An Early Eubrachyuran (malacostraca: Decapoda) from the Upper Triassic Snyder Quarry, Petrified Forest Formation, North-central New Mexico
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چکیده
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 (shrimpor crayfish-like). This animal represents the first decapod 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.
منابع مشابه
The Microvertebrate Fauna of the Upper Triassic (revueltian) Snyder Quarry, North-central New Mexico
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