Two new species, three new forms in open nomenclature and two previously known species of the genus Pithonella (sensu Bolli, 1974), attributed to the dinoflagellate family Peridiniaceae are described from Upper Cretaceous to lower Pleistocene sediments of the Walvis Ridge, southeastern Atlantic Ocean. It is the first time that pithonelloid calcareous dinoflagellates are described from sediment younger than early Paleocene.

F, few (5-15 specimens); R, rare (1-5 specimens); r, very rare (less than 1 whole specimen); ?, unknown.

Supplement to: Fütterer, Dieter K (1984): Pithonelloid calcareous dinoflagellates from the upper Cretaceous and Cenozoic of the southeastern Atlantic Ocean, Deep Sea Drilling Project Leg 74. In: Moore, TC Jr; Rabinowitz, PD; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 74, 533-541