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
... distinct morphological trends can be observed ( Fig . 8 ) . These are from oldest to youngest . Labeceras 1. Decrease in overall size . 2. Lateral lobe ( L ) changes from asymmetric to symmetrically trifid . 3. Whorl section becomes ...
... distinct morphological trends can be observed ( Fig . 8 ) . These are from oldest to youngest . Labeceras 1. Decrease in overall size . 2. Lateral lobe ( L ) changes from asymmetric to symmetrically trifid . 3. Whorl section becomes ...
Page 196
... Distinct successive pairs of Labeceras and Myloceras can be recognized . In both there seems to be an increasing trend towards hydrodynamic stability and / or ' streamlining ' of ornament . This leads to surprising homoeomorphy between ...
... Distinct successive pairs of Labeceras and Myloceras can be recognized . In both there seems to be an increasing trend towards hydrodynamic stability and / or ' streamlining ' of ornament . This leads to surprising homoeomorphy between ...
Page 207
... distinct nick - point and coiling , virtually as in Myloceras . Within this crude framework Australian and Afro - Malagassy forms can be compared . No forms similar to Myloceras gr . ex . besairiei or Labeceras gr . ex . rectum are ...
... distinct nick - point and coiling , virtually as in Myloceras . Within this crude framework Australian and Afro - Malagassy forms can be compared . No forms similar to Myloceras gr . ex . besairiei or Labeceras gr . ex . rectum are ...
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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