Bulletin of the Mizunami Fossil Museum, no. 42 (2016), p. 1–22, 11 fi gs., 3 tables. © 2016, Mizunami Fossil Museum Early Cretaceous (Albian) decapods from the Glen Rose and Walnut formations of Texas, USA Carrie E. Schweitzer*, Rodney M. Feldmann**, William L. Rader***, and Ovidiu Fran㶥escu**** *Department of Geology, Kent State University at Stark, 6000 Frank Ave. NW, North Canton, OH 44720 USA <
[email protected]> **Department of Geology, Kent State University, Kent, OH 44242 USA ***8210 Bent Tree Road, #219, Austin, TX 78759 USA ****Division of Physical and Computational Sciences, University of Pittsburgh Bradford, Bradford, PA 16701 USA Abstract Early Cretaceous (Albian) decapod crustaceans from the Glen Rose Limestone and the Walnut Formation include the new taxa Palaeodromites xestos new species, Rosadromites texensis new genus, new species, Karyosia apicava new genus new species, Aetocarcinus new genus, Aetocarcinus muricatus new species, and the new combinations Aetocarcinus roddai (Bishop, 1983), Necrocarcinus pawpawensis (Rathbun, 1935) and Necrocarcinus hodgesi (Bishop, 1983). These two formations have yielded a much less diverse decapod fauna than the nearly coeval and proximally deposited Pawpaw Formation. Paleoenvironment is suggested as a controlling factor in the decapod diversity of these units. Key words: Brachyura, Nephropidae, Dromiacea, Raninoida, Etyioidea, North America Introduction deposited in the shallow waters of a broad carbonate platform. Deposition occurred on the southeastern flank of Late Early Cretaceous decapod faunas from the Gulf the Llano Uplift and, on the seaward margin to the Coastal Plain of North America have been well reported northwest, behind the Stuart City Reef Trend. Coral and and described since the early part of the twentieth century rudist reefs, algal beds, extensive ripple marks, evaporites, (Rathbun, 1935; Stenzel, 1945).