Nannotax3 - ntax_cenozoic - Pemma basquense

Citation: Pemma basquense (Martini, 1959) Báldi-Beke, 1971

Basionym: Micrantholithus basquensis Martini, 1959

Synonyms:

Micrantholithus parisiensis Bouché 1962
Micrantholithus parisiensis parisiensis Bouché 1962
Micrantholithus parisiensis major Bouché 1962
Pemma basquense basquense (Martini 1959) Báldi-Beke, 1971

Variants:

Pemma angulatum Martini, 1961 - more angular
Micrantholithus complicatus Chang 1969 - extra ridges developed from the sutural ridges
Micrantholithus floridus Chang 1969 - form with broad sutural ridges and only reduced holes bwtween them
Micrantholithus serratus Chang 1969 = Pemma serratum (Chang 1969) Bybell & Gartner 1972 - serrated margin
Micrantholithus n. sp. A Chang 1969
Pemma balium Bybell & Gartner 1972 - thin outer edge to the segments
Micrantholithus altus Bybell & Gartner, 1972 - elevated form
Micrantholithus procerus Bukry & Bramlette 1969 - elevated form with weaker indentations
Micrantholithus basquensis crassus Bouché 1962 = Pemma basquense crassum (Bouché 1962) Gartner & Bybell 1972 - form with thickened ridges and reduced space between

Taxonomic discussion: The numerous synonyms / variants described reflect the fact that these ornate Micrantholithus specimens show a great range of variablity in both eleveation and development of the sutural ridges. In additon varying degrees of overgrowth can produce further variation. Attempts at subdiving the gruop do not seem to be profitable.

See also: Micrantholithus bulbosus - similar morphotype but with indentations rather than depressions;

Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: [PRB rough estimate]

References:

Báldi-Beke, M. (1971). The Eocene nannoplankton of the Bakony Mountains, Hungary. Annales Instituti Geologici Publici Hungarici. 54(4): 13-38. gs

Bouché, P. M. (1962a). Nannofossiles calcaires de Lutétien du Bassin de Paris. Revue de Micropaléontologie. 5: 75-103. gs

Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Bukry, D. & Bramlette, M. N. (1969b). Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology. 7: 131-142. gs V O

Bybell, L. M. & Gartner, S. (1972). Provincialism among mid-Eocene calcareous nannofossils. Micropaleontology. 18(319-336): -. gs

Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs V O

Jones, A. P. & Dunkley Jones, T. (2020). Middle Eocene to Early Oligocene calcareous nannofossils from the Nanggulan Formation, Java, Indonesia. Journal of Nannoplankton Research. 30(1): 57-79. gs V O

Martini, E. (1959c). Discoasteriden und verwandte Formen in NW-deutschen Eozän (Coccolithophorida). 2. Stratigraphische Auswertung. Senckenbergiana Lethaea. 40: 137-157. gs

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

Varol, O. (1998). Palaeogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 200-224. gs

Tags	LITHS: nannolith-radiate, pentagonal, CA: pores, CROSS-POLARS: T-prominent,
Metrics	Lith size: 6->17µm; Segments: 5->5; Data source notes: lith size (diameter) from ODs & illustrated specimens

Pemma basquense

References:

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