CATALOG - Micrantholithus mirabilis

Folder trail: ntax_Farinacci -> M -> Micrantholithus -> Micrantholithus mirabilis
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Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was compiled by Prof A. Farinacci 1969-1989 and updated by Richard Howe 2000-2016 - see also this page.
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Current identification/main database link: Micrantholithus mirabilis Locker 1965

Compiled data

Citation: Micrantholithus mirabilis Locker 1965
Rank: Species
Type locality: Germany
Type age (chronostrat): Lower Eocene
Standardised type level: 101_LOWER EOCENE
Type repository: Berlin Univ - Mikropal Lab
Repository Country: Germany
Farinacci catalog page (& compiler): 7159
Language: DE
Current citation: Micrantholithus mirabilis Locker 1965

Editors' Notes
"German description: Pentalithen mit einzelteilen, die ohne die langen Fortsätze einen herzformigen Umriss haben. Die Einzelteile sind, von der einen Flachseite her betrachtet, im zentralen Teil stark verdickt, so dass die langen Fortsatze in einer anderer optischen Eben liegen. Die Fortsätze konnen stark gedreht sein, im Extremfalle so, dass alle im gleichen Sinne nach einer Seite verwunden sind. Manche Segmenten können zwei Fortsätze tragen, andere keinen. Die Nahtlinien erscheinen, durch die dicke des Zentralteiles bedingt, mehr oder weniger geschwungen.
Durchmesser 12-21 µm; korrodiert, das heisst ohne langen Fortsätze, 5 µm
Beziehungen: M. mirabilis unterscheidet sich von M. bramlettei, mit dem er nahe verwandet sein Dürfte, durch die aberrante Form der Einzelteile, insbesondere aber dadurch, dass Strahlen und Zentralfeld, von der einen Flachseite her betrachtet, nicht in einer optischen Ebene liegen"

Google translate: Pentaliths with component parts that have a heart-shaped outline without the long extensions. The items are viewed from the flat side, 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 seam lines appear, through the thickness of the central part due to more or less curved.

Diameter 12-21 microns; corroded , ie without long appendages 5 microns

Relationships : M. mirabilis differs from M. bramlettei , with whom the metamorphosing near should be, by the aberrant form of the items , but in particular the fact that rays and central field of looking at a flat side does not lie in one optical plane


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


Micrantholithus mirabilis: Catalog entry compiled by Anna Farinacci. Viewed: 13-6-2021

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