Annals of the South African Museum, Volume 110The Museum, 2003 - Natural history |
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Page 134
... Prionocycloceras ; there can be no doubt , however , that the latter evolved from the former . The Angolan material ... Prionocycloceras species are an artefact of polymorphism . Prionocycloceras portarum Etayo - Serna ( 1979 : 95 , pl ...
... Prionocycloceras ; there can be no doubt , however , that the latter evolved from the former . The Angolan material ... Prionocycloceras species are an artefact of polymorphism . Prionocycloceras portarum Etayo - Serna ( 1979 : 95 , pl ...
Page 135
Prionocycloceras mediotuberculatum ( Gerhardt ) ( 1897 : 198 , pl . 5 ( fig . 23 ) ) differs from the present species in having uniformly developed , flexuous , main ribs which swell at midflank , with weaker umbilical bullae and no ...
Prionocycloceras mediotuberculatum ( Gerhardt ) ( 1897 : 198 , pl . 5 ( fig . 23 ) ) differs from the present species in having uniformly developed , flexuous , main ribs which swell at midflank , with weaker umbilical bullae and no ...
Page 136
... Prionocycloceras . It differs from P. carvalhoi ( Howarth ) in that its ribbing becomes indistinct beyond 40 mm diameter , umbilical bullae are lacking , and the ventrolateral spines are directed horizontally outwards . Perhaps it is ...
... Prionocycloceras . It differs from P. carvalhoi ( Howarth ) in that its ribbing becomes indistinct beyond 40 mm diameter , umbilical bullae are lacking , and the ventrolateral spines are directed horizontally outwards . Perhaps it is ...
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ammonites Angola Annals archosaurs articulates Baculites Berkeley BMNH body chamber Campanian Cape Town caudal vertebrae centrum Charig coiling compressed Coniacian constrictions Cooper Cretaceous ammonites Damesites dentary diameter Didymoceras Diplomoceras Diplomoceras cylindraceum Defrance dorsal edge Erythrosuchus africanus Broom Eubostrychoceras fauna fenestra Figure flanks foramen fossils fragments gardeni Baily Garjainia genus Geological Géologique Gisement Glyptoxoceras Hauericeras holotype Howarth Huene Hyatt Hypophylloceras incomplete intercentra internal moulds Jimbo kaffrarium Kennedy & Cobban Klinger & Kennedy Kossmat Kossmaticeras KwaZulu Lateral view locality lower Campanian Maastrichtian Madagascar material Matsumoto maxilla medial views Mesopuzosia Morrowites Neocrioceras Neoglyptoxoceras Nostoceras Nostoceras Bostrychoceras Ochev ornament Paleontology phragmocone Placenticeras posterior posteriorly posteroventral premaxilla Prionocycloceras proterosuchids ribs Santonian São Nicolau shaft skull roof South African Museum Spath specimens St Lucia Formation Stoliczka Superfamily suture Tetragonites Texanites text-fig Turonian Type species umbilicus UNIVERSITY OF CALIFORNIA Upper Cretaceous venter ventral views ventrolateral tubercles whorl height whorl section