An Endemic Cephalopod Assemblage from the Lower Campanian (Late Cretaceous) Parras Shale, Western Coahuila, Mexico
作者： Christina Ifrim , Wolfgang Stinnesbeck , José Flores Ventura
DOI: 10.1666/12-123
关键词: Polyptychoceras 、 Geology 、 Endemism 、 Ecology 、 Paleontology 、 Baculites 、 Eutrephoceras 、 Ammonite 、 Menuites 、 Didymoceras 、 Scaphites
摘要: The cephalopods from Union y Progreso represent the first fossil assemblage described Parras Shale in Coahuila, Mexico. Pseudoschloenbachia (Pseudoschloenbachia) aff. P. (P.) mexicana (Renz, 1936), Baculites haresi Reeside, 1927, and Menabites (Delawarella) vanuxemi (Morton, 1830) have a geographically restricted occurrence. Didymoceras juv. sp., Menuites Polyptychoceras Pseudoxybeloceras (Parasolenoceras) Scaphites sp. ex gr. S. hippocrepis (DeKay, 1828) are represented by juveniles could not be determined to species level. Desmophyllites diphylloides (Forbes, 1846) is only long-ranging, cosmopolitan this assemblage. Three new described: Eutrephoceras irritilasi n. Hypophylloceras (Neophylloceras) arturoi Tetragonites silencioensis morphotype also inferred distinct. faunal composition of indicates late early Campanian age. This shows high degree endemism. causes for endemism currently unknown difficult assess. Nevertheless, generic ammonite suggests short-term endemic event.
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