Nannotax3 - ntax_mesozoic - Gartnerago costatum

Gartnerago costatum


Classification: ntax_mesozoic -> Arkhangelskiales -> Kamptneriaceae -> Gartnerago -> Gartnerago costatum
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: Similar to G. obliquum but pores larger and with cross-bars within them


Sub-taxa & variants (time control age-window is: 0-800Ma)
Gartnerago costatum subsp. costatum
perforations with 1 cross-bar
Gartnerago costatum subsp. porolatum
perforations broad with 2 to 3 cross-bars

Taxonomy:

Citation: Gartnerago costatum (Gartner, 1968) Bukry, 1969
Rank: Species
Basionym: Arkhangelskiella costata Gartner, 1968

Farinacci & Howe catalog pages: A. costata *

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: Similar to G. obliquum but pores larger and with cross-bars within them


Morphology: The cross bars at the base of the pores run parallel with the axes of the cross.

Search data:
TagsLITHS: placolith, elliptical, CA: plate, pores, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith 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

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Burnett (1998)
First occurrence (base): within Santonian Stage (83.64-86.26Ma, base in Santonian stage). Data source: Burnett (1998)

Plot of occurrence data:

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs V O

Gartner, S. (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles. 48 (Protista 1): 1-56. 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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Gartnerago costatum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-11-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10459 Go to Archive.is to create a permanent copy of this page - citation notes



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