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Richardoestesia
''Richardoestesia'' is a medium-sized (~100 kg) genus of theropod dinosaur from the late Cretaceous Period of what is now North America. It currently contains two species, ''R. gilmorei'' and ''R. isosceles''.
==Species==
The holotype specimen of ''Richardoestesia gilmorei'' (NMC 343) consists of the pair of lower jaws found in the upper Judith River Group, dating from the Campanian age, about 75 million years ago. The jaws are slender and rather long, 193 millimeter, but the teeth are small and very finely serrated with five to six denticles per millimeter. The serration density is a distinctive trait of the species.
In 2001, Julia Sankey named a second species: ''Richardoestesia isosceles'', based on a tooth, LSUMGS 489:6238, from the Texan Aguja Formation, which is of a longer and less recurved type.〔J.T. Sankey, 2001, "Late Campanian southern dinosaurs, Aguja Formation, Big Bend, Texas", ''Journal of Paleontology'' 75(1): 208-215〕 The teeth of ''R. isosceles'' have also been identified as crocodyliform in shape, possibly belonging to a sebecosuchian.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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