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The Carboniferous amphibian Tuditanus (Eosauravus) and the distinction between microsaurs and reptiles. American Museum novitates ; no. 2337

Show simple item record Carroll, Robert Lynn, 1938- en_US Baird, Donald. en_US 2005-10-06T16:29:10Z 2005-10-06T16:29:10Z 1968 en_US
dc.description 50 p. : ill. ; 24 cm. en_US
dc.description Includes bibliographical references (p. 47-50). en_US
dc.description.abstract "The genus Tuditanus (Eosauravus) from the Middle Pennsylvanian of Linton, Ohio, is redescribed on the basis of the two type specimens, neither of which had previously been prepared. This animal, which has been considered alternatively a microsaurian amphibian and a primitive reptile, proves to be a microsaur having these characteristics: sculptured skull roof with orbits lying at mid-length and palpebral cups; about 25 isodont marginal teeth; postparietals occipital in position; 29 presacral vertebrae; ilium with dorsal and posterior processes; stout limbs with entepicondylar foramen in humerus; tetradactyl manus with phalangeal count of 2, 3, 4, 3; pentadactyl pes with astragalus and calcaneum and a phalangeal count of 2, 3, 4, 5, 4; and hoe-shaped ungual phalanges. Tuditanus is clearly a member of the central group of microsaurs, although it shows a number of terrestrial adaptations similar to those observed in captorhinomorph reptiles. The anatomy of all microsaur genera is reviewed in order to determine whether any members of this group might be related to the ancestry of reptiles. The following features are found to be characteristic of all microsaurs, and to distinguish them from reptiles: (1) the presence of no more than a single bone in the temporal series; (2) the absence of a transverse flange from the pterygoid; (3) the concave occipital condyle articulating with a single specialized cervical vertebra; (4) the absence of trunk intercentra; and (5) the oval dorsal scales with radial striations superimposed on a concentric growth pattern. These features indicate that microsaurs could share a common ancestry with reptiles only at, or near, the level of the rhipidistian fish and only in pre-Carboniferous time"--P. 46-47. en_US
dc.format.extent 6614920 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, N.Y. : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 2337 en_US
dc.subject.lcc QL1 .A436 no.2337, 1968 en_US
dc.subject.lcsh Tuditanus punctulatus. en_US
dc.subject.lcsh Amphibians, Fossil -- Ohio -- Jefferson County. en_US
dc.subject.lcsh Microsauria -- Classification. en_US
dc.subject.lcsh Reptiles, Fossil. en_US
dc.subject.lcsh Reptiles -- Evolution. en_US
dc.subject.lcsh Paleontology -- Pennsylvanian -- Ohio -- Jefferson County. en_US
dc.subject.lcsh Paleontology -- Ohio -- Jefferson County. en_US
dc.title The Carboniferous amphibian Tuditanus (Eosauravus) and the distinction between microsaurs and reptiles. American Museum novitates ; no. 2337 en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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