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Ultrastructure of Calyptrosphaera radiata, sp. nov. (Prymnesiophyceae, Haptophyta)

Published online by Cambridge University Press:  03 November 2000

STUART SYM  and
MASANOBU KAWACHI
STUART SYM
Affiliation:
Department of Animal, Plant & Environmental Sciences, University of the Witwatersrand, Private Bag 3 WITS 2050, South Africa
MASANOBU KAWACHI
Affiliation:
National Institute of Environmental Sciences, 16-2 Onogawa Tsukuba, Ibaraki, 305–0053 Japan
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Abstract

A novel member of the Calyptrosphaeraceae surrounded by a hyaline sheath, with only one chloroplast and without an emergent haptonema, is tentatively described as a species of Calyptrosphaera Lohmann. It has an interrupted body to its single pyrenoid and a unique microtubular root complement with only one crystalline root (CR) nucleating on root 2 (R2). At preprophase it produces a CR1, lending support to the idea that these crystalline roots contribute to the mitotic spindle. It shares numerous ultrastructural traits with the heterococcolithophorid Cruciplacolithus neohelis but, although it is tempting to consider it a haploid phase of this organism, is distinct from it.

Keywords

Calyptrosphaera radiataCalyptrosphaeraceaecrystalline rootsflagellar apparatusholococcolithophoridnew speciesPrymnesiophycidaetaxonomyultrastructure
Type
Research Article
Information
European Journal of Phycology , Volume 35 , Issue 3 , August 2000 , pp. 283 - 293
Copyright
© 2000 British Phycological Society

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