Search

Allain, Ronan, Vullo, Romain, Rozada, Lee, Anquetin, Jérémy, Bourgeais, Renaud, Goedert, Jean, Lasseron, Maxime, Martin, Jeremy E., Pérez-García, Adán, Fabrègues, Claire Peyre De, Royo-Torres, Rafael, Augier, Dominique, Bailly, Gilles (2022): Vertebrate paleobiodiversity of the Early Cretaceous (Berriasian) Angeac-Charente Lagerstätte (southwestern France): implications for continental faunal turnover at the J/K boundary. Geodiversitas 44 (25): 683-752, DOI: 10.5252/geodiversitas2022v44a25

Ionoscopiformes indet. (Fig. 8 E-G) DESCRIPTION Small, curved teeth with a pointed apex bearing two short, blunt carinae are assigned to an indeterminate ionoscopiform (Fig. 8 E-G). Small ganoid scales characterized by a finely serrated posterior margin may also belong to this group. Such a material is similar to that described from the Purbeckian beds of Chassiron (Vullo et al. 2014). As some recent studies suggest that Ionoscopiformes is not a monophyletic clade (Ebert2018; López-Arbarello & Sferco 2018), the material from Angeac-Charente is assigned to Ionoscopiformes sensu Grande & Bemis (1998)., Published as part of Allain, Ronan, Vullo, Romain, Rozada, Lee, Anquetin, Jérémy, Bourgeais, Renaud, Goedert, Jean, Lasseron, Maxime, Martin, Jeremy E., Pérez-García, Adán, Fabrègues, Claire Peyre De, Royo-Torres, Rafael, Augier, Dominique & Bailly, Gilles, 2022, Vertebrate paleobiodiversity of the Early Cretaceous (Berriasian) Angeac-Charente Lagerstätte (southwestern France): implications for continental faunal turnover at the J / K boundary, pp. 683-752 in Geodiversitas 44 (25) on page 694, DOI: 10.5252/geodiversitas2022v44a25, http://zenodo.org/record/6902033, {"references":["VULLO R., ABIT D., BALLEVRE M., BILLON- BRUYAT J. - P., BOURGEAIS R., BUFFETAUT E., DAVIERO- GOMEZ V., GARCIA G., GOMEZ B., MAZIN J. - M., MOREL S., NERAUDEAU D., POUECH J., RAGE J. - C., SCHNYDER J. & TONG H. 2014. - Palaeontology of the Purbeck-type (Tithonian, Late Jurassic) bonebeds of Chassiron (Oleron Island, western France). Comptes Rendus Palevol 13: 421 - 441. https: // doi. org / 10.1016 / j. crpv. 2014.03.003","EBERT M. 2018. - Cerinichthys koelblae, gen. et sp. nov., from the Upper Jurassic of Cerin, France, and its phylogenetic setting, leading to a reassessment of the phylogenetic relationships of Halecomorphi (Actinopterygii). Journal of Vertebrate Paleontology 38 (1): e 1420071. https: // doi. org / 10.1080 / 027 24634.2017. 1420071","LOPEZ- ARBARELLO A. & SFERCO E. 2018. - Neopterygian phylogeny: the merger assay. Royal Society Open Science 5: 172337. https: // doi. org / 10.1098 / rsos. 172337","GRANDE L. & BEMIS W. E. 1998. - A comprehensive phylogenetic study of amiid fishes (Amiidae) based on comparative skeletal anatomy. An empirical search for interconnected patterns of natural history. Journal of Vertebrate Paleontology 18 (suppl. 1): 1 - 696."]}

The extinct ray-finned fish taxonRobustichthys luopingensisfrom Luoping, eastern Yunnan, China represents the largest holostean known in the Middle Triassic. Despite its potential significance for investigating the holostean phylogeny and reconstructing the Triassic marine ecosystems,Robustichthyshas so far not been described in detail and its phylogenetic position within the Holostei was controversy. This study provides a redescription and revision ofRobustichthysbased upon a comparative study of eight type specimens and nine new specimens. Newly recognized information includes a toothed parasphenoid, a pair of premaxillae not pierced by the olfactory nerve, a splint-like quadratojugal, a hatchet-shaped hyomandibula, an hourglass-shaped symplectic, anterior and posterior ceratohyals, a complete series of branchiostegal rays, and sclerotic bones. A revised reconstruction ofRobustichthysis presented. Results of a cladistic analysis confirmedRobustichthysas an ionoscopiform within the Halecomorphi; the previous placements ofRobustichthysas a basal ginglymodian and Ionoscopidae as a basal amiiform clade are not supported. The sister group relationship between Sinamiinae (SinamiaandIkechaoamia) and Amiinae (AmiaandCyclurus) within the Amiidae is newly recognized. This revised topology provides new insights into the evolution and historical paleoecology of halecomorph fishes.