Nannotax3 - ntax_cenozoic - Praeprinsius tenuiculus

Citation: Praeprinsius tenuiculus (Okada&Thierstein, 1979) Varol & Jakubowski 1989

Basionym: Biscutum? tenuiculum Okada & Thierstein (1979)

Synonyms:

Prinsius tenuiculus (Okada and Thierstein, 1979) Perch-Nielsen, 1984
Prinsius africanus Perch-Nielsen, 1981
= Toweius africanus (Perch-Nielsen, 1981) Perch-Nielsen, 1984
Prinsius rosenkrantzii Perch-Nielsen, 1979 NB In a note in the INA Newsletter (NINA 2/1 p.34, 1980) van Heck states that "According to K. Perch-Nielsen, this species [P. rosenkrantzii] is a junior synonym (by a few months) of Biscutum tenuiculum Okada & Thierstein 1979".

Taxonomic discussion: This species has been included in P. dimorphosus by some workers, and previously on Nannotax, but these circular forms appear to be consistently separable from elliptical P. dimorphosus.

Distinguishing features:
Parent taxon (Praeprinsius): Very small to small (1-4 µm), circular to sub-circular, coccospheres with numerous coccoliths
This taxon: Very small to small circular to subcircular placoliths with narrow, but distinct, central opening (‘bullseye’).

A grill is sometimes visible on the proximal side in well-preserved .

Type material 1.4-4 µm; Perch-Nielsen (1985) describes it as being larger (4-6µm).

Geological Range:
Notes: Bown et al 2023, distinguish the small early forms of this lineage as P. vegrandis and so exclude P. tenuiculus specimens frm NP1.
Last occurrence (top): at top of NP3 zone (100% up, 63.3Ma, in Danian stage). Data source: Bown et al. 2023
First occurrence (base): near base of NP2 zone (10% up, 65.4Ma, in Danian stage). Data source: Bown et al. 2023

References:

Alvarez, S. A., Gibbs, S. J., Bown, P. R., Kim, H., Sheward, R. M. & Ridgwell, A. (2019). Diversity decoupled from ecosystem function and resilience during mass extinction recovery. Nature. 574: 242-248. gs

Bown, P. R., Kim, H. & Gibbs, S. J. (2023). Danian calcareous nannofossil evolution and taxonomy with focus on sites from the North Atlantic Ocean (IODP Expedition 342, Sites U1403 and U1407). Journal of Nannoplankton Research. 41(2): 110-157. gs 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 O

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

Perch-Nielsen, K. (1979). 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 O

Perch-Nielsen, K. (1981). 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 O

Perch-Nielsen, K. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs

Perch-Nielsen, K. (1985). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge (1): 427-555. gs

Pospichal, J. J. & Wise, S. W. (1990). 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

Varol, O. & Jakubowski, M. (1989). Some new nannofossil taxa. INA Newsletter. 11(1): 24-29. gs

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

Praeprinsius tenuiculus

References:

Add Comment

Comments