Darwinilithus


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Darwinilithus
Sister taxa: Corollithion, Cylindralithus, Darwinilithus, Paralithella, Rectocorona, Rhombolithion, Rotelapillus, Stephanolithion, Stoverius, Stradnerlithus, Thurmannolithion, Truncatoscaphus,

Distinguishing features: Cylindrical nannofossil with median flange, a flaring cone on one side and a circlet of flaring spines on the other


Daughter taxa: (blue => in age window 0-800Ma)

Specimens not identified to species level

Taxonomy:

Citation: Darwinilithus Watkins in Watkins & Bowdler, 1984
Rank: Genus
Type species: Darwinilithus pentarhethum Watkins in Watkins & Bowdler, 1984

Farinacci & Howe catalog pages: Darwinilithus *

Distinguishing features: Cylindrical nannofossil with median flange, a flaring cone on one side and a circlet of flaring spines on the other


Morphology remarks: Watkins & Bowdler (1984) interpret the conical side as distal and the spinose side as proximal. LM observations (see colour image from Kevin Cooper) indicate that the flange and cone are both V-units and the spines R-units. This supports the interpretation of Watkins & Bowdler that this is a Stephanolithid, with the cone being distal.

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: Total of range of species in this database
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

Watkins, D.K. & Bowdler, J.L., (1984). Cretaceous calcareous nannofossils from Deep Sea Drilling Project Leg 77, southeast Gulf of Mexico. Initial Reports of the Deep Sea Drilling Project, 77: 649-674.


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Darwinilithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2019

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