arrayname: original
Taxonomy:
Distinguishing features:
Parent taxon (Lithostromation): Triangular to stellate nannoliths with porous structure formed from small crystallites. All show 3-fold symetry but with a wide range of forms.
This taxon: 6 long free rays at two levels, porous
Farinacci & Howe catalog pages: M. reginus *
"This species has six long, slender rays arranged in the same pattern as the playing pieces for the children's game of jacks. There are six knobs at the termination of each ray. The surface is covered with circular depressions which are surrounded by hexagonal, knobby ridges. The perforations become more shallow and more oval toward the ray ends. L. reginum is similar to Marthasterites spineus Shafik and Stradner, which is distinguished by its lack of terminal nodes and the presence of small projections on either side of each ray." [Bybell 1975]
Morphology:
See also: Imperiaster obscurus ;
Search data:LITHS: nannolith-radiate, star-shaped, CA: pores, CROSS-POLARS: V-prominent, 1ou, |
Lith size: 0->0µm; |
Geological Range:
Notes:
Last occurrence (top): at top of Middle Eocene Sub-Epoch (100% up, 37.8Ma, in Bartonian stage). Data source: Bybell 1975
First occurrence (base): at top of Early Eocene Sub-Epoch (100% up, 47.8Ma, in Lutetian stage). Data source: Stradner 1962
Plot of occurrence data:
Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs O Stradner, H. (1962). Über neue und wenig bekannte Nannofossilien aus Kreide und Alttertiär. Verhandlungen der Geologischen Bundesanstalt (Wien). 2: 363-377. gs References:
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Lithostromation reginum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-4-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=825 Go to Archive.is to create a permanent copy of this page - citation notes |
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