Abstract
Around the city of Tuxtla Gutierrez, the capital of Chiapas, which is the southern most state of Mexico,there are several fossiliferous localities with Upper Cretaceous rudists from which derived the specimens studied in this paper. It is described and proposed as a new species Antillocaprina trilobata, characterized by three prominent longitudinal ridges in the ventral region. It is also described Coralliochama gbohemi Bose; this is the first record of the two genera in Chiapas. The fossils were found in the upper part of the Angostura Formation of late Campanian-Maastrichtian age. The Maastritchian age of the described species is established by the associated rudists Titonosarcolites giganteus ( Whitfield) and Macgillavryia nicholasi ( Whitfield), and this age is confirmed by the occurrence of the large foraminifers Chubbina jamaicensis Robinson, Kathina jamaicensis ( Cushman & Jarvis), Smoutina cruysi Drooger, Sulcoperculina vermunti ( Thiadens), S. dikersoni ( Palmer), S. globosa De Cizancourt and Rhapydionina sp.
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