Daughter taxa (time control age-window is: 0-800Ma)![]() | |||||
3 free rays | |||||
![]() | ![]() | Lithostromation hohnensis 3 co-planar narrow, bifurcate rays, medium size (8-11 µm) | |||
![]() | ![]() | ![]() | ![]() | Lithostromation pyramidale Pyramidal - 3 co-planar bifurcate rays and a fourth perpendicular | |
![]() | ![]() | ![]() | ![]() | Trochoaster tripartitus 3 co-planar broad, bifurcate rays, large size (12-22 µm) | |
6 free rays | |||||
Lithostromation martinii Hexaradiate with distinct free rays, all 6 rays similar, ridge runs along length of rays | |||||
![]() | ![]() | ![]() | Lithostromation nodosum Like L. martinii, but with more complex central structure | ||
Lithostromation obscurum 6 long free rays at two levels, smooth/solid | |||||
Lithostromation reginum 6 long free rays at two levels, porous | |||||
without free rays | |||||
Lithostromation operosum Medium-sized (5-10 µm), sub-circular | |||||
![]() | ![]() | Lithostromation perdurum Large, triangular nannoliths with porous structure formed from small crystallites. | |||
![]() | ![]() | Lithostromation simplex 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. | |||
![]() | ![]() | ![]() | Lithostromation biconvexitas Ellipsoidal central body with ends extended as spines | ||
Lithostromation sp. |
Taxonomy:
Distinguishing features:
Parent taxon (Lithostromationaceae): Large (10-20µm) triangular to stellate nannoliths with porous structure formed from small crystallites. In xpl behave as single crystal unit with low birefringence
This taxon: Triangular to stellate nannoliths with porous structure formed from small crystallites. All show 3-fold symetry but with a wide range of forms.
Farinacci & Howe catalog pages: Lithostromation * , Trochoaster * , Polycladolithus * , Trochastrites * , Imperiaster *
Size:
Ecology & Biogeography
LITHS: nannolith-radiate, star-shaped, CA: pores, CROSS-POLARS: 1ou, V-prominent, |
Lith size: 5->15µm; |
Geological Range:
Last occurrence (top): at top of NN19 zone (100% up, 0.4Ma, in Ionian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Early Eocene Sub-Epoch (47.84-55.96Ma, base in Ypresian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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. (1942b). Possibilitès morphogénétiques comparées du calcaire et de la silice, à propos d'un nouveau type de microfossile calcaire de structure complexe, Lithostromation perdurum n. g. n. sp. Comptes rendus hebdomaire de l'Académie des sciences, Paris. 214: 917-920. 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 Abteilung A Palaeozoologie Stratigraphie. 103: 377-406. gs Martini, E. (1970). Imperiaster n. g. aus dem europäischen Unter-Eozän (Nannoplankton, incertae sedis). Senckenbergiana Lethaea. 51: 383-386. 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. gsReferences:
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Lithostromation compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-6-2025
Short stable page link: https://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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