Abstract
We describe a new semionotiform fish, Tlayuamichin itztli gen. et sp. nov. from the Early Cretaceous (Albian) of Mexico, which constitutes one of the youngest semionotid articulated remains. The new taxon is represented by five well-preserved specimens from the Tlayúa Quarry near Tepexi de Rodríguez in Puebla State, central Mexico. A series of paraethmoid bones anterior to the supraorbital series, supraorbital bones extending beyond the anterior rim of the orbit, the presence of a large pentagonal supraorbital closing the anterior rim of the orbit, seven anterior infraorbitals, dorsally expanded infraorbitals at the ventral border of the orbit, and the most dorsal suborbital separating the preoperculum from the dermopterotic are potential autapomorphic features of the new taxon. The very long frontals, a dermopterotic that does not contact the anterodorsal corner of the operculum and the presence of a modified pectoral scale are additional features that help to diagnose the taxon. Tlayuamichin itztli gen. et sp. nov. resembles most closely “Lepidotes” minor from the Middle Purbeck Beds (early Berriasian), England. These two taxa share similarity with other species of Semionotus from the Early Jurassic of North America and the Triassic of Europe, suggesting interesting biogeographic relationships.References
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