Semionotiform fish from the Upper Jurassic of Tendaguru (Tanzania)

Abstract

The late Late Jurassic fishes collected by the Tendaguru expeditions (1909)(1910)(1911)(1912)(1913) are represented only by a shark tooth and various specimens of the neopterygian Lepidotes . The Lepidotes is a new species characterized by a combination of features such as the presence of scattered tubercles in cranial bones of adults, smooth ganoid scales, two suborbital bones, one row of infraorbital bones, non-tritoral teeth, hyomandibula with an anteriorly expanded membranous outgrowth, two extrascapular bones, two postcleithra, and the absence of fringing fulcra on all fins.

Osteology and relationships of Thaiichthys nov. gen.: a Ginglymodi from the Late Jurassic – Early Cretaceous of Thailand

“…gloriae described by Thies (1989 a ), L . tendaguruensis described by Arratia and Schultze (1999), L. microrhis described by Wenz (2003) and L. piauhyensis described by Gallo (2005) among others. In 1991, Olsen and McCune restricted the family Semionotidae to the genus Semionotus and Lepidotes only.…”

A new hump-backed ginglymodian fish (Neopterygii, Semionotiformes) from the Upper Triassic Chinle Formation of southeastern Utah

“…Lophionotus sanjuanensis shares very few characteristics with taxa belonging to a monophyletic clade in the newly erected family Callipurbeckiidae (López-Arbarello, 2012), including the genera Tlayuamichin from the Early Cretaceous of Mexico (López-Arbarello and Alvarado-Ortega, 2011), Macrosemimimus from the Late Jurassic of Germany, England, and France (Schröder et al, 2012), and Callipurbeckia ('Lepidotes' minor, 'Lepidotes' notopterus, 'Lepidotes' tendaguruensis) from the Late Jurassic of Germany, England, and Tanzania (Agassiz, 1833;Arratia and Schultze, 1999;López-Arbarello, 2012). López-Arbarello (2012) placed Semiolepis and Paralepidotus in this family, but they are stem taxa and are not part of the clade represented by Macrosemimimus, Callipurbeckia, and Tlayuamichin.…”

The Tendaguru Formation (Late Jurassic to Early Cretaceous, southern Tanzania): definition, palaeoenvironments, and sequence stratigraphy

“…Significant vertebrate fossils recorded from the Upper Dinosaur Member include fishes (e.g. Hybodus sp., Lonchidion sp., Sphenodus sp., Engaibatis schultzei, and Lepidotes tendaguruensis; Hennig 1914c; Arratia & Schultze 1999;Arratia et al 2002), as yet unidentified sphenodontians (Aberhan et al 2002;Heinrich 2003), crocodiles (Bernissartia sp. ; Heinrich et al 2001;Aberhan et al 2002;Heinrich 2003), pterosaurs (Dsungaripteroidea indet., Rhamphorhynchoidea indet.…”