Annals of the South African Museum: Annale Van Die Suid-Afrikaanse MuseumWest, Newman & Company for the trustees of the Museum, 1989 - Natural history |
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Page 191
... lateral tubercles . 5. Ornament becomes subdued in later forms and umbilical tubercles reduced . Myloceras 1. Decrease in overall size . 2. Lateral lobe ( L ) changes from asymmetric to symmetrically trifid . 3. Whorl section becomes ...
... lateral tubercles . 5. Ornament becomes subdued in later forms and umbilical tubercles reduced . Myloceras 1. Decrease in overall size . 2. Lateral lobe ( L ) changes from asymmetric to symmetrically trifid . 3. Whorl section becomes ...
Page 196
... lateral lappets or a ventral rostrum . Dimorphism has previously been suggested for Labeceratinae but , in my opinion , for the wrong reasons . Spath ( 1925 : 192 ) suggested that forms with and those without croziers ( in Myloceras ) ...
... lateral lappets or a ventral rostrum . Dimorphism has previously been suggested for Labeceratinae but , in my opinion , for the wrong reasons . Spath ( 1925 : 192 ) suggested that forms with and those without croziers ( in Myloceras ) ...
Page 199
... lateral lappets , whereas the probably closely related Myloceras has an aperture merely with a sinuous border ' . Material from Zululand shows that lateral lappets occur in both Labeceras and Myloceras but , that in relation to overall ...
... lateral lappets , whereas the probably closely related Myloceras has an aperture merely with a sinuous border ' . Material from Zululand shows that lateral lappets occur in both Labeceras and Myloceras but , that in relation to overall ...
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Common terms and phrases
abbreviated Africa-Madagascar and Australia Albian of Zululand AMMONITE Ancyloceratinae Angola Angola Basin Austral Basin Baculites BesairiƩ besairiei Collignon Brazil-Angola Basin Cape Basin Cenomanian ceras climate Cobban coiling Collignon 1963 comma compressed whorl section crassicostatum Cretaceous CROZIER Estancia La Vega Etheridge F G H faunas figures Gastropoda genera Hamites heteromorph Holotype intraspecific Labe Labeceras and Myloceras Labeceras crassetuberculatum Klinger Labeceras gr Labeceras rectum Labeceras Spath Later forms lateral lappets Leanza Leda Madagascar material McNamara microconch Middle Albian Mozambique Mylo Myloceras bituberculatum sp Myloceras gr Myloceras rotundum Klinger Myloceras serotinum Spath onshore Ornament paratypes parentheses Patagonia phylogenetic PHYLOGENY punctuation recorded Reyment Roman numerals Samana Range Santa Cruz Province scaphitids scientific name Sketch of aperture Smith South African Museum South Atlantic southern India straight shaft strati stratigraphic range suggested Suture line Synonymy systematics type species umbilical tubercles Upper Albian venter Venzo Walvis Ridge Wiedmann & Dieni Wright