Nannotax3 - ntax_cenozoic - Micrantholithus mirabilis

Micrantholithus mirabilis

Classification: ntax_cenozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Micrantholithus -> Micrantholithus mirabilis
Sister taxa: M. breviradiatus, M. disculus, M. flos ⟩⟨ M. astrum, M. entaster, M. excelsus, M. hebecuspis, M. minimus, M. pinguis, M. vesper ⟩⟨ M. attenuatus, M. mirabilis ⟩⟨ M. angulosus, M. bramlettei, M. bulbosus, M. crenulatus, M. tinus, M. sp.


Citation: Micrantholithus mirabilis Locker 1965
Rank: Species
Synonyms: Micrantholithus lateralis Sullivan (1965) [this appears to be a very similar taxon, and possibly it is a senior synonym (the precise publication dates need checking) - JRY 2016]

Distinguishing features:
Parent taxon (Micrantholithus): Pentaliths with sutures emerging through corners; edge often indented giving stellate outline
This taxon: Micrantholithus with thickened central area and long extensions formed typically by single segments.

Farinacci & Howe catalog pages: M. mirabilis * , M. lateralis *

Morphology: Translation of the original description: Pentaliths with segments that have a heart-shaped outline, without the long extensions. The segments are strongly thickened in the central part, so that the long projections lie in another optical plane. The extensions can be rotated significantly, in the extreme case so that all are twisted in the same direction to one side. Some segments may carry two extensions, others not . The suture lines appear to be more or less curved through the thickness of the central part.

See also: Pentaster lisbonensis - possibly the same taxon but better preserved.;

Search data:
TagsLITHS: nannolith-radiate, pentagonal, star-shaped, CA: process, CROSS-POLARS: T-prominent,
MetricsLith size: 12->30µm; Segments: 5->5; Liths per sphere: 12->12
Data source notes: lith size (diameter) from ODs & illustrated specimens; lith numbers assumed from geometry
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Early Eocene Sub-Epoch (47.84-55.96Ma, top in Ypresian stage). Data source: original description
First occurrence (base): within Early Eocene Sub-Epoch (47.84-55.96Ma, base in Ypresian stage). Data source: original description

Plot of occurrence data:


Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O

Chang, K. H. (1969). Several new species of middle and upper Eocene nannoplankton related with Micrantholithus parisiensis Bouché. Journal of the Geological Society of Korea. 5: 145-155. gs

Locker, S. (1965). Coccolithophoriden aus Eozanschollen Mecklenburgs. Geologie, Berlin. 14(10): 1252-1265. gs

Perch-Nielsen, K. (1968b). Beobachtungen im elektronenmikroskop an Micrantholithus mirabilis und Marthasterites obscurus (Nannoplankton). Meddelelser fra Dansk Geologisk Forening. 18(2): 251-254. gs

Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs V O

Steurbaut, E. (1990). Ypresian calcareous nannoplankton biostratigraphy and palaeogeography of the Belgian Basin. Bulletin de la Société Belge de Géologie. 97(1988): 251-285. gs

Sullivan, F. R. (1965). Lower Tertiary nannoplankton from the California Coast Ranges. II. Eocene. University of California Publications in Geological Sciences. 53: 1-74. gs

Varol, O. (1998). Palaeogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 200-224. gs


Micrantholithus mirabilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2021

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics