Stradnerlithus fragilis


Classification: ntax_mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Stradnerlithus -> Stradnerlithus fragilis
Sister taxa: S. helotatus, S. primitus, S. geometricus, S. fractus, S. bifurcatus, S. langii, S. tortuosus, S. asymmetricus, S. escovillensis, S. fragilis, S. callomonii, S. comptus, S. clatriatus, S. wendleri, S. haynesiae, S. silvaradius, S. sp.

Distinguishing features: Gracile Stradnerlithus with central area spanned by 8 radial bars.


Taxonomy:

Citation: Stradnerlithus fragilis (Rood & Barnard, 1972) Perch-Nielsen, 1984
Rank: Species
Basionym: Actinozygus fragilis Rood & Barnard, 1972
Variants: Stradnerlithus braloweri Rahman & Roth (1991) - normally elliptical (typical S. fragilis is lenticular)

Farinacci & Howe catalog pages: A. fragilis * , S. braloweri *

Distinguishing features: Gracile Stradnerlithus with central area spanned by 8 radial bars.


Morphology: Typically lenticular (i.e with slightly pointed ends) and without a bar running to the ends of the coccolith

Search data:
TagsLITHS: murolith, elliptical, CA: ca_disjunct, grill, process, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 2.5->4µm;
Data source notes: 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 NJ17b subzone (148.35-149.09Ma, top in Tithonian stage). Data source: Bown & Cooper 1998
First occurrence (base): within NJ13 zone (163.64-164.79Ma, base in Callovian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Grün, W. & Zweili, F. (1980). Das kalkige Nannoplankton der Dogger-Malm-Grenze im Berner Jura bei Liesberg (Schweiz). Jahrbuch der Geologischen Bundesanstalt. 123: 231-341. gs V O

Medd, A. W. (1979). The Upper Jurassic coccoliths from the Haddenham and Gamlingay boreholes (Cambridgeshire, England). Eclogae Geologicae Helvetiae. 72: 19-109. gs V O

Perch-Nielsen, K. (1984b). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs V O

Rahman, A. & Roth, P. H. (1991). Upper Jurassic calcareous nannofossils from the DSDP Site 534 in the Blake Bahama Basin, western North Atlantic. Eclogae Geologicae Helvetiae. 84: 765-789. gs V O

Rood, A. P. & Barnard, T. (1972). On Jurassic coccoliths: Stephanolithion, Diadozygus and related genera. Eclogae Geologicae Helvetiae. 65: 327-342. gs V O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs V O

Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs V O


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Stradnerlithus fragilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-5-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11174 Go to Archive.is to create a permanent copy of this page - citation notes



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