Set number: 475

  • Orthorhabdus serratus 14262 1
  • Orthorhabdus serratus 14267 2
  • Orthorhabdus serratus 14269 3
  • Orthorhabdus serratus 14274 4
  • Orthorhabdus serratus 14263 5
  • Orthorhabdus serratus 14266 6
  • Orthorhabdus serratus 14268 7
  • Orthorhabdus serratus 14277 8
  • Orthorhabdus serratus 14265 9
  • Orthorhabdus serratus 14272 10
  • Orthorhabdus serratus 14271 11
    10µm
Orthorhabdus serratus, Middle Miocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 476

  • Orthorhabdus serratus 22722 1
  • Orthorhabdus serratus 22725 2
  • Orthorhabdus serratus 22726 3
  • Orthorhabdus serratus 22729 4
  • Orthorhabdus serratus 22723 5
  • Orthorhabdus serratus 22724 6
  • Orthorhabdus serratus 22727 7
  • Orthorhabdus serratus 22728 8
    10µm
Orthorhabdus serratus, Middle Miocene, ODP Leg 154, Site 925C, Ceara Rise, Equatorial Atlantic Ocean

Set number: 477

  • Orthorhabdus serratus 27657 1
  • Orthorhabdus serratus 27656 2
  • Orthorhabdus serratus 27653 3
  • Orthorhabdus serratus 27661 4
  • Orthorhabdus serratus 27658 5
  • Orthorhabdus serratus 27655 6
  • Orthorhabdus serratus 27654 7
  • Orthorhabdus serratus 27659 8
    10µm
Orthorhabdus serratus, Middle Miocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 478

  • Orthorhabdus serratus 30365 1
  • Orthorhabdus serratus 30360 2
  • Orthorhabdus serratus 30357 3
  • Orthorhabdus serratus 30350 4
  • Orthorhabdus serratus 30366 5
  • Orthorhabdus serratus 30356 6
  • Orthorhabdus serratus 30353 7
  • Orthorhabdus serratus 30349 8
  • Orthorhabdus serratus 30347 9
  • Orthorhabdus serratus 30346 10
  • Orthorhabdus serratus 30343 11
  • Orthorhabdus serratus 30373 12
  • Orthorhabdus serratus 30370 13
  • Orthorhabdus serratus 30363 14
  • Orthorhabdus serratus 30382 15
  • Orthorhabdus serratus 30362 16
  • Orthorhabdus serratus 30381 17
  • Orthorhabdus serratus 30380 18
  • Orthorhabdus serratus 30348 19
  • Orthorhabdus serratus 30355 20
  • Orthorhabdus serratus 30376 21
  • Orthorhabdus serratus 30375 22
  • Orthorhabdus serratus 30385 23
  • Orthorhabdus serratus 30386 24
    10µm
Orthorhabdus serratus, Middle Miocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

In mobile mount

Final Epithet
Orthorhabdus serratus Bramlette & Wilcoxon, 1967
Basionym

Orthorhabdus serratus Bramlette & Wilcoxon, 1967

Synonyms

Triquetrorhabdulus martinii Gartner, 1967

Description

Plan view: Elongate nannolith having three blades which are truncated at one end and pointed at the other end. C-axis is vertical [vertical to the natural settling of the specimen]. The width of the median blade seems to be wider than other blades. The blade(s) may develop spine-like projection.

Side view: A hockey-stick shape nannolith displaying high birefringence having a tangential C-axis [perpendicular to the length of the specimen]

Remarks

On the plan view, Orthorhabdus differs from Triquetrorhabdulus Martini (1965) species by having non-birefringent and truncated blades at one end.

On the side view, Orthorhabdus is distinguished from Triquetrorhabdulus species by having a hockey-stick shape with a tangential c-axis. The latter has an axial c-axis.

References

Bramlette, M. N. & Wilcoxon, J. A., (1967b): 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.

Martini, E., (1965): Mid-Tertiary calcareous nannoplankton from Pacific deep-sea cores. - Colston Papers. 17: 393-411