Temporal range: Late Devonian-Mississippian
|Fossil of H. quebecensis in the Field Museum of Natural History, Chicago|
Holoptychius is an extinct genus of porolepiform lobe-finned fish from the Middle Devonian to Carboniferous (Mississippian) periods. It is known from fossils worldwide. The genus was first described by Louis Agassiz in 1839.
Holoptychius was streamlined predator about 50 centimetres (20 in) long (though largest specimen could grew up to 2.5 metres (8.2 ft)), which fed on other bony fish. Its rounded scales and body form indicate that it could have swum quickly through the water to catch prey. Similar to other rhipidistians, it had fang-like teeth on its palate in addition to smaller teeth on the jaws. Its asymmetrical tail sported a caudal fin on its lower end. To compensate for the downward push caused by this fin placement, the pectoral fins of Holoptychius were placed high on the body.
- H. americanus
- H. andersoni
- H. flemingi
- H. giganteus
- H. halli
- H. hopkinsii
- H. nobilissimus
- H. quebecensis
Fossils of Holoptychius have been found in the Mississippian of the United Kingdom and the Devonian of Belgium, Colombia (Cuche Formation, Boyacá), Norway, the Russian Federation, and the United States (Pennsylvania).
- Species Holoptychius
- Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 43. ISBN 1-84028-152-9.
- Holland, Timothy (2010). "Upper Devonian osteichthyan remains from the Genoa River, Victoria, Australia" (PDF). Memoirs of Museum Victoria. 67: 35–44. Retrieved 2017-04-04.
- Description Holoptychius
- Janvier & Villarroel, 1998
- Holoptychius at Fossilworks.org
|Wikimedia Commons has media related to Holoptychius.|
- Janvier, Philippe, and Carlos Villarroel A. 1998. Los Peces Devónicos del Macizo de Floresta (Boyacá, Colombia). Consideraciones taxonómicas, bioestratigráficas, biogeográficas y ambientales. Geología Colombiana 23. 3-18. Accessed 2017-03-31.
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