Lapideacassis tricornus Wind & Wise in Wise & Wind, 1977
Tall species of Lapideacassis having three spines at less than 45° to the length. In the above-illustrated specimen, only one spine is intact but a sign of the other two broken off spines is there. The ratio of height to the width [without spines and collar] is between 1.5 and 2.0. The second distal tier is tapering as in holotype.
Lapideacassis tricornus is easily distinguished from Lapideacassis trispina by having tapering the second tier. It is very difficult to differentiate Lapideacassis tricornus from Lapideacassis multispinata when the spines broke off.
Wise, S. W., Wind, F. H., 1977. Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project 36, 269-491
Wind & Wise in Wise & Wind, 1977
DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau