Trochoaster martinii


Ancestry: Coccolithophores -> Nannolith families inc sed -> Lithostromationaceae -> Lithostromation -> Trochoaster martinii
Sister taxa: L. biconvexitas, L. operosum, L. perdurum, L. simplex, L. sp., T. martinii,

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


Taxonomy:

Citation: Trochoaster martinii Best & Müller 1972
Rank: Species
Notes & discussion: This seems to be a discrete form, but should be recombined in Lithostromation if used.

Farinacci & Howe catalog pages: Trochoaster martinii *

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


Ecology & Biogeography: Described from low diversity, low salinity deposits

Search data:
TagsLITHS: nannolith-radiate, hexagonal, star-shaped,
CSPH: not known, V-UNITS: all, R-UNITS: none, DETAILS: 1ou,
MetricsLith size: 10->15µm; Segments: 6->6;
Sources: lith size from ODs & 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 Early Miocene Sub-Epoch (15.97-23.03Ma, top in Burdigalian stage). Data source: original description
First occurrence (base): within Early Miocene Sub-Epoch (15.97-23.03Ma, base in Aquitanian stage). Data source: original description

Plot of occurrence data:

References:

Best, G. & Müller, C., (1972). Nannoplankton-Lagen im Unter-Miozan von Frankfurt am Main. Senckenbergiana lethaea, 53(1/2): 103-117.

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Trochoaster martinii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2017

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Ines Galovic (CGS, Croatia)
It looks like Actiniscus pentasterias (Ehrenberg) Ehrenberg.
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Jeremy Young (UCL, UK)
Indeed Actiniscus and Trochoaster can look really similar in SEM - but of course in LM there is no problem to separate them, as Actiniscids are siliceous
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