Annals of the South African MuseumThe Museum, 1989 - Natural history |
From inside the book
Results 1-3 of 33
Page 245
... 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 . 4. Variation ...
... 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 . 4. Variation ...
Page 258
... change . Intraspecific variation and the nature and rate of ontogenetic change are far more prominent , and com- pletely overshadow morphological changes through time . As far as coiling is concerned , Placenticeratidae are extremely ...
... change . Intraspecific variation and the nature and rate of ontogenetic change are far more prominent , and com- pletely overshadow morphological changes through time . As far as coiling is concerned , Placenticeratidae are extremely ...
Page 266
... change in the form of the shell or in the degree of involution took place . Major changes affected the suture line . The lateral lobe ( L ) ( Ruzhentsev = U ) changes from asymmetrically trifid to bifid , and almost separated into two ...
... change in the form of the shell or in the degree of involution took place . Major changes affected the suture line . The lateral lobe ( L ) ( Ruzhentsev = U ) changes from asymmetrically trifid to bifid , and almost separated into two ...
Other editions - View all
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