Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 94
... body - chamber modifications seen in the Argentinian material with the development of bullae on the ribs and even partial uncoiling in some ( e.g. Aguirre Urreta 1981 , pl . 4 ( fig . b ) ) . Crioceratites ( C. ) australis sp . nov ...
... body - chamber modifications seen in the Argentinian material with the development of bullae on the ribs and even partial uncoiling in some ( e.g. Aguirre Urreta 1981 , pl . 4 ( fig . b ) ) . Crioceratites ( C. ) australis sp . nov ...
Page 127
... body chamber . Coiling is involute , with a small , shallow umbilicus ( 20 % of the diameter ) . The umbilical wall is flat , and inclined outwards ; the umbilical shoulder is abruptly rounded . The whorl section is compressed ( whorl ...
... body chamber . Coiling is involute , with a small , shallow umbilicus ( 20 % of the diameter ) . The umbilical wall is flat , and inclined outwards ; the umbilical shoulder is abruptly rounded . The whorl section is compressed ( whorl ...
Page 130
... body chamber fragment of Crioceratites ( C. ) austra- lis . But if we accept these as a dimorphic pair , it would mean formally separating finely and coarsely ribbed Acrioceras ( A. ) zulu . On purely morpho- logical grounds ...
... body chamber fragment of Crioceratites ( C. ) austra- lis . But if we accept these as a dimorphic pair , it would mean formally separating finely and coarsely ribbed Acrioceras ( A. ) zulu . On purely morpho- logical grounds ...
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Common terms and phrases
Acrioceras Acrioceras sp Africa Aguirre Urreta 1981 ammonites Ammonoidea Ancyloceras Ancyloceratinae Aptian Aspinoceras aspinoceratid australis sp barremense BMNH body chamber Boreal and Tethyan bullae ceras cliff and gully close coiling coarsely ornamented Collignon 1962 compressed Crioceratites Crioceratites s.s. Cryptocrioceras cundimarcae d'Orbigny diameter dimorphism discussion early whorls emerici Emericiceras family Ancyloceratidae flexuous genus genus Crioceratites Geology Giovine group of Crioceratites Hauterivian Hemihoplites sp holotype Immel inner whorls Kakabadze 1981 Leveillé lobe locality 170 Lower Barremian major ribs material Menuthiocrioceras Mlambongwenya Trading Store monopujaae Neuquén Obata outer whorls Palaeontology Paracrioceras Paraspinoceras Patagonia Pedioceras phragmocone Pseudothurmannia Rawson referred ribs Riccardi & Aguirre Sarkar Sornayites South African Museum southern Patagonia Spath species groups specimens tabarelli Astier taxonomic Tethyan Realm text-fig Thieuloy Thomel trituberculate ribs tubercles type species umbilical shoulder umbilical wall uncoiled Unterkreide Upper Barremian Upper Hauterivian Valanginian venter ventral tubercles ventrolateral shoulder whorl section Wiedmann yrigoyeni Leanza zulu sp Zululand