Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumSouth African Museum, 1992 - Natural history |
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Page 71
... association of certain species of Acrioceras with Crioceratites , as well as similarities in the early spiral whorls , suggests that they may represent dimorphic pairs . Recognition of this type of dimorphism would simplify systematics ...
... association of certain species of Acrioceras with Crioceratites , as well as similarities in the early spiral whorls , suggests that they may represent dimorphic pairs . Recognition of this type of dimorphism would simplify systematics ...
Page 130
... association substantiated by the co - occurrence of only two specimens— the holotype of C. ( C. ) australis and Acrioceras sp . in the basal bed ( Bed 1 ) at locality 170 . The association of , and the morphological similarity between ...
... association substantiated by the co - occurrence of only two specimens— the holotype of C. ( C. ) australis and Acrioceras sp . in the basal bed ( Bed 1 ) at locality 170 . The association of , and the morphological similarity between ...
Page 131
... association is analogous to that of Acrioceras - ' Emericiceras ' in the Tethyan Realm , and Acrioceras - ' Paracrioceras ' in the Boreal Realm . A full discussion on dimorphism in the subfamilies Crioceratitinae and Ancyloceratinae ...
... association is analogous to that of Acrioceras - ' Emericiceras ' in the Tethyan Realm , and Acrioceras - ' Paracrioceras ' in the Boreal Realm . A full discussion on dimorphism in the subfamilies Crioceratitinae and Ancyloceratinae ...
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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