Eosemionotus ceresiensis Bürgin 2004

By oilshale (edited)

• October 26, 2018

Taxonomy

Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Semionotiformes Arambourg & Bertin 1958
Family: Eosemionotidae Bürgin et al., 1991
Genus: Eosemionotus
Species: Eosemionotus ceresiensis
Author Citation Bürgin 2004

Geological Time Scale

Eon: Phanerozoic
Era: Mesozoic
Period: Triassic
Sub Period: None
Epoch: Middle
International Age: Ladinian

Stratigraphy

Prosanto Formation

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 4.5 cm

Location

Silvretta Nappe
Davos
Canton of Graubünden
Switzerland

• davos
• eosemionotus
• graubuenden
• ladinian
• prosanto
• switzerland
• tff-oilshale-ch1769
• triassic

Comments

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