Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 93
... ribs pass straight across the 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 ...
... ribs pass straight across the 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 ...
Page 98
... ribs with three or four single , non - bullate ribs between . All ribs are delicate , narrow , rursiradiate and rather crowded . They flex backwards and are feebly convex to straight on the flanks , broadening towards the ventrolateral ...
... ribs with three or four single , non - bullate ribs between . All ribs are delicate , narrow , rursiradiate and rather crowded . They flex backwards and are feebly convex to straight on the flanks , broadening towards the ventrolateral ...
Page 114
... rib followed by three to five weakly tuberculate ribs . In a few cases a pair of flank ribs connect to one of these more pronounced tubercles . All ribs are broad and low and feebly convex across the venter . Less compressed forms ...
... rib followed by three to five weakly tuberculate ribs . In a few cases a pair of flank ribs connect to one of these more pronounced tubercles . All ribs are broad and low and feebly convex across the venter . Less compressed forms ...
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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