Taxonomic discussion: Unambiguous Reticulofenestra disappears in the Early Quaternary but there are small reticulofenestrids without bridges though the Quaternary and a couple of extant species, including R. sessilis (see Young 2005), these are conventionally referred to Reticulofenestra but may prove to have descended from Gephyrocapsa by loss of the bridge.
Distinguishing features: Parent taxon (Reticulofenestra): No bridge, no slits This taxon: Closed central area. Rather heavily calcified giving irregular form, strongly crenulate margin.
Ecology & BiogeographyOccurs almost exclusively in symbiotic(?) associations with a centric diatom of the genus Thalassiosira. Deep photic. According to Hallegraeff 1984 the diatom is Thalassiosira punctifera Fryxell, Simonsen & Hasle Cultures: Strains of this species are maintained in culture, for details see Roscoff Culture Collection.
Lith size: 2.5->4µm; Coccosphere size: 6->10µm; Liths per sphere: 10->30 Data source notes: RCC
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003) First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: [JRY rough estimate]
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Reticulofenestra
References:
Chen, M. -P. (1980). Modern and redeposited coccolithophores for the indication of sediment dispersal pattern around Taiwan offshore region. Acta Oceanographica Taiwanica. 11: 129-156. gs
Hallegraeff, G. M. (1984). Coccolithophorids (Calcareous Nanoplankton) from Australian waters. Botanica Marina. 27: 229-247. gs
Lohmann, H. (1912). Untersuchungen über das Pflanzen- und Tierleben der Hochsee, zugleich ein Bericht über die biologischen Arbeiten auf der Fahrt der "Deutschland" von Bremerhaven nach Buenos-Aires in der Zeit vom 7. Mai bis 7. September 1911. Veröffentlichungen des Instituts für Meereskunde an der Universität Berlin. 1: 1-92. gs
Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs
Reid, F. M. H. (1980). Coccolithophorids of the North Pacific Central Gyre with notes on their vertical and seasonal distribution. Micropaleontology. 26(2): 151-176. gs
Yang, T. -N., Wei, K. & Wu, J. -T. (2012). Marine coccolithophores around Taiwan. Biodiversity Research Center, Academica Sinica, Taipei. 1-96. gs
Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs
Reticulofenestra sessilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-3-2025
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