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Cavernosa kapitiana (Bacillariophyceae): biogeography and morphology of the different life cycle stages

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Author: Cremer, H. · Haan, M. de · Vijver, B. Van de
Type:article
Date:2011
Source:New Zealand journal of Botany, December, 4, 49, 443-459
Identifier: 445568
doi: doi:10.1080/0028825X.2011.580767
Keywords: Biogeography · Cavernosa kapitiana · Diatoms · Ecology · Life cycle · Morphology · New Zealand · Subantarctica · Taxonomy · Energy / Geological Survey Netherlands · Earth & Environment · PG - Petroleum Geosciences · EELS - Earth, Environmental and Life Sciences

Abstract

The monospecific diatom genus Cavernosa is known from only two locations: Kapiti Island off the west coast of New Zealand and Ile de la Possession, Crozet Archipelago, in the southern Indian Ocean. Cavernosa kapitiana Stidolph is a chain-forming diatom with cylindrical frustules having an elongated valve mantle. We provide a description of the different life-cycle stages (normal frustules, globular initial cells, bell-shaped initial cells, first daughter cells of initial cells) of C. kapitiana based on examination of new material from Ile de la Possession and material from the type locality on Kapiti Island. The most remarkable morphological features include the complex valve face structure composed of pores, granules and ridges, the subdivision of the valve interior into marginal caverns, the complex structure of the mantle and girdle, and the presence and morphology of rimoportulae. The study concludes with an emended species description of C. kapitiana