. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history; Natuurlijke historie; Sociale geschiedenis; Culturele antropologie. CAMPANIAN AND MAASTRICHTIAN OSTRACODA 93 V. • 0 Fig. 44. Muscle scars. A. Agulhasina quadrata Dingle, 1971, TBD 818 Alphard Formation. Agulhas Bank, LV, Maastrichtian III. B. Dutoitella mimica gen. et sp. nov. SAM-K5749, TBD 818 Alphard Formation, Agulhas Bank, LV, Maastrichtian III. Scale bars 60/u,. Subfamily Trachyleberidinae Sylvester-Bradley, 1948 This subfamily is well represented by twenty-two species in the Campanian- Maastri
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history; Natuurlijke historie; Sociale geschiedenis; Culturele antropologie. CAMPANIAN AND MAASTRICHTIAN OSTRACODA 93 V. • 0 Fig. 44. Muscle scars. A. Agulhasina quadrata Dingle, 1971, TBD 818 Alphard Formation. Agulhas Bank, LV, Maastrichtian III. B. Dutoitella mimica gen. et sp. nov. SAM-K5749, TBD 818 Alphard Formation, Agulhas Bank, LV, Maastrichtian III. Scale bars 60/u,. Subfamily Trachyleberidinae Sylvester-Bradley, 1948 This subfamily is well represented by twenty-two species in the Campanian- Maastrichtian rocks of south-east Africa, with the genera Haughtonileberis, Oertliella, Trachyleberis, and Hermanites particularly important. Genus Haughtonileberis Dingle, 1969 This genus is one of the most important of the Cytheracea taxa in the Upper Cretaceous in south-east Africa. Its earliest records in this area are from the Santonian, and Dingle (1976) has reported one species in the Eocene, but recently Grosdidier (1979) has tentatively assigned several species to it from the Cenomanian-Turonian of Gabon. For most of the Campanian-Maastrichtian period in south-east Africa, the genus had numerically passed its peak, although during the Campanian I it is represented by four species (Fig. 45): H. haughtoni, H. fissilis, H. vanhoepeni, and H. nibelaensis. Only H. nibelaensis is confined to strata of Campanian- Maastrichtian age, and only H. fissilis ranges up into the Maastrichtian. Numeri- cally, the genus is most important in the Santonian (Dingle 1980) where it locally reaches over 50 per cent of the total ostracod populations in two species (H. haughtoni and H. fissilis). There is a steady, if erratic, decline in numbers through the upper Santonian, so that, although a further species appears in the uppermost Santonian (H. vanhoepeni), the Campanian opens with the genus constituting about 20 per cent of the total ostracod population (Fig. 45E). This abundance is maintained
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