Ilselithina iris

Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed -> Ilselithina -> Ilselithina iris
Sister taxa: I. fusa, I. iris, I. sp.


Citation: Ilselithina iris Stradner in Stradner and Adamiker, 1966
Rank: Species
Synonyms: Hayella elegans Roth 1968 (cf. Roth in Baumann and Roth, 1969)

Distinguishing features: Proximal shield with slits between the elements; distal shield elements robust, tips touch.

Farinacci & Howe catalog pages: I. iris * , H. elegans *

Morphology: Minute (~2-3µm), circular heterococcoliths with a conical proximal shield with slits between the elements and elevated distal cycle of 5-12 long, radial spokes with small bulbs at the ends (like flower anthers) tilted outwards at about 45 degrees.

Size: 2-3µm

Search data:
TagsLITHS: placolith, circular, CA: vacant, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 2->3µm;
Data source notes: lith size from ODs
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP21 zone (32.92-34.44Ma, base in Priabonian stage). Data source: [PRB rough estimate]

Plot of occurrence data:


Baumann, P. & Roth, P. H. (1969). Zonierung des Obereozans und Oligozans des Monte Cagnero (Zentralappennin) mit planktonischen Foraminiferen und Nannoplankton. Eclogae Geologicae Helvetiae. 62: 303-323. gs V O

Stradner, H. & Adamiker, D. (1966). Nannofossilien aus Bohrkernen und ihre elektronenmikroskopische Bearbeitung. Erdoel-Erdgas Zeitschrift. 82: 330-341. gs


Ilselithina iris compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-2-2021

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