Prinsius dimorphosus


Classification: ntax_cenozoic -> Isochrysidales -> Prinsiaceae -> Prinsius -> Prinsius dimorphosus
Sister taxa: P. dimorphosus, P. tenuiculus, P. martinii, P. bisulcus, P. sp.

Taxonomy:

Citation: Prinsius dimorphosus (Perch-Nielsen, 1969) Perch-Nielsen, 1977
Rank: Species
Basionym: Biscutum dimorphosum Perch-Nielsen, 1969
Synonyms:
Taxonomic discussion: The name dimorphosus referred to observation of coccospheres with a mix of coccoliths with either a simple tube-cycle or a double tube-cycle. Subsequently Okada & Thierstein (1979) separated their species tenuiculus from dimorphosus based on coccolith outline - (sub)circular vs elliptical. This differentiation was compatible with the type specimens of Perch-Nielsen (1969) and has been widely followed.

Distinguishing features: Very small, elliptical to subcircular placoliths with narrow to closed central area.

Original description: [Translated description - from Google translate with edits - JRY 2019]
Diagnosis: Elliptical coccoliths with a distal marginal wall of juxtaposed to slightly overlapping elements and a central field filled with one or two layers of elements. Basal side unknown.
The coccosphaere consists of about 8-14 mutually overlapping coccoliths of different or the same structure.

Description: The distal shield is made up of approximately 12-15 wide, marginal elements that are adjacent to each other or overlap slightly. The central field of the coccolith is filled in one form by a number of large crystals of different size and shape, while in other coccoliths a ring of other elements is interposed between these central elements and the marginal elements. These are arranged in such a way that only one corner in each case protrudes under the central elements, similar to a serrated collar. The coccosphere consists of 8-14 coccoliths of one or the other form, or both forms, and has the shape of a flattened sphere. The coccoliths overlap each other quite strongly.

Basal sides of the coccoliths could not be determined with certainty. The simpler form is not found as a single coccolith, and although the three-step form is not uncommon as single coccoliths, it appears that it is mostly sedimented on the formvar film in such a way that only the distal side is visible

Farinacci & Howe catalog pages: B. dimorphosum *

Most likely ancestor: Prinsius tenuiculus - at confidence level 3 (out of 5). Data source: Okada & Thierstein 1979 (p. 521).
Likely descendants: Prinsius martinii;

Search data:
TagsLITHS: placolith, circular, elliptical, CA: ca_conjunct, vacant, closed,
CSPH: equant, BC-dimorphic, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 2->3.5µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP4 zone (61.51-63.25Ma, top in Selandian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): in upper part of NP2 zone (60% up, 65.1Ma, in Danian stage). Data source: Varol, 1989, fig. 12.4

Plot of occurrence data:

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs

Mai, H., von Salis, K., Willems, H. & Romein, A. J. T. (1997a). Fossil coccospheres from the K/T boundary section from Geulhemmerberg, The Netherlands. Micropaleontology. 43(281-302): -. gs

Mai, H., Hillebrandt-Habel, T., von Salis Perch-Nielsen, K. & Willems, H. (1998). Paleocene coccospheres from DSDP Leg 39, Site 356, Sao Paulo Plateau, S. Atlantic Ocean. Journal of Nannoplankton Research. 20(1): 21-29. gs V O

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O

Perch-Nielsen, K. (1969b). Elektronenmikroskopische Untersuchungen der Coccolithophoriden der Dan-Scholle von Katharinenjof (Fehmarn). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 132: 317-332. gs

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

Perch-Nielsen, K. (1977a). 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 V O

Perch-Nielsen, K. (1979a). Calcareous nannofossil zonation at the Cretaceous/Tertiary boundary in Denmark. In, Birkelund, T. & Bromley, R. G. (eds) Proceedings Cretaceous-Tertiary Boundary Events Symposium, Copenhagen, 1. Copenhagen 115-135. gs

Perch-Nielsen, K. (1981b). New Maastrichtian and Paleocene calcareous nannofossils from Africa, Denmark, and USA and the Atlantic, and some Paleocene lineages. Eclogae Geologicae Helvetiae. 74(3): 831-863. gs V O

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

Pospichal, J. J. & Wise, S. W. (1990a). Calcareous nannofossils across the K/T boundary, ODP hole 690C, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 515-532. gs V O

Pospichal, J. J. & Wise, S. W. (1990c). Paleocene to Middle Eocene calcareous nannofossils of ODP sites 689 and 690, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 613-638. gs V O

Varol, O. & Jakubowski, M. (1989). Some new nannofossil taxa. INA Newsletter. 11: 24-29. gs V O

Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series. 265-310. gs V O

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


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Prinsius dimorphosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

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