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Freshwater Ostracodes from Late Triassic Coprolite in Central India
I. G. Sohn and S. Chatterjee
Journal of Paleontology
Vol. 53, No. 3 (May, 1979), pp. 578-586
Published by: SEPM Society for Sedimentary Geology
Stable URL: http://www.jstor.org/stable/1303999
Page Count: 9
You can always find the topics here!Topics: Vertebrates, Fossils, Fresh water, Continents, Geology, Paleontology, Plate tectonics, Smooth surfaces, Exoskeletons, Geological surveys
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Freshwater ostracodes are present in a presumably reptilian coprolite collected in the Upper Triassic Maleri Formation, of the continental Gondwana Group of central India. The ostracodes belong to the families Darwinulacea and ?Cytheracea, and because of poor preservation they are discussed and illustrated in open nomenclature. These ostracodes suggest, as do vertebrate fossils, that India had closer connections with Eurasia than with the southern continents (Africa, Australia, Antarctica) during Late Triassic time. India did not drift as an island continent from the Permian to the Late Cretaceous because no endemic family of ostracodes or tetrapods is known from this subcontinent, and those vertebrates that are not cosmopolitan are most nearly similar to North American and Eurasian forms. The genus Darwinula, whose stratigraphic range is Pennsylvanian through Holocene, has not been reported from Australia, and the fossil vertebrates show least similarities with Australian and Antarctic forms. The available record does not support the plate tectonic models showing that the eastern margin of India was connected with Australia or Antarctica. The ultrastructure of the shell of Darwinula stevensoni (Brady and Robertson, 1870), the type-species of the nominate genus of the superfamily, is illustrated for the first time to show that it differs from the presently known ultrastructure of the cypridacean Cypridopdis vidua (Müller, 1776).
Journal of Paleontology © 1979 SEPM Society for Sedimentary Geology