Bulletin of the Mizunami Fossil Museum, no. 35 (2009), p. 51–69, 3 pls., 3 figs., 2 tables. 5 © 2009, Mizunami Fossil Museum Neogene Crustacea from Southeastern Mexico Francisco J. Vega1, Torrey Nyborg2, Marco A. Coutiño3, Jesús Solé1, and Oscar Hernández-Monzón4 Instituto de Geología, UNAM, Ciudad Universitaria, Coyoacán, México DF 04510, Mexico <
[email protected]> 2Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, California 92350 USA Museo de Paleontología ¨Eliseo Palacios Aguilera¨, Instituto de Historia Natural, Calzada de Los Hombres Ilustres s/n, Parque Madero, 29000, Tuxtla Gutiérrez, Chiapas, Mexico 4Facultad de Ciencias, UNAM, Ciudad Universitaria, Coyoacán, México DF, 04510, Mexico Abstract Thirteen species of crustaceans are described from Miocene and Pliocene sediments of Chiapas and Veracruz, Southeastern Mexico. 87Sr/86Sr isotopic analysis indicates that the age for the amber-bearing deposits near Simojovel, Chiapas is precisely at the Oligocene–Miocene time boundary. Crustaceans from these sediments are reported for the first time. The paleobiogeographic range for the genus Haydnella is extended to America. Paleobiogeographic affinities of the identified species indicate mainly a Caribbean influence, with one tethyan element. The high paleocarcinofauna biodiversity found in Chiapas is confirmed with this contribution. Key words: Miocene, Pliocene, Crustacea, Southeastern Mexico Resumen Se describen trece especies de crustáceos de sedimentos del Mioceno Inferior y Plioceno de Chiapas y Veracruz, sureste de México. Análisis isotópicos de 87Sr/86Sr indican que la edad de los sedimentos portadores de ámbar en el área de Simojovel, Chiapas, es precisamente la del límite Oligoceno–Mioceno. Crustáceos de éstos depósitos son reportados por vez primera.