Annals of the South African MuseumThe Museum, 1978 - Natual history |
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Page 68
... ornament declines , the ribs become low , broad and flexuous , arising in pairs from the bullae , whilst the whorl becomes compressed and lanceolate in section with a narrowly rounded venter which is crossed by ribs and has , as a ...
... ornament declines , the ribs become low , broad and flexuous , arising in pairs from the bullae , whilst the whorl becomes compressed and lanceolate in section with a narrowly rounded venter which is crossed by ribs and has , as a ...
Page 102
... ornament , if present , must have been weak . A few specimens begin to show traces of a ventral ridge , but not a keel at this diameter , although these features may be an artefact of preservation . From 0,8 mm onwards the shell is an ...
... ornament , if present , must have been weak . A few specimens begin to show traces of a ventral ridge , but not a keel at this diameter , although these features may be an artefact of preservation . From 0,8 mm onwards the shell is an ...
Page 280
... ornament . The whorl section changes from subrectangular to lanceolate , with the disappearance of all tubercles , and the ribs become strongly convex . There are generally 36-42 ribs per whorl in the middle growth stages , about as ...
... ornament . The whorl section changes from subrectangular to lanceolate , with the disappearance of all tubercles , and the ribs become strongly convex . There are generally 36-42 ribs per whorl in the middle growth stages , about as ...
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Common terms and phrases
abbreviation Aconeceras Africa Albian Alopecoceras Ammonites Angola Anisoceras Aptian authors BMNH body chamber Borissiakoceras Breistroffer Burchell's zebra burchelli Cape Town Casey Cenomanian Cobban Collected Collignon comma compressed Cretaceous diameter distal dorsal endopod Equus quagga exopod False Bay fauna female colonies figures flank genus geol Hamites Holotype Hysteroceras Igoda Formation Infertile colony K. H. Barnard Kennedy Klinger Kunene kunenensis Lateral view lobe Locality Mariella material Maxilla Maxilliped Millard Mortoniceras Durnovarites Natal Okavango ornament paratypes pereonite Pereopod perinflatum Pervinquière PF station Pictet & Campiche plains zebras pleonites Pleopod Plioplateia references Renz ribs River Sanmartinoceras Sanmartinoceras scientific name segment setae shell shoulder Sinzovia South African Museum southern Sowerby Spath specimens spines Stoliczkaia stripes subgenus subspecies suture Synonymy telson Tetragonites text-fig Theganeceras Therocephalia Type species umbilical umbilicus University of Cape Upper Albian uppermost Albian uropod USNMNH venter ventral ventrolateral tubercles whole mount whorl section Zambezi Zululand