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Temporal range: Moscovian 311.7–306.5 Ma
Eogyrinus BW.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia sensu lato
(unranked): Reptiliomorpha
Order: Anthracosauria
Suborder: Embolomeri
Family: Eogyrinidae
Watson, 1929
Genus: Eogyrinus
Watson, 1926

Eogyrinus attheyi (from Greek eos, meaning "dawn", and gyrinos, meaning "tadpole")[1] was one of the largest Carboniferous tetrapods, and perhaps one of the largest of its family, Eogyrinidae, at 4.6 metres (15 ft) in length.[2]

Eogyrinus appears to have been a powerful swimmer that moved quickly through the water by moving its long tail from side to side. It may have been a predator, lying in wait for prey in much the same way as a modern crocodile. It was a lightly built animal, weighing around 560 kilograms (1,230 lb).[citation needed]

Fossils of Eogyrinus are known from northern England.[2]

Recent studies by Jennifer A. Clack suggest that the amphibian Pholiderpeton described by Thomas Henry Huxley in 1869 is the same animal as Eogyrinus. If this is so, then Pholiderpeton's name takes priority.


  1. ^ Panchen, A. L. (10 February 1972). "The skull and skeleton of Eogyrinus attheyi Watson (Amphibia: Labyrinthodontia)". Phil. Trans. R. Soc. Lond. B. 263 (851): 279–326. doi:10.1098/rstb.1972.0002. ISSN 0080-4622.
  2. ^ a b Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 53. ISBN 1-84028-152-9.