Nannotax3 - ntax_cenozoic - Pontosphaera discopora

Citation: Pontosphaera discopora Schiller, 1925

Synonyms:

Discolithina callosa Martini 1969 [my identification - JRY 2016]
Pontosphaera callosa (Martini 1969) Varol 1982
Pontosphaera pacifica Burns (1973) [my identification - JRY 2015]

Taxonomic discussion: This is a rare and poorly documented species and arguably a dustbin for Pontosphaera specimens with mediim pores. It may prove to encompass more than one species or even simply to represent variants of other species.

Distinguishing features:
Parent taxon (Pontosphaera): Coccoliths are muroliths, central area with variable number of perforations. V-units form narrow imbricate outer wall, R-units form inner wall and central-area.
This taxon: Rim elevated, 3 or more cycles of medum-size pores.

Coccoliths similar to BCs of Scyphosphaera apsteinii BCs, but usually thicker and rim more clearly elevated

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Miocene Epoch (5.33-23.03Ma, base in Aquitanian stage). Data source: [JRY rough estimate]

References:

Bartolini, C. (1970). Coccoliths from sediments of the western Mediterranean. Micropaleontology. 16(2): 129-154. gs

Burns, D. A. (1973). Structural analysis of flanged coccoliths in sediments from the South West Pacific Ocean. Revista Española de Micropaleontología. 5(1): 147-160. gs O

Frada, M., Percopo, I., Young, J. R., Zingone, A., de Vargas, C. & Probert, I. (2009). First observations of heterococcolithophore-holococcolithophore life cycle combinations in the family Pontosphaeraceae (Calcihaptophycideae, Haptophyta). Marine Micropaleontology. 71(1): 20-27. gs

Gaarder, K. R. & Hasle, G. R. (1971). Coccolithophorids of the Gulf of Mexico. Bulletin of Marine Science. 21: 519-544. gs

Hallegraeff, G. M. (1984). Coccolithophorids (Calcareous Nanoplankton) from Australian waters. Botanica Marina. 27: 229-247. gs

Martini, E. (1969). Nannoplankton aus dem Miozän von Gabon (Westafrika). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 132: 283-300. gs

Müller, C. (1979). Calcareous nannofssils from the North Atlantic (Leg 48). Initial Reports of the Deep Sea Drilling Project. 48: 589-639. gs

Perch-Nielsen, K. (1972). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs

Perch-Nielsen, K. (1977). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs O

Schiller, J. (1925). Die planktonischen Vegetationen des adriatischen Meeres. A. Die Coccolithophoriden-Vegetation in den Jahren 1911-14. Archiv für Protistenkunde. 51: 1-130. gs

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

Winter, A. & Siesser, W. G. (1994). Atlas of living coccolithophores. In, Winter, A. & Siesser, W. G. (eds) Coccolithophores. Cambridge University Press, Cambridge 107-159. gs

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs

Pontosphaera discopora

References:

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