Tenebrolamina aequiscutum

(Gartner, 1967a) Varol, n. comb. May 18, 2021
T aequiscutum c

T aequiscutum a

Set number: 1024

  • Tenebrislaminam aequiscutum 26913 1
  • Tenebrislaminam aequiscutum 26911 2
  • Tenebrislaminam aequiscutum 26910 3
  • Tenebrislaminam aequiscutum 26909 4
    10µm
Tenebrolamina aequiscutum, Middle Miocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean
Final Epithet
Tenebrolamina aequiscutum (Gartner, 1967a) Varol, n. comb.
Basionym

Cyclococcolithus aequiscutum Gartner, 1967a

Synonyms

Tremalithus rotula Kamptner, 1948, Invalid ICN Art. 35.1

Cyclicoccolithus rotula (Kamptner, 1948) Kamptner, 1956, Invalid ICN Art. 35.1

Cyclococcolithus cricotus Gartner, 1967a

Geminilithella rotula (Kamptner, 1948) Backman, 1980, Invalid ICN Art. 35.1

Umbilicosphaera rotula (Kamptner, 1948) Varol, 1982, Invalid ICN Art. 35.1

Description

Small (< 7.0 µm), circular species of Tenebrolamina Varol, in prep., have a wide central area surrounded by narrow beaded segments and equal-diameter single-tiered shields. The tube cycle is indistinct. The shields are non-birefringent, but beaded segments are very weakly birefringent. The distal shield is made up of strongly imbricated segments (sutures display left-handed inclination), whereas the proximal shield consists of non-imbricated segments with almost radial sutures. The segments of the proximal shield and the distal shield are thickened around the central opening.
 

Remarks

Tenebrolamina eaquiscutum is distinguished from Tenebrolamina lordii (Varol, 1982) Varol, n. comb. by being smaller than 7.0µm. It differs from Tenebrolamina jafarii (Müller, 1974c) Varol, n. comb. by its larger size and having a larger central opening.

References

Backman, J. 1980. Miocene-Pliocene nannofossils and sedimentation rates in the Hatton-Rockall Basin, NE Atlantic Ocean. Stockholm Contributions in Geology 36: 1-91.

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

Kamptner, E. 1948. Coccolithen aus dem Torton des Inneralpinen Wiener Beckens. Anzeiger der Österreichische Akademie der Wissenschaften, Mathematische-Naturwissenschafliche Klasse, Wien. 157: 1-16.

Müller, C. 1974c. Nannoplankton aus dem Mittel-Miozän von Walbersdorf (Burgenland). Senckenbergiana Lethaea 55: 389-405.

Varol, O. 1982. Calcareous nannofossils from the Antalya Basin, Turkey. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte. 4: 244-256.

Taxonomy
Tenebrolamina
Uncategorised
Biostratigraphy
  • Phanerozoic
    • Cenozoic
      • Quaternary
        • Pleistocene
          • Early Pleistocene
            • Gelasian
      • Neogene
        • Miocene
          • Early Miocene
            • Aquitanian
Stratigraphic Range
Aquitanian - Gelasian
Age (Ma)
22.90 - 2.42
Holotype
Tenebrislaminam aequiscutum 26913

Cyclococcolithus eaquiscutum Gartner, 1967

Neogene

Sigsbee knolls, Gulf of Mexico.