Retecapsa schizobrachiata


Classification: Mesozoic -> Podorhabdales -> Cretarhabdaceae -> Retecapsa -> Retecapsa schizobrachiata
Sister taxa: R. incompta, R. angustiforata, R. beckii, R. octofenestrata, R. schizobrachiata, R. crenulata, R. surirella, R. escaigii, R. ficula, R. sp.,

Distinguishing features: Cretarhabdids with axial cross & 1 lateral bar per quadrant located towards the tips of the cross; central area relatively broad. The 8 central area holes are of unequal size. Medium to large (5-11 µm).


Taxonomy:

Citation: Retecapsa schizobrachiata (Gartner, 1968) Grün in Grün and Allemann, 1975
Rank: Species
Basionym: Vekshinella schizobrachiata Gartner, 1968
Variants:
Synonyms:

Farinacci & Howe catalog pages: Vekshinella schizobrachiata * , Retecapsa levis * , Retecapsa tridentata *

Distinguishing features: Cretarhabdids with axial cross & 1 lateral bar per quadrant located towards the tips of the cross; central area relatively broad. The 8 central area holes are of unequal size. Medium to large (5-11 µm).

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, grill, process, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 5->11µm;
Sources: original descriptions & illustrated specimens - big speciemsn (>8 µm) mostly from Campanian & Maastrichtian.
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: There appear to be two sets of occurrences recorded: 

Possibly two separate species are involved, in whichcase the Jurassic form should be called R. tridentata. However, note that R. angustiforata occurs in the intervening interval, and is distinguised only by having more prominent lateral bars, and a very large calyx  [my interpretation - JRY 2018]
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within Early Callovian Substage (164.63-166.07Ma, base in Callovian stage). Data source: Bown & Cooper 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Retecapsa schizobrachiata, synonyms included - Cretarhabdus schizobrachiatus; Retecapsa schizobrachiata;
  • space-time plot :: Samples map :: Parent: Retecapsa

    References:

    Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs :: view :: open

    Black, M. (1971). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs :: ::

    Black, M. (1972). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48. gs :: ::

    Blair, S. A. & Watkins, D. K. (2009). High-resolution calcareous nannofossil biostratigraphy for the Coniacian/Santonian Stage boundary, Western Interior Basin. Cretaceous Research. 30(2): 367-384. gs :: ::

    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 :: ::

    Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs :: ::

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

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs :: ::

    Gartner, S. (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. The University of Kansas Paleontological Contributions. Article 48 (Protista 1): 1-56. gs :: ::

    Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs :: view :: open

    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 :: ::

    Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs :: ::

    Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. gs :: view :: open

    Shafik, S. & Stradner, H. (1971). Nannofossils from the Eastern Desert, Egypt. Jahrbuch der Geologischen Bundesanstalt Sonderband. 17: 69-104. gs :: ::

    Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs :: view :: open

    Verbeek, J. W. (1977). Calcareous nannoplankton biostratigraphy of Middle and Upper Cretaceous deposits in Tunisia, southern Spain and France. Utrecht Micropaleontological Bulletin. 16: 1-157. gs :: ::

    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 :: view :: open


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    Retecapsa schizobrachiata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11004 Go to Archive.is to create a permanent copy of this page - citation notes



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