Chelus fimbriata (Schneider 1783) – Matamata Turtle.
Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group. A.G.J. Rhodin, P.C.H. Pritchard, P.P. van Dijk, R.A. Saumure, K.A. Buhlmann, and J.B. Iverson, Eds. - Chelonian Research Monographs (ISSN 1088-7105) No. 5, doi:10.3854/crm.5.020.fimbriata.v1.2008
© 2008 by Chelonian Research Foundation. Published 4 August 2008
Chelus fimbriata, the matamata turtle (Family Chelidae), is the largest member of its pleurodiran family, and is surely the most bizarre turtle in the world. It has an exceedingly rough, tuberculate carapace, a greatly elongated and thickened neck, and a wide, triangular, extremely flattened head, with a tubular nasal extension, reduced anteriorly displaced eyes, and an extremely wide mouth. It is specialized for feeding upon live fish that it sweeps into its mouth by a rapid lateral strike of the neck and jaws, and a vigorous simultaneous expansion of the hyoid apparatus in the neck. It is distributed widely in South America, and currently does not appear to be threatened significantly anywhere in its range.