Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 81
... possible to regard ' Sornayites ' in the Lower Barremian as ancestral to ' Cryptocrioceras ' in the Upper Barremian but it cannot be proven . Even if this suggested phylogenetic sequence is not wholly true , the features of ' Cryptocrio ...
... possible to regard ' Sornayites ' in the Lower Barremian as ancestral to ' Cryptocrioceras ' in the Upper Barremian but it cannot be proven . Even if this suggested phylogenetic sequence is not wholly true , the features of ' Cryptocrio ...
Page 130
... possible dimorphic association of finely ribbed Acrioceras ( A. ) zulu with Crioceratites ( C. ) australis may justify formal separation of these from coarsely ribbed Acrioceras ( A. ) zulu . Another alternative might be to link C. ( C ...
... possible dimorphic association of finely ribbed Acrioceras ( A. ) zulu with Crioceratites ( C. ) australis may justify formal separation of these from coarsely ribbed Acrioceras ( A. ) zulu . Another alternative might be to link C. ( C ...
Page 131
... possible , or probable , that they constitute a dimorphic pair . This association is analogous to that of Acrioceras - ' Emericiceras ' in the Tethyan Realm , and Acrioceras - ' Paracrioceras ' in the Boreal Realm . A full discussion on ...
... possible , or probable , that they constitute a dimorphic pair . This association is analogous to that of Acrioceras - ' Emericiceras ' in the Tethyan Realm , and Acrioceras - ' Paracrioceras ' in the Boreal Realm . A full discussion on ...
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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