Thalassiosira fryxelliae nov. spec. (Bacillariophyceae) from Argentinian coastal waters
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Inés Sunesen
Abstract
The new marine nanoplanktonic diatom, Thalassiosira fryxelliae, is described with light and scanning electron microscopy from material collected in Argentinian coastal waters. T. fryxelliae is a morphologically distinctive species with: 1) cells embedded in irregular gelatinous masses, 2) absence of central, sub-central and scattered strutted processes on the valve surface, 3) one marginal ring of strutted processes with external tubes, 4) one marginal labiate process included in the ring of the strutted processes, 5) areolation pattern variable linear, sublinear, eccentric or irregular. Externally, the marginal strutted processes have double tubes, at least in the distal part, cut distally and with the half-cylinder bent vertically with crenulated distal edges and the labiate process has a simple tube. Internally, the strutted processes are short with four operculate satellite pores and the labiate process is sessile and radially located. Thalassiosira fryxelliae is similar to T. angulata and T. nanolineata in morphology and distribution pattern of the marginal strutted processes and in the location of the labiate process and to T. leptopus and some specimens of T. guillardii and T. pseudonana in lacking one central strutted process.
Copyright © 2004 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Dinoflagellate cysts in recent marine sediments from Scapa Flow, Orkney, Scotland
- Dinoflagellate cysts in recent marine sediments from the east coast of Russia
- Variation in chemical defenses against herbivory in southwestern Atlantic Stypopodium zonale (Phaeophyta)
- Seasonal variations in fatty acid composition of Caulerpa taxifolia (M. Vahl.) C. Ag. in the northern Adriatic Sea (Malinska, Croatia)
- Chemical composition and biological activity of the brackish-water green alga Cladophora rivularis (L.) Hoek
- Ultrastructure of tetrasporogenesis in the red alga Rhodymenia californica var. attenuata (Rhodymeniaceae, Rhodymeniales, Rhodophyta)
- Organisation of the microtubular cytoskeleton in protoplasts from Palmaria palmata (Palmariales, Rhodophyta)
- Thalassiosira fryxelliae nov. spec. (Bacillariophyceae) from Argentinian coastal waters
- Short-term uptake of dissolved organic nitrogen by an axenic strain of Ulva pertusa (Chlorophyceae) using [15]N isotope measurements
- The occurrence of Boodleopsis vaucherioidea Calderón-Sáenz et Schnetter (Udoteaceae, Chlorophyta) in Brazil
- First record of Undaria pinnatifida (Harvey) Suringar (Laminariales, Phaeophyta) on the Pacific coast of Mexico
- World atlas of seagrasses
- The genus Dictyota (Dictyotales, Phaeophyta) in the Indian Ocean
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