caa a22 4500 388017503 CHVBK 20180307124915.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1017/S0022336000023994 doi S0022336000023994 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000023994 Sandy Michael R. Department of Geology, University of Dayton, 300 College Park, Dayton, Ohio 45469-2364 <sandy@neelix.udayton.edu> Loop ontogeny of the Late Triassic (Norian) terebratulid brachiopod Pseudorhaetina antimoniensis Sandy from Sonora, Mexico and its taxonomic significance [Elektronische Daten] [Michael R. Sandy] 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). Copyright © The Paleontological Society Journal of Paleontology Cambridge University Press 72/1(1998-01), 28-35 0022-3360 72:1<28 1998 72 JPA https://doi.org/10.1017/S0022336000023994 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000023994 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sandy Michael R. Department of Geology, University of Dayton, 300 College Park, Dayton, Ohio 45469-2364 <sandy@neelix.udayton.edu> NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/1(1998-01), 28-35 0022-3360 72:1<28 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge