Set number: 1425

  • Pennalithus extensus VR 10078 1
  • Pennalithus extensus VR 10077 2
  • Pennalithus extensus VR 10074 3
  • Pennalithus extensus VR 10085 4
  • Pennalithus extensus VR 10079 5
  • Pennalithus extensus VR 10076 6
  • Pennalithus extensus VR 10075 7
  • Pennalithus extensus VR 10072 8
  • Pennalithus extensus VR 10081 9
  • Pennalithus extensus VR 10083 10
  • Pennalithus extensus VR 10070 11
  • Pennalithus extensus VR 10073 12
    10µm
Pennalithus extensus, Late Miocene, DSDP Leg 23, Site 225, Red Sea

Set number: 1198

  • Pennalithus extensus VR 06435 1
  • Pennalithus extensus VR 06438 2
  • Pennalithus extensus VR 06439 3
  • Pennalithus extensus VR 06433 4
  • Pennalithus extensus VR 06440 5
  • Pennalithus extensus VR 06437 6
  • Pennalithus extensus VR 06436 7
  • Pennalithus extensus VR 06429 8
  • Pennalithus extensus VR 06434 9
  • Pennalithus extensus VR 06430 10
  • Pennalithus extensus VR 06432 11
  • Pennalithus extensus VR 06431 12
    10µm
Pennalithus extensus, Late Miocene, DSDP Leg 23, Site 225, Red Sea
Final Epithet
Pennalithus extensus (Theodoridis, 1984) Varol, n. comb.
Basionym

Triquetrorhabdulus extensus Theodoridis, 1984

Synonyms

Orthorhabdus extensus (Theodoridis, 1984) Young & Bown, 2014

Description

Broad species of Pennalithus Varol, in prep. having three unequal size blades. Its c-axis is [vertical to the natural settling of the nannolith]. The dentate blade enlarged further to look like a €œsail€. Transverse striations ornament the surface of the dentate blade.

Remarks

Pennalithus extensus differs from Pennalithus rugosus (Bramlette & Wilcoxon, 1967) Varol, n. comb. and Pennalithus farnsworthii (Gartner, 1967) Varol, n. comb. by having a huge sail like a dentate blade. It is further distinguished from Pennalithus farnsworthii by having a straight median blade, whereas the latter has a distinctly curved median blade.

Pennalithus extensus is identified from Pennalithus striatus (Müller, 1974) Varol, n. comb. by lacking additional longitudinal ridges

Pennalithus extensus is differentiated from Pennalithus finifer (Theodoridis,1984) Varol, n. comb. by having lateral blades in the same plane whilst the latter has distinctly arched lateral blades

References

Bramlette, M. N. & Wilcoxon, J. A., (1967): Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. - Tulane Studies in Geology and Paleontology. 5: 93-131.

Gartner, S., (1967): Calcareous nannofossils from Neogene of Trinidad, Jamaica, and Gulf of Mexico. - University of Kansas Paleontological Contributions, Papers. 29: 1-7.

Müller, C., (1974): Calcareous nannoplankton, Leg 25 (Western Indian Ocean). - Initial Reports of the Deep Sea Drilling Project. 25: 579-633.

Theodoridis, S., (1984): Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. - Utrecht Micropaleontological Bulletin. 32: 1-271.

Young, J. R. & Bown, P. R., (2014): Some amendments to calcareous nannoplankton taxonomy. - Journal of Nannoplankton Research. 33(1): 39-46.