Browsing by Subject "Eomyidae"
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Item Early Tertiary Vertebrate Faunas Vieja Group Trans-Pecos Texas: Rodentia(Texas Memorial Museum, The University of Texas at Austin, 1974-04) Wood, Albert E.The fossil rodents of the late Eocene to early Oligocene Vieja Group are described. They include the paramyids Leptotomus leptodus, L. gigans n. sp., Mytonomys gaitania, Microparamys perjossus n. sp., Ischyrotomus cf, petersoni and Manitsha johanniculi n. sp.; the ischyromyids Ischyromys blacki n. sp, and Titanotheriomys veterior; the cylindrodonts Cylindrodon fontis, Pseudocylindrodon neglectus, P. texanus n. sp., Ardynomys occidentalis, Jaywilsonomyinae n. subf., Jaywilsonomys ojinagaensis and /. pintoensis; the eomyids Adjidaumo cf. minutus, Viejadjidaumo magniscopuli n. gen., n. sp., Aulolithomys bounites, Meliakrouniomys wilsoni and Yoderimys lustrorum n. sp.; the eutypomyid Eutypomys inexpectatus n. sp.; the possible zapodid cf. Simimys sp. indet., and the possible cricetid Subsumus candelariae n. gen., n. sp. Skulls are described for Pseudocylindrodon texanus, Viejadjidaumo magniscopuli and Yoderimys lustrorum, and partial ones for Ischyromys blacki, Titanotheriomys veterior, Jaywilsonomys ojinagaensis, Aulolithomys bounites and Eutypomys inexpectatus. The Vieja fossils help to close the gap between late Eocene and Early Oligocene North American rodent faunules.Item A New Genus of Eomyid Rodent from the Ogliocene Ash Spring Local Fauna of Trans-Pecos Texas(Texas Memorial Museum, The University of Texas at Austin, 1969-02) Harris, John M.; Wood, Albert E.This paper describes a new genus and species of eomyid rodent, Meliakrouniomijs tcilsoni, from the Ash Spring local fauna, the latest vertebrate faunule from the Vieja Group of Trans-Pecos Texas. The teeth indicate that it is an eomyid rodent in process of tooth pattern simplification. Resemblances in tooth pattern and jaw structure to heteromyids and eomyids suggest that Meliakrouniomys may represent a transitional stage between the two families.Item Prolapsus, A Large Sciuravid Rodent: And New Eomyids From the Late Eocene of Trans-Pecos Texas(Texas Memorial Museum, The University of Texas at Austin, 1991-09) Wilson, John Andrew; Runkel, Anthony C.The questionably hystricognathous and hystricomorphous rodent Prolapsus is assigned, on the basis of its dental characters, to the Family Sciuravidae. The complete dentition of Prolapsus sibilamoris is now known but P. junctionis is still represented by isolated teeth only. Prolapsus sp. of Wood(1973) is now identified as a species of Pauronys. Prolapsus is found in the early Uintan Whistler Squat local fauna and late Uintan Serendipity local fauna at several localities in Trans-Pecos Texas and is closely related to a new emoyid genus, Aguafriamys, here described, that occurs in sediments of Duchesnean age in the same area. If Prolapsus is interpreted as being truly hystricognathous it follows that this character has evolved more than once. A new species of Yoderimys is described from the Coffee Cup local fauna Chadronian age.