Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 93
... ribs per whorl . These arise on the umbilical wall and bear faint conical to radially elongate tubercles on the ... major in some individuals . Furthermore , the numbers of sec- ondary ribs may be either variable or constant in ...
... ribs per whorl . These arise on the umbilical wall and bear faint conical to radially elongate tubercles on the ... major in some individuals . Furthermore , the numbers of sec- ondary ribs may be either variable or constant in ...
Page 107
... major ribs , if present , are or are not trituberculate . His scheme is as follows : 1. Acrioceras s.s Hyatt , 1900 ( type species Ancyloceras tabarelli Astier , 1851 : 19 , pl . 7 ( fig . 9 ) ) - coiling acrioceratid , major ribs ...
... major ribs , if present , are or are not trituberculate . His scheme is as follows : 1. Acrioceras s.s Hyatt , 1900 ( type species Ancyloceras tabarelli Astier , 1851 : 19 , pl . 7 ( fig . 9 ) ) - coiling acrioceratid , major ribs ...
Page 114
... ribs thicken and strengthen across the flanks . On some ribs there is a slight indication of strengthening at the ... major ribs bearing variably developed umbilical tubercles , very strong ventrolateral and strong ventral ...
... ribs thicken and strengthen across the flanks . On some ribs there is a slight indication of strengthening at the ... major ribs bearing variably developed umbilical tubercles , very strong ventrolateral and strong ventral ...
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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