Lithostromation


Classification: Coccolithophores -> Nannolith families inc sed -> Lithostromationaceae -> Lithostromation
Sister taxa: Lithostromation, Imperiaster, Lacunolithus, Martiniaster, Isolithus,

Daughter taxa: (blue => in age window 0-800Ma)
Ellipsoidal cenrral body with ends extended as spines
Medium-sized (5-10 µm), sub-circular
Large, triangular nannoliths with porous structure formed from small crystallites.
Hexagonal, perforate nannolith with low birefringence. Six thin rays extend a short distance beyond the margin of hexagonal disc with numerous pores. Secondary shorter rays are present between each of the longer rays, which terminate at the disc edge.

Hexradiate with distinct free rays, all 6 rays similar,  ridge runs along length of rays

Taxonomy:

Citation: Lithostromation Deflandre, 1942
Rank: Genus
Type species: Lithostromation perdurum Deflandre, 1942
Synonyms:

Distinguishing features: Triangular to stellate nannoliths with porous structure formed from small crystallites.

Farinacci & Howe catalog pages: Lithostromation * , Trochoaster * , Polycladolithus * , Trochastrites *


Size: Most illustrated specimens and described species are 10-15 µm across, except for L. operosum which is  smaller, 5-10 µm

Ecology & Biogeography: Typically confined to epicontinental areas.

Search data:
TagsLITHS: nannolith-radiate, rosette-shaped,
CSPH: not known, V-UNITS: all, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 5->15µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in mid part of Ionian Stage (52% up, 0.4Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Ypresian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Deflandre, G. (1942). Coccolithophoridés fossiles d'Oranie. Genres Scyphosphaera Lohmann et Thorosphaera Ostenfeld. Société d'Histoire Naturelle de Toulouse; Bulletin. 77: 125-137. gs

Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs

Klumpp, B. (1953). Beitrag zur Kenntnis der Mikrofossilien des Mittleren und Oberen Eozän. Palaeontographica A. 103: 377-406. gs

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


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Lithostromation compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=820 Go to Archive.is to create a permanent copy of this page - citation notes



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