Lapideacassis tricornus

Wind & Wise in Wise & Wind, 1977 Aug 03, 2020

Set number: 51

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10µm

Lapideacassis tricornus, Middle Albian, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Final Epithet

Lapideacassis tricornus Wind & Wise in Wise & Wind, 1977

Basionym

Lapideacassis tricornus Wind & Wise in Wise & Wind, 1977

Remarks

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.

References

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