Taxonomy:
Distinguishing features: A discoaster with 8 bifurcating rays without a prominent central knob. The rays form an overlapping pattern that spirals dextrally and is distinctive of this species.
Farinacci & Howe catalog pages: D. gemmifer *
Search data:Tags | LITHS: nannolith-radiate, star-shaped, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 8->22µm; Segments: 8->8; Data source notes: size from OD & illustrated specs |
Geological Range:
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Neptune records
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Neptune records
Plot of occurrence data:
Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs V O Stradner, H. (1961). Vorkommen von Nannofossilien im Mesozoikum und Alttertiär. Erdoel-Zeitschrift. 77(3): 77-88. gsReferences:
![]() |
Discoaster gemmifer compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=470 Go to Archive.is to create a permanent copy of this page - citation notes |