Set number: 51

  • Lapideacassis tricornus 15153 1
  • Lapideacassis tricornus 15150 2
  • Lapideacassis tricornus 15154 3
  • Lapideacassis tricornus 15158 4
  • Lapideacassis tricornus 15152 5
  • Lapideacassis tricornus 15151 6
  • Lapideacassis tricornus 15155 7
  • Lapideacassis tricornus 15156 8
    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