Classification: ntax_cenozoic -> Holococcoliths -> bridged -> Helladosphaera -> Helladosphaera vavilovii
Sister taxa: H. cornifera, H. pienaarii, H. vavilovii, H. sp.
Citation: Helladosphaera vavilovii (Borsetti & Cati 1976) Young & Kleijne, in Young et al., 2003Rank: SpeciesBasionym: Homozygosphaera vavilovii Borsetti & Cati 1976Taxonomic discussion: The species was transferred to Helladosphaera by Young et al. (2003) since they showed that it was dimorphic
Distinguishing features: BCs like Homozygosphaera arethusae but bridge triangular in profile, terminated by ridge parallel to long axis of coccolith; open wall structure.
CFCs are well differentiated, helladoliths
Farinacci & Howe catalog pages: H. vavilovii *
The morphological data given here can be used on the advanced search page. See also these notes
|Tags||LITHS: holococcolith, elliptical, hollow, CA: bar, |
CSPH: tubular, elongated, CFC, CROSS-POLARS: R-prominent,
|Metrics||Lith size: 1.2->1.8µm; Coccosphere size: 7->10µm; |
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" 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: Helladosphaera
Borsetti, A. M. & Cati, F. (1976). Il Nannoplancton calcareo vivente nel Tirreno Centro-meridionale. Parte II. Giornale di Geologia. 40(1): 209-240. gs V O
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, Special Issue. 1: 1-132. gs V O