Nannotax3 - ntax_mesozoic - Gartnerago diversum

Gartnerago diversum


Classification: ntax_mesozoic -> Arkhangelskiales -> Kamptneriaceae -> Gartnerago -> Gartnerago diversum
Sister taxa: G. obliquum, G. segmentatum, G. costatum, G. diversum ⟩⟨ G. stenostaurion, G. clarusora, G. waszczakii ⟩⟨ G. chiasta, G. margaritatus, G. praeobliquum ⟩⟨ G. coxalliae, G. nanum, G. ponticula, G. theta, G. sp.

Distinguishing features:
Parent taxon (Gartnerago): Tiered coccoliths with distinctive LM images consisting of a narrow to moderately-broad rim with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; and a dark, inner-cycle. Central-area structures variable but generally dark in LM.
This taxon: Gartnerago with protruding axial bars; perforations small, with a double row of perforations on each side of the cross-bars, with others randomly distributed


Taxonomy:

Citation: Gartnerago diversum Thierstein in Roth & Thierstein, 1972
Rank: Species
Taxonomic discussion: The diagnosis of Thierstein appears to be missing a sentence describing the arrangement of the perforations. They are, however, visible on his images. 
Thierstein (1974) included G. diversum in G. striatum (Stradner) and included any specimens with multiple perforations "central area with more than one row of perforations along each side of the axial sutures = Arkhangelskiella striata Stradner type". The holotpye of striatum is now known to be a cretarhabdid so the name diversum is the valid name for the morphotype, if it is separated from G. obliquum.

Farinacci & Howe catalog pages: G. diversum *

Distinguishing features:
Parent taxon (Gartnerago): Tiered coccoliths with distinctive LM images consisting of a narrow to moderately-broad rim with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; and a dark, inner-cycle. Central-area structures variable but generally dark in LM.
This taxon: Gartnerago with protruding axial bars; perforations small, with a double row of perforations on each side of the cross-bars, with others randomly distributed


Morphology:


Size:
The original description gives a size range of 10-24 µm but illustrated specimens are no bigger than 12 µm


Ecology & Biogeography


Biology & life-cycles

Phylogenetic relations

Search data:
LITHS: placolith, elliptical, CA: plate, pores, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 7->12µm;
Data source notes: illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

See also: Crucicribrum anglicum - similar but with few lager pores, axial cross and in some specimens a central spine;

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: original description
First occurrence (base): within Cenomanian Stage (93.90-100.50Ma, base in Cenomanian stage). Data source: original description

Plot of occurrence data:

References:

Pospichal, J. J. & Wise, S. W. (1990b). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs V O

Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs O

Thierstein, H. R. (1974). Calcareous nannoplankton - Leg 26, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 26: 619-667. 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 O


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Gartnerago diversum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-11-2022

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10463 Go to Archive.is to create a permanent copy of this page - citation notes



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