Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 93
... flanks and bear prominent ventro- lateral tubercles that are the bases of sharp spines . Already at this diameter , the lower two rows of tubercles are more prominent on some ribs than on others . With increase in size , the umbilical ...
... flanks and bear prominent ventro- lateral tubercles that are the bases of sharp spines . Already at this diameter , the lower two rows of tubercles are more prominent on some ribs than on others . With increase in size , the umbilical ...
Page 114
... flanks , feebly convex on the inner flank , concave on the outer flank , and quite markedly projected on the ventrolateral shoulder . Narrow at the umbili- cus , the ribs thicken and strengthen across the flanks . On some ribs there is ...
... flanks , feebly convex on the inner flank , concave on the outer flank , and quite markedly projected on the ventrolateral shoulder . Narrow at the umbili- cus , the ribs thicken and strengthen across the flanks . On some ribs there is ...
Page 124
... flank than on the inner . At the point of splitting , the ribs flex back- wards , and are convex across the middle of the flanks , concave on the outer flank , and strongly projected on the ventrolateral shoulders . The ribs pass ...
... flank than on the inner . At the point of splitting , the ribs flex back- wards , and are convex across the middle of the flanks , concave on the outer flank , and strongly projected on the ventrolateral shoulders . The ribs pass ...
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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