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Loop ontogeny of the Late Triassic (Norian) terebratulid brachiopod Pseudorhaetina antimoniensis Sandy from Sonora, Mexico and its taxonomic significance

Published online by Cambridge University Press:  20 May 2016

Michael R. Sandy
Michael R. Sandy*
Affiliation:
Department of Geology, University of Dayton, 300 College Park, Dayton, Ohio 45469-2364
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Abstract

Juvenile specimens of the short-looped terebratulid brachiopod genus Pseudorhaetina Sandy have been investigated by the use of transverse serial sections. Internal structures indicate a simple brachidium (loop) is present with long flanges in adult specimens; the brachidium is approximately half the length of the dorsal valve; there is no complex loop metamorphosis in the central cavity of the brachiopod (i.e., no median septum). This combination of characters presents a taxonomic problem—Pseudorhaetina can neither be referred with confidence to superfamily Terebratuloidea, nor superfamily Loboidothyridoidea. Consequently Pseudorhaetina is, for the time being, assigned to a new and as yet unnamed superfamily representing a previously unrecognized part of the post-Paleozoic recovery and reradiation of Mesozoic articulate brachiopods (Rhynchonellata of Williams et al., 1996).

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 1 , January 1998 , pp. 28 - 35
Copyright
Copyright © The Paleontological Society 

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