Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 80
... strong trituberculate ornamentation of the early whorls of ' C. ' yrigoyeni . Close coiling ( albeit not with a dorsal zone of impression ) associated with strong ornamentation of the inner whorls is known in the Boreal ' Paracrioceras ...
... strong trituberculate ornamentation of the early whorls of ' C. ' yrigoyeni . Close coiling ( albeit not with a dorsal zone of impression ) associated with strong ornamentation of the inner whorls is known in the Boreal ' Paracrioceras ...
Page 93
... strong , rounded tubercles occur at or slightly below midflank . When well preserved , these are revealed as the bases of short , wedge - shaped spines ; from them , the ribs pass straight across the flanks and bear prominent ventro ...
... strong , rounded tubercles occur at or slightly below midflank . When well preserved , these are revealed as the bases of short , wedge - shaped spines ; from them , the ribs pass straight across the flanks and bear prominent ventro ...
Page 114
... strong ventrolateral and strong ventral tubercles . This range of variation is also seen on the shafts of our specimens . In the compressed variety , ribbing is dense and prorsiradiate , and only ventral tubercles , linking two to three ...
... strong ventrolateral and strong ventral tubercles . This range of variation is also seen on the shafts of our specimens . In the compressed variety , ribbing is dense and prorsiradiate , and only ventral tubercles , linking two to three ...
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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