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<==o Urotrygon Gill, 1863 ()? [10] |-- U. mundus Gill, 1863 |-- U. chilensis (Gunther, 1871) |-- U. aspidurus (Jordan & Gilbert, 1883) |-- U. asterias (Jordan & Gilbert, 1883) |-- U. rogersi (Jordan & Starks, 1895) |-- U. microphthalmum Delsman, 1941 |-- U. venezuelae Schultz, 1949 |-- U. nana Miyake & McEachran, 1988 |-- U. reticulata Miyake & McEachran, 1988 `-- U. simulatrix Miyake & McEachran, 1988Reference(s):
Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698Carroll, R. L., 1988: Appendix. 594-648
in Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698Long, J. A., 1995: The Rise of Fishes: 500 million years of evolution.
–Johns Hopkins University Press, Baltimore & London, pp. 1-223Nelson, J. S., 1994: Fishes of the world.
–John Wiley & Sons Inc., New York, 1994, xx-600Mould, B., 1995-1997: The nomenclature and distribution of the recent Elasmobranchii.
–iNet: http://ibis.nott.ac.uk/elasmobranch.html