Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 93
... stage of dense , relatively even , flexuous ribbing with single , long ribs and some intercalated ribs , occasional weak , radially elongated bullae low on the flank , no obvious tubercles ( but a thickened rib ) at the ventrolateral ...
... stage of dense , relatively even , flexuous ribbing with single , long ribs and some intercalated ribs , occasional weak , radially elongated bullae low on the flank , no obvious tubercles ( but a thickened rib ) at the ventrolateral ...
Page 98
... stage described above . In other specimens , only the second growth stage is visible ; here the whorl section is more compressed ( whorl breadth to height ratio is 0,7 ) . There are six to nine ribs in a distance equal to the whorl ...
... stage described above . In other specimens , only the second growth stage is visible ; here the whorl section is more compressed ( whorl breadth to height ratio is 0,7 ) . There are six to nine ribs in a distance equal to the whorl ...
Page 100
... stage and the appearance of prominent constrictions on the outer whorls is characteristic of this species , and easily separates it from Crioceratites ( C. ) yrigoyeni , as well as from the majority of other Crioceratites species ...
... stage and the appearance of prominent constrictions on the outer whorls is characteristic of this species , and easily separates it from Crioceratites ( C. ) yrigoyeni , as well as from the majority of other Crioceratites species ...
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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