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Pentanogmius (Bananogmius) evolutus
Copyright © 2007-2008 by Mike Everhart Page created 05/29/2007 - Updated 05/23/2008
LEFT: Painting of Pentanogmius evolutus adapted from an original work (Plate 30) by Deb Bennett (1983) as published in Kansas Geology, Rex Buchanan (ed.), University of Kansas Press, 1983.
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Pentanogmius (Bananogmius) evolutus is featured in the National Geographic IMAX movie, Sea Monsters CLICK HERE
Pentanogmius evolutus (Cope) is one a diverse family of plethodids from the Late Cretaceous of Kansas. The remains of plethodids are a fairly common in the Smoky Hill Chalk. The family Plethodidae includes the genera: Pentanogmius (originally "Anogmius" evolutus, then Bananogmius), Niobrara, Zanclites, Luxilites, Syntegmodus, Bananogmius, Martinichthys, Thryptodus, and Plethodus. The species "Bananogmius evolutus" was recently removed from the genus Bananogmius and renamed Pentanogmius evolutus by Taverne).
Pentanogmius was a medium to large sized fish (4 to 6+ feet) with a narrow, but deep body (somewhat like a modern Angel fish) and jaws that had small, comb-like teeth. Most of the skeleton was bone and preserves well. A commonly found fossil is the palatine bone from the roof of the mouth. These have a pebbled surface that served as the base for hundreds of small, sharp teeth.
E.D. Cope originally named the genus "Anogmius" in 1877, but that genus name had already been used (e.g. pre-occupied).
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LEFT: The exhibit specimen of Bananogmius (Pentanogmius) evolutus (FHSM VP-2182) in the collection of the Sternberg Museum. Although not fully displayed in this photograph of the reconstruction, the fish had a large, sail-like dorsal fin. Detail of the anterior portion of the specimen, including scales is shown here. |
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LEFT: Bananogmius (Pentanogmius) evolutus FHSM VP-2117) from the Smoky Hill Chalk in the collection of the Sternberg Museum of Natural History. Collected by Marion Bonner. The caudal fin (tail) is reconstructed. A close up view of the skull is HERE. A view of the teeth on the lower jaw of another specimen is HERE. |
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LEFT: The oddly crushed skull of FHSM VP-2117. RIGHT: Close-up of one of the tooth bearing elements (left lower jaw?) of FHSM VP-2117 (note that teeth are missing). |
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LEFT: The skull of a large Bananogmius
(Pentanogmius?) evolutus - KUVP 27815 in left lateral view collected from
the Pierre Shale in 1971 by the Orville Bonner party. RIGHT: The type specimen of Bananogmius ellisensis, preserved uncrushed in an ironstone concretion from the Blue Hill Shale Member of the Carlile Shale, Ellis County, Kansas (Middle Turonian in age). |
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LEFT: KUVP 445 - Right lateral view of a large Bananogmius (Pentanogmius?) specimen collected from a concretion in the Fairport Chalk Member (Middle Turonian) of the Carlile Shale, Russell County, KS. A detailed view of the skull is here. |
Other Oceans of Kansas webpages on Late Cretaceous fish:
Field Guide to Sharks and Bony Fish of the Smoky Hill Chalk
Sharks:
Bony Fish
Plethodids:
Cope, E. D. 1877. On some new or little known reptiles and fishes of the Cretaceous No. 3 of Kansas. Proceedings of the American Philosophical Society 17(100): 176-181. (Anogmius and Stratodus)
Fielitz, C. and K. Shimada, 1999. A new species of Bananogmius (Teleostei; Tselfatiformes) from the Upper Cretaceous Carlile Shale of western Kansas. Journal of Paleontology 73(3): 504-511.
Loomis, F. B. 1900. Die anatomie und die verwandtschaft der Ganoid- und Knochen-fische aus der Kreide-Formation von Kansas, U.S.A. Palaeontographica, 46: 213-283.
Taverne, L. 2001. Révision du genre Bananogmius (Teleostei, Tselfatiiformes), poisson marin du Crétecé supérior d'Amérique du Nord et d'Europe. Geodiversitas 23(1):17-40. (Revision of the genus Bananogmius (Teleostei, Tselfatiiformes), marine fish from the Upper Cretaceous of North America and Europe).
Taverne, L. 2003. Redescription critique des genres Thryptodus, Pseudothryptodus et Paranogmius, poissons marins (Telostei, Tselfatiiformes) du Crétecé supérior des Etats-Unis d’ Egypte et de Libye. Belgian Journal of Zoology 133(2):163-173.
