Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 75
... followed here . The most significant aspect of Wiedmann's ( 1962 ) work was that he recognized a trend towards recoiling ( Fig . 1 ) , and the concurrent reduction or simplification of ornamentation on the outer whorls in some of the ...
... followed here . The most significant aspect of Wiedmann's ( 1962 ) work was that he recognized a trend towards recoiling ( Fig . 1 ) , and the concurrent reduction or simplification of ornamentation on the outer whorls in some of the ...
Page 107
... followed by Kakabadze ( 1981 ) and recently also by Vašiček & Michalík ( 1988 ) . Thomel ( 1964 ) followed Sarkar's ( 1955 ) views , and later Thomel et al . ( 1987 ) added the genus Subaspinoceras ( type species Ancyloceras mulsanti ...
... followed by Kakabadze ( 1981 ) and recently also by Vašiček & Michalík ( 1988 ) . Thomel ( 1964 ) followed Sarkar's ( 1955 ) views , and later Thomel et al . ( 1987 ) added the genus Subaspinoceras ( type species Ancyloceras mulsanti ...
Page 114
... 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 , such as ...
... 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 , such as ...
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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