TWO NEW MARINE SPECIES OF THE DIATOM GENUS COCCONEIS EHRENBERG: C. MELCHIOROIDES SP. NOV. AND C. DALLMANNII SP. NOV., FROM KING GEORGE ISLAND, ANTARCTICA

Adil Y. Al-Handal Department of Marine Ecology, University of Gothenburg, P.O. Box 461, SE 405 30, Göteborg, Sweden

Catherine Riaux-Gobin Laboratoire d'Océanographie Biologique, CNRS/UPMC Paris6, UMR7621, FR-66650, Banyuls-sur-Mer, France

Oscar E. Romero Instituto Andaluz de Ciencias de la Tierra (IACT-CSIC), Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva, ES-18002, Granada, Spain

Angela Wulff Department of Marine Ecology, University of Gothenburg, P.O. Box 461, SE 405 30, Göteborg, Sweden

Abstract

Two new marine diatom species, Cocconeis melchioroides and C. dallmannii are described from Potter Cove, King George Island, Antarctica. Detailed descriptions are given based on LM and SEM images for both species and compared with the only known morphologically related taxon, Cocconeis melchiori Frenguelli and Orlando. Both C. melchioroides and C. dallmannii belong to the Cocconeis group, in which the sternum valve has very short and marginal striae. They differ from each other in the number of striae, number of areolae, central raphe endings, crista marginalis and valvocopula. A comparison with the Cocconeis costata group is provided. Both species are common inhabitants of the marine surface sediment in the Potter Cove area.

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TWO NEW MARINE SPECIES OF THE DIATOM GENUS COCCONEIS EHRENBERG: C. MELCHIOROIDES SP. NOV. AND C. DALLMANNII SP. NOV., FROM KING GEORGE ISLAND, ANTARCTICA

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TWO NEW MARINE SPECIES OF THE DIATOM GENUS COCCONEIS EHRENBERG: C. MELCHIOROIDES SP. NOV. AND C. DALLMANNII SP. NOV., FROM KING GEORGE ISLAND, ANTARCTICA

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