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Fossil Sirenia of the West Atlantic and Caribbean Region. IV. Corystosiren varguezi, gen. et sp. nov.

Daryl P. Domning
Journal of Vertebrate Paleontology
Vol. 10, No. 3 (Sep. 20, 1990), pp. 361-371
Stable URL: http://www.jstor.org/stable/4523331
Page Count: 11
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Fossil Sirenia of the West Atlantic and Caribbean Region. IV. Corystosiren varguezi, gen. et sp. nov.
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Abstract

Corystosiren varguezi, gen. et sp. nov. (Dugongidae: Rytiodontinae), is described on the basis of a skull from Yucatan, Mexico, and skull and tusk fragments from the Bone Valley district, Florida, USA. The age of this form is most probably early Pliocene, but it appears to be the sister taxon of the early Miocene Rytiodus Lartet, 1866, from France and Libya. Both had strongly deflected rostra and very large, flattened, self-sharpening tusks. Corystosiren is additionally distinguished by a broad and extremely thick skull roof. An unnamed Miocene taxon from South Carolina may be phylogenetically intermediate between C. varguezi and other rytiodontines. /// Corystosiren varguezi, gen. et sp. nov. (Dugongidae: Rytiodontinae), se describe en base a un cráneo de Yucatán, México, y fragmentos de cráneo e incisivo encontrados en la zona de Bone Valley, Florida, EE.UU. La edad de esta especie es probablemente Plioceno inferior, pero pareceria ser el pariente mas cercano a Rytiodus Lartet, 1866, del Mioceno inferior de Francia y Libia. Ambos tenian hocicos muy inclinados hacia abajo e incisivos muy grandes y aplanados, que el constante crecimiento y uso mantenía afilados. Corystosiren se distingue adicionalmente por la calota que es muy ancha y extremadamente gruesa. Una especie no nominada de South Carolina puede ser la especie intermedia entre C. varguezi y otros rytiodontines.

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