Annals of the South African Museum

adult Africa Albian ammonoids appear August authors becomes Benson body chamber bottom depth Campanian Cape Town Cenomanian changes Chiplonkar & Ghare Collignon compressed Coniacian Cretaceous Cruise described diameter dimorphism discussed distinct distribution early et al external figures fish flanks forms front genus given Group Hoplitoplacenticeras Hyatt Hypengonoceras Iljin illustrations included indicated Kennedy Lampanyctodes hectoris lateral less lobe locality Lower Macroconch Madagascar major Marine material Museum narrow Note occur oceanic ontogenetic ontogeny original ornament panopsus phragmocone placenta Placenticeras kaffrarium Etheridge Placenticeratidae populations Poseidonamicus position present Proplacenticeras range referred region relatively ribs rounded saddle separated Shannon shelf shell similar Smith smooth South African southern southern Benguela species specimens stage stations strong suggested suture line Table temperature Turonian umbilical tubercles Upper upwelling values venter ventral ventral clavi whorl section Wright zone Zululand