Ophiaster hydroideus (Lohmann) Lohmann 1913

Coccolith case and appendices (arrow=joint with swollen joints), (DIC and PC)

Synonym(s): Meringosphaera hydroidea Lohmann 1903

Life-form: Solitary

Size: Diameter c. 3,5-6,5 µm, ordinary coccoliths length 0.9-1,8 µm

Resting spore:


Distinctive features: Cell with posteriorly placed starlike appendage. Appendage with 5-11 cord-like arms. Spine-bearing coccoliths at flagellar basis

Similar species: Ophiaster formosus

Distribution: Worldwide(?)

Gaarder, K. R. 1967. Observations on the genus Ophiaster Gran (Coccolithineae). Sarsia. 29: 183-192.

Heimdal, B. R. 1993. Modern Coccolithophorids. In: (Tomas eds.) Marine Phytoplankton: a guide to naked flagellates and coccolithophorids. pp. 147-247.

Manton, I. & Oates, K. 1983. Nanoplankton from the Galapagos Islands: two genera of spectacular coccolithophorids (Ophiaster and Calciopappus ), with special emphasis on unmineralized periplast components. Philosophical Transactions of the Royal Society of London B. 300: 435-462.

  Copyright © 1996-2006, Mats Kuylenstierna & Bengt Karlson All rights reserved.
Last modified on 15 September, 2006

Swedish Meteorological and Hydrological Institute


Department of Marine Ecology, Göteborg University, Sweden