Annals of the South African MuseumThe Museum, 1989 - Natural history |
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Page 245
... Ontogenetic changes . 3. Differing rates of development giving individuals of the same size but at a different point in ontogeny , different ornament ; a result of size dimorphism and of variation of adult size in individual dimorphs ...
... Ontogenetic changes . 3. Differing rates of development giving individuals of the same size but at a different point in ontogeny , different ornament ; a result of size dimorphism and of variation of adult size in individual dimorphs ...
Page 258
... ontogenetic stage . In the Zululand specimens very conspicuous differences are found in the whorl sections of specimens from the same restricted stratigraphic levels but with more or less the same type of ornament . Thus the ratio of ...
... ontogenetic stage . In the Zululand specimens very conspicuous differences are found in the whorl sections of specimens from the same restricted stratigraphic levels but with more or less the same type of ornament . Thus the ratio of ...
Page 278
... Ontogenetic changes For descriptive purposes the ontogeny in typical forms can be approximately divided into four stages . ( a ) Embryonic stage . This includes the very early stage with the protoconch and subsequent early whorls . This ...
... Ontogenetic changes For descriptive purposes the ontogeny in typical forms can be approximately divided into four stages . ( a ) Embryonic stage . This includes the very early stage with the protoconch and subsequent early whorls . This ...
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Common terms and phrases
adult adventive lobe Albian ammonites Atlantic Benson body chamber bottom depth Campanian Cape Town catch rates Cenomanian Central Asia Chiplonkar & Ghare compressed Coniacian continental diameter Diaphus dimorphism distribution Engonoceratidae fauna flanks genus Group holotype Hoplitoplacenticeras Hulley Hyatt Hypengonoceras decaryi Collignon Iljin intraspecific variation isobath Karamaites Kennedy & Wright Klinger Lampanyctodes hectoris lanternfish lateral lobe lateral ornament lateral tubercles Maastrichtian Macroconch Madagascar Marine Metaplacenticeras Michailova Microconch with type myctophid oceanic ontogenetic changes ontogeny Orange Shelf ostracod Parengonoceras Paulcke pelagic phragmocone Placenticeras kaffrarium Etheridge Placenticeras polyopsis Placenticeratidae polyopsis Dujardin Proplacenticeras pseudoceanic ribs saddle Santonian separated Shannon shell smooth South African Museum south-western Africa southern Benguela region Spath specimens specimens.h¹ stage stations subkaffrarium sutural ontogeny suture suture line SW Cape temperature text-fig Turonian Type species umbilical tubercles umbilicus umkwelanense Upper Albian Upper Campanian Upper Cretaceous upwelling venter ventral clavi Whatley whorl section Wiedmann Zululand