Reticulofenestra dictyoda


Classification: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. umbilicus group -> Reticulofenestra dictyoda
Sister taxa: R. umbilicus, R. dictyoda, R. hillae, R. hampdenensis, R. hesslandii, R. moorei, R. circus, R. circus var. lata, R. wadeae, R. maceria Shafik 1989, R. oamaruensis,

Taxonomy:

Citation: Reticulofenestra dictyoda (Deflandre in Deflandre & Fert, 1954) Stradner in Stradner & Edwards, 1968
Rank: Species
Basionym: Discolithus dictyodus Deflandre in Deflandre & Fert, 1954
Synonyms: Arguably
Notes & discussion: There is much morphological variability within this group, including degree of ellipticity/circularity, size of central area and width of tube cycle. A broad species concept is often applied.
In the Neogene the name R. pseudoumbilicus is used in the virtually same sense and can appear essentially identical.

Distinguishing features: Small to very large (3-14 µm), elliptical reticulofenestrids with open central area spanned by net

Farinacci & Howe catalog pages: Discolithus dictyodus * , Apertapetra samodurovi * , Reticulofenestra caucasica * , Coccolithus coenurus * , Reticulofenestra clatrata * , Reticulofenestra donghaiensis * , Reticulofenestra insignita *


Size: Holotype length 5.6-6.6 microns

Search data:
TagsLITHS: placolith, elliptical, CA: grill, vacant,
CSPH: spherical, monomorphic, V-UNITS: none, R-UNITS: all, c-str, distal shield, prox shield, tube, DETAILS: ca_conjunct, isogyres kinked, isogyres oblique, rim-unicyclic,
MetricsLith size: 3->14µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Oligocene Epoch (23.03-33.89Ma, top in Chattian stage). Data source: [JRY rough estimate]
First occurrence (base): within NP13 zone (49.11-50.50Ma, base in Ypresian stage). Data source: Perch-Nielsen 1985

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: Reticulofenestra dictyoda, synonyms included - Cribrocentrum coenurum; Cribrocentrum coenurym; Dictyococcites dictyodus; Reticulofenestra caucasia; Reticulofenestra caucasica; Reticulofenestra clatrata; Reticulofenestra coenura; Reticulofenestra coenurum; Reticulofenestra dictyoda; Reticulofenestra donghaiensis; Reticulofenestra gartneri; Reticulofenestra insignata; Reticulofenestra samodurevi; Reticulofenestra samodurovi; Reticulofenestra samodurovii; Reticulofenestra samofurovii; Reticulofenestra umbilica (<14 micron); Reticulofenestra dictyoda (3-10µm);
  • space-time plot :: Samples map :: Parent: R. umbilicus group

    References:

    Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs

    Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs

    Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs

    Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs

    Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

    Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gs

    Fioroni, C., Villa, G., Persico, D., Wise, S. W. & Pea, L. (2012). Revised middle Eocene-upper Oligocene calcareous nannofossil biozonation for the Southern Ocean. Revue de Micropaléontologie. 55(2): 53-70. gs

    Fioroni, C., Villa, G., Persico, D. & Jovane, L. (2015a). Middle Eocene-Lower Oligocene calcareous nannofossil biostratigraphy and paleoceanographic implications from Site 711 (equatorial Indian Ocean). Marine Micropaleontology. 118: 50-62. gs

    Hay, W. W., Mohler, H. P. & Wade, M. E. (1966). Calcareous nannofossils from Nal'chik (northwest Caucasus). Eclogae Geologicae Helvetiae. 59: 379-399. gs

    Hay, W. W., Mohler, H. P., Roth, P. H., Schmidt, R. R. & Boudreaux, J. E. (1967). Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. Transactions of the Gulf Coast Association of Geological Societies. 17: 428-480. gs

    Müller, C. (1970b). Nannoplankton-Zonen der Unteren-Meeresmolasse Bayerns. Geologica Bavarica. 63: 107-118. gs

    Perch-Nielsen, K. (1971b). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter. Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs

    Perch-Nielsen, K. (1977). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs

    Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

    Reinhardt, P. (1966a). Fossile Vertreter coronoider und styloider Coccolithen (Family Coccolithaceae Poche 1913). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 8: 513-524. gs

    Roth, P. H. (1970). Oligocene calcareous nannoplankton biostratigraphy. Eclogae Geologicae Helvetiae. 63: 799-881. gs

    Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs

    Shepherd, C. L. & Kulhanek, D. K. (2016). Eocene nannofossil biostratigraphy of the mid-Waipara River section, Canterbury Basin, New Zealand. Journal of Nannoplankton Research. 26(1): 33-59. gs

    Stradner, H. & Edwards, A. R. (1968). Electron microscopic studies on Upper Eocene coccoliths from the Oamaru Diatomite, New Zealand. Jahrbuch der Geologischen Bundesanstalt. 13(66): 1-48. gs

    Varol, O. (1998). Palaeogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 200-224. gs

    Wang, C. & Huang, W. (1989). Calcareous nannofossils. Geol. Pub. House, Beijing. 202-252. gs

    Wei, W. & Wise, S. W. (1990). Middle Eocene to Pleistocene calcareous nannofossils recovered by Ocean Drilling Program leg 113 in the Weddell Sea. Proceedings of the Ocean Drilling Program. Scientific Results. 113: 639-666. gs

    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


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    Reticulofenestra dictyoda compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-11-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1160 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Simun Ascic (Zagreb University, Croatia)
    Isn't here more similarity between R. dictyoda and R. hillae? R. hillae is smaller than R. umbilica.
    Gravatar
    Mike Styzen (Noble Energy, US)
    As I conceptualize it, R. hillae bears the same relationship to R. umbilicus as R. gelida does to R. pseudoumbilicus. I've always chalked them up as probable environmental variants of the same species. I keep doingit because I figure that someday it might mean something, and I don't want to have to go back and split them out later.
    Gravatar
    Paul Bown (Univeristy College London, UK)
    R. hillae was described as ranging from 14-20?m, so the same as R. umbilicus. There has been quite some discussion about whether R. hillae and R. umbilica are separate taxa, e.g. see Backman & Hermelin (1986).
    Gravatar
    AH Oman
    I agree MIke, same size, same age range, just smaller central area. Perch-Nielsen, (1985) made the same comment about separating out R. gelida from R. pseudoumbilica. True, it may be environmental, but with some possibly stratigraphically useful exceptions, R. gelida seems to dominate the larger Retics from at least N5 up to the Late Mio Retic. pseudo/gelida acme point in lower N17. Art Waterman
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