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New Material of Sebecus cf. huilensis (Crocodilia: Sebecosuchidae) from the Miocene La Venta Formation of Colombia

Arthur B. Busbey III
Journal of Vertebrate Paleontology
Vol. 6, No. 1 (Mar. 7, 1986), pp. 20-27
Stable URL: http://www.jstor.org/stable/4523070
Page Count: 8
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New Material of Sebecus cf. huilensis (Crocodilia: Sebecosuchidae) from the Miocene La Venta Formation of Colombia
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Abstract

Sebecus huilensis, an advanced sebecosuchian crocodilian, was first described by Langston (1965) based on a fragmentary lower jaw from the Miocene La Venta Formation of Colombia. New skeletal fragments from the same unit are referable to S. cf. huilensis and add to our knowledge of sebecosuchian cranial and postcranial anatomy. These fragments indicate that the skull was more laterally compressed than that of the Eocene S. icaeorhinus (based on comparison with the type of the latter). S. cf. huilensis is the first sebecosuchian for which a complete retroarticular process is known. The posterior portion of the retroarticular process is unlike that of any known crocodilian, with a ventral deflection of the medial edge, indicating significant changes in muscle size. A single, unusual osteoscute also may be referred to this animal, suggesting that sebecosuchians had some dermal osteoscutes. Comparison with the type of S. huilensis also suggests that Buffetaut and Hoffstetter (1977) may have been in error in assigning a Miocene Peruvian sebecosuchian to this species.

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