Isthmolithus recurvus


Classification: ntax_cenozoic -> Zygodiscales -> Zygodiscaceae -> Isthmolithus -> Isthmolithus recurvus
Sister taxa: I. recurvus, I. rhenanus, I. unipons, I. sp.

Taxonomy:

Citation: Isthmolithus recurvus Deflandre in Deflandre and Fert, 1954
Rank: Species
Variants: Isthmolithus triplus Levin & Joerger 1967 - thicker walled and more rectangular, possibly just overgrown I. recurvus
Taxonomic discussion: Only consistently reported and common species in the genus.

Distinguishing features: Narrowly elliptical to oblong (or parallelogram-like), relatively high muroliths with two parallel transverse bars.

Farinacci & Howe catalog pages: I. recurvus * , I. triplus *

Search data:
TagsLITHS: murolith, elliptical, quadrate, CA: ca_conjunct, pores, bar, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 6->10µm;
Data source notes: lith size from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP22 zone (32.02-32.92Ma, top in Rupelian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): at base of NP19-20 zone (0% up, 37Ma, in Priabonian stage). Data source: zonal marker (see Perch-Nielsen 1985)

Plot of occurrence data:

References:

Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Fioroni, C., Villa, G., Persico, D., Wise, S. W. & Pea, L. (2012). Revised middle Eocene-upper Oligocene calcareous nannofossil biozonation for the Southern Ocean. Revue de Micropaléontologie. 55(2): 53-70. gs

Levin, H. L. & Joerger, A. P. (1967). Calcareous nannoplankton from the Tertiary of Alabama. Micropaleontology. 13(2): 163-182. 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

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

Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs

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

Wei, W. & Wise, S. W. (1990b). Middle Eocene to Pleistocene calcareous nannofossils recovered by Ocean Drilling Program leg 113 in the Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 639-666. gs V O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs V O

Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs V O


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Isthmolithus recurvus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-4-2021

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