Osteology of Pentanogmius evolutus (Cope, 1877) n. comb. (Teleostei, Tselfatiiformes) from the marine Upper Cretaceous of the United States. Remarks on the systematics of the genus Pentanogmius Taverne, 2000
Taverne, L. (2004). Osteology of Pentanogmius evolutus (Cope, 1877) n. comb. (Teleostei, Tselfatiiformes) from the marine Upper Cretaceous of the United States. Remarks on the systematics of the genus Pentanogmius Taverne, 2000. Geodiversitas 26(1): 89-113
In: Geodiversitas. Publications Scientifiques Du Museum: Paris. ISSN 1280-9659; e-ISSN 1638-9395, more
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| Keywords |
Geological time > Phanerozoic > Geological time > Mesozoic > Cretaceous > Cretaceous, Upper
Actinopterygii [WoRMS]; Pentanogmius evolutus; Teleostei [WoRMS]; Tselfatiiformes
America, USA
Marine/Coastal |
| Author keywords |
Teleostei; Tselfatiiformes; Pentanogmius evolutus n. comb.; marine UpperCretaceous; United States; osteology; phylogenetic relationships |
| Abstract |
Osteology of Pentanogmius evolutus (Cope, 1877) n. comb. (Teleostei, Tselfatiiformes) from the marine Upper Cretaceous of the United States. Remarks on the systematics of the genus Pentanogmius Taverne, 2000. The study of the osteology of "Bananogmius" evolutus (Cope, 1877) has showed that this species does not share the two typical autapomorphies of the genus Bananogmius Whitley, 1940 (i.e. the long sharp ventro-posterior process of the antorbital and the toothless ectopterygoid), and so it can not be referred to it. It appears also different from this genus by numerous other characters : the low neurocranium, the long and sharp mesethmoid, the reduced lateral ethmoid, the small orbitosphenoid, the incomplete interorbital septum, the reduced fifth infraorbital, the premaxilla much longer than broad, the preoperculum with a short ventral branch, the reduced pelvic girdle and fins, the hemaxanal complex of type 3, the large lateral processes on the posterior dorsal radials, the numerous vertebrae, the loss of the preural 1 hemal arch, the loss of the sixth hypural and the presence of dermal scutes on the back. By its dermobasihyal pentagon-shaped, "B." evolutus clearly belongs to the genus Pentanogmius Taverne, 2000, a taxon still very imperfectly known but of which the only autapomorphy is precisely to have a pentagonal toothed dermobasihyal. Within the Tselfatiiformes, Pentanogmius is a derived genus. |
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