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An early eubrachyuran (Malacostraca: Decapoda) from the Upper Triassic Snyder quarry, Petrified Forest Formation, north-central New Mexico

ASU Author/Contributor (non-ASU co-authors, if there are any, appear on document)
Andrew B. Heckert Ph.D., Assistant Professor of Geology (Creator)
Institution
Appalachian State University (ASU )
Web Site: http://www.library.appstate.edu/

Abstract: New Mexico Museum of Natural History and Science (NMMNH) locality L-3845 in the Petrified Forest Formation of the Chinle Group (Rio Arriba County, NM) yields nonmarine fossil vertebrates, invertebrates, and plants of Revueltian (early-mid Norian, ~218-210 Ma) age. We describe a 48 mm long by 19 mm wide decapod specimen (NMMNH P-29041) that originated in one of several fining-upward depositional sequences at the locality. The specimen is wide-bodied and short-tailed, unlike any of the known Triassic crustaceans, which are otherwise all of macrurous body plan (shrimp- or crayfish-like). This animal represents the firstdecapod from the Triassic of New Mexico, and is named Rioarribia schrami, n. gen. et. sp., and we place this specimen in the Eubrachyura incertae sedis. Previously, the oldest eubrachyurans were known from the Lower Jurassic, so R. schrami significantly extends the temporal range of the true crabs.

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Publication
Rinehart, L.F., Lucas, S.G., and Heckert, A.B., (2003) An early eubrachyuran (Malacostraca: Decapoda) from the Upper Triassic Snyder quarry, Petrified Forest Formation, north-central New Mexico: New Mexico Museum of Natural History and Science Bulletin 24 (Paleontology and Geology of the Upper Triassic (Revueltian) Snyder Quarry, New Mexico) p. 67-70. (ISSN 1524-4156) Archived in NC DOCKS with permission of the editor. The version of record is available at: http://econtent.unm.edu/
Language: English
Date: 2003