Homozygosphaera vercellii

Classification: Coccolithophores -> Holococcoliths -> flat-topped -> Coronosphaera HOL type -> Homozygosphaera vercellii
Sister taxa: C. multipora, C. mediterranea HOL gracillima type, C. mediterranea HOL hellenica type, C. mediterranea HOL wettsteinii type, H. vercellii, S. histrica HOL,


Citation: Homozygosphaera vercellii Borsetti & Cati, 1979
Rank: Species
Notes & discussion: Rarely reported. (NB Specimen illustrated in Winter & Siesser 1994, fig. 155 = C. wettsteinii).

Distinguishing features: Monomorphic, liths similar to BCs of C. wettsteinii, but pores more angular, separated by network of straight bars two crystallites wide, also boss smaller, often not central, some liths have two bosses. Weak basal flange.

Farinacci & Howe catalog pages: Homozygosphaera vercellii *

Search data:
TagsLITHS: holococcolith, H: cavate, H: disk-like, elliptical, hollow, RIM: H: tube (Holos), CA: H: distal-cover, H: distal-cover-flat, pores, process, PROCESS: hollow,
CSPH: ellipsoidal-----, spherical, equant, elongated, monomorphic, V-UNITS: ds-surface, V-prominent, R-UNITS: rim, R-prominent,
MetricsLith size: 1.6->2.4µm; Coccosphere size: 8->12µm; Liths per sphere: 80->150
Sources: lith size from illustrated specimens; csph size from illustrated specimens;
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 No known fossil record modern (0.00-0.00Ma, base in stage). Data source: [JRY rough estimate]

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Coronosphaera HOL type


    Borsetti, A. M. & Cati, F. (1979). Il Nannoplancton calcareo vivente nel Tirreno Centro-meridionale. Parte III. Giornale di Geologia. 43(1): 157-174. gs

    Gaarder, K. R. (1983). Validation of Homozygosphaera halldalii. INA Newsletter. 5(2): 50-. gs

    Heimdal, B. R. & Gaarder, K. R. (1980). Coccolithophorids from the northern part of the eastern central Atlantic I. Holococcolithophorids. “Meteor” Forschungsergebnisse. Reihe D, Biologie. 32: 1-14. 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, Special Issue. 1: 1-132. gs


    Homozygosphaera vercellii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-2-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=731 Go to Archive.is to create a permanent copy of this page - citation notes

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