Two marine species of Cocconeis Ehrenberg (Bacillariophyceae): C. pseudomarginata Gregory and C. caribensis sp. nov.
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Oscar E. Romero
Abstract
Using light and electron microscopy, the frustular morphology of two structurally related marine Cocconeis species, C. pseudomarginata Gregory and C. caribensis sp. nov., is described. Cocconeis pseudomarginata has very dissimilar valves: the sternum-valve bears an externally depressed sternum, a longitudinal thickening, external elongated and internal circular areola openings; the raphe-sternum valve is concave between the apical axis and the valve margin. The type material of C. pseudomarginata and C. vitrea has been studied for comparison.
Cocconeis caribensis sp. nov., an epiphyte on mangrove roots in the Caribbean Sea, is distinguished by strongly concave and convex valves, high stria density (28–34 in 10 μm in the sternum valve), the presence of hyaline submarginal areas between the sternum and the margin in the sternum valve, and the sigmoid sternum and raphe-sternum. The areola structure and the morphology of the valvocopula and the fimbriae of the sternum valve of C. caribensis sp. nov. are similar to those of C. pseudomarginata.
Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Contents
- Author Index
- Taxonomical Index
- Subject Index
- Species of the Genus Thalassiosira (Bacillariophyceae) from the Gulf of Tehuantepec, Mexico
- Fungi on Juncus roemerianus 12. Two New Species of Mycosphaerella and Paraphaeosphaeria (Ascomycotina)
- A Highly Methylated Agar from Red Seaweed, Gracilaria arcuata
- Effect of Nitrogen Loading on Enzyme Activity of Macroalgae in Estuaries in Waquoit Bay
- The Ultrastructure of Grateloupia filicina (Halymeniaceae, Rhodophyta) Pit Plugs
- Morphology and Taxonomy of Chaetoceros contortus Schütt 1895, with Preliminary Observations on Chaetoceros compressus Lauder 1864 (Subgenus Hyalochaete, Section Compressa)
- Ecology of Sargassum muticum (Phaeophyta) on the North Coast of Spain: IV. Sequence of Colonization on a Shore
- Pico- and Nanophytoplankton Assemblages in a Subantarctic Ecosystem: The Strait of Magellan
- Isolation and partial characterization of giraffine, a lectin from the Mexican endemic alga Codium giraffa Silva
- Two marine species of Cocconeis Ehrenberg (Bacillariophyceae): C. pseudomarginata Gregory and C. caribensis sp. nov.
- Studies on the Structure and Reproduction of Populations of Cystoseira indica (Fucales, Phaeophyta) from Pakistan
