Boletín de la Sociedad Geológica Mexicana

Volumen 68, núm. 1, 2016, p. 93-103

Ophthalmoplax (Decapoda: Brachyura: Portunoidea) from the late Campanian, Upper Cretaceous, of Colombia

Walter Guzmán1, Hermann Darío Bermúdez1, Arley de Jesús Gómez-Cruz2, Francisco J. Vega3,*

1 Grupo de Investigación Paleoexplorer, Calle 98bis 71D-20 Bogotá D.C. Colombia.
2 Universidad de Caldas, Facultad de Ciencias, Departamento de Ciencias Geológicas, Calle 65 No. 26-10, Manizales, Caldas, Colombia.3 Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, 04510, CDMX, México.

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Abstract

A new species of the brachyuran Ophthalmoplax is documented based upon two specimens collected from shales of the Lodolitas de Aguacaliente Formation, Guadalupe Group, (Cordillera Oriental, Colombian Andes), which represents a regional transgressive event. The small crustaceans were found in the uppermost parasequences with retrogradational stacking pattern, near to the maximum flooding surface (MFS), at the end of the late Campanian Transgressive Systems Tract (TST). This is the oldest record for Ophthalmo plax in America. Morphological affinities with other species of the genus are discussed, including size reduction related with anoxia events and paleotemperature.

Keywords: Crustacea, Portunoidea, Ophthalmoplax andina n. sp., Campanian, anoxia, Colombia.


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