Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum, Volume 96, Issues 6-9South African Museum, 1986 - Natural history |
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Page 302
... tubercles disappear and the ornament changes to narrow , simple , sharp ribs that pass radially around the whorl and to ribs arising in groups of two or three from an umbilical tubercle . On the final hook these tubercles also disappear ...
... tubercles disappear and the ornament changes to narrow , simple , sharp ribs that pass radially around the whorl and to ribs arising in groups of two or three from an umbilical tubercle . On the final hook these tubercles also disappear ...
Page 305
... tubercles , which are marginal to a siphonal depression . At this stage small ventrolateral tubercles can also be seen . At a diameter of 10 mm there are two kinds of ribs ; some are fine , non - tuberculate , and the others are strong ...
... tubercles , which are marginal to a siphonal depression . At this stage small ventrolateral tubercles can also be seen . At a diameter of 10 mm there are two kinds of ribs ; some are fine , non - tuberculate , and the others are strong ...
Page 349
... tubercles , as outlined above ( p . 320 ) . The presence or absence of tubercles has been used extensively in the classification of other heteromorph taxa . In most cases this is an objective , unambiguous criterion and easy to apply ...
... tubercles , as outlined above ( p . 320 ) . The presence or absence of tubercles has been used extensively in the classification of other heteromorph taxa . In most cases this is an objective , unambiguous criterion and easy to apply ...
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Common terms and phrases
Acrioceras Aedeagus Alcyonium variabile ammonites Ammonoidea Anal sternite Ancyloceras apex apical apomorphic Aptian arcuate asymmetrical Barremian of western basal bifid Cape Town capitulum Casey clypeus coenenchyme coiling Colchidites vulanensis australis colonies Colophon Colophon species CPBA Cretaceous d'Orbigny dilated Djanélidzé Dorsal process elytra evenly final hook forms fragments genera geol habitat Hamiticeras haughtoni Helicancylus patagonicus helix Heteroceras Heteroceratinae holotype izardi K. H. Barnard Kakabadze & Kennedy Kakabadze 1971a Klinger & Kennedy Koenen labrum Langeberg Leanza Lectotype Lucanidae Macroconch male mandibles material Metalcyonium montisatris sp morph ornament paessleri Paraimerites paramere Patagonia patagonicum planispiral plesiomorphic polyp primosi pronotum punctate referred ribs Río Mayer Río Mayer Formation Rouchadzé 1933 rounded sclerites shaft South African Museum Spath speciation species groups specimens stalk sternite stokoei Stolley suture line Swartberg Swartberg Range text-fig Thomson tibia Tixier-Durivault Tonohamites trituberculate tubercles Upper Barremian Ventral process vulanensis australis Klinger western Georgia whitei whorl section Zululand