthyofauna. Eclogae Geologicae Helvetiae 84(3):921-990. Bürgin, T. (2004) Eosemionotus ceresiensis sp. nov., a new semionotiform fish (Actinopterygii, Halecostomi) from the Middle Triassic of Monte San Giorgio (Southern Switzerland). In: Mesozoic Fishes 3 - Systematics, Paleoenvironments and Biodiversity, G. Arratia & A. Tintori (eds.): pp. 239-251, 10 figs. ©2004 by Verlag Dr. Friedrich Pfeil, München Germany - ISBN 3-89967-053—8. López-Arbarello, A., Bürgin, T., Furrer, H., and Stockar, R. (2019) Taxonomy and phylogeny of Eosemionotus Stolley, 1920 (Neopterygii: Ginglymodi) from the Middle Triassic of Europe. Palaeontologia Electronica 22.1.10A 1-64. https://doi.org/ 10.26879/904 palaeo-electronica.org/content/2019/2383-systematics-of-eosemionotus