A morphological study of Chaetoceros tenuissimus meunier, a little-known planktonic diatom, with a discussion of the Section Simplicia, subgenus Hyalochaete

The morphology of Chaetoceros tenuissimus Meunier, a little-known species, has been studied for the first time with electron microscopy. C. tenuissimus has been placed as a synomyn of C. simplex Ostenfeld since approximately 1930, and has been misidentified or neglected in routine phytoplankton coun...

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Detalhes bibliográficos
Autores: Sar, EA, Sunesen, I, Hernández-Becerril, DU
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2002
País:México
Recursos:Universidad Nacional Autónoma de México
Repositório:Sistema de Información de la Facultad de Ciencias, UNAM
OAI Identifier:oai:repositorio.fciencias.unam.mx:11154/1799
Acesso em linha:http://hdl.handle.net/11154/1799
Access Level:Acceso aberto
Palavra-chave:Marine & Freshwater Biology
Descrição
Resumo:The morphology of Chaetoceros tenuissimus Meunier, a little-known species, has been studied for the first time with electron microscopy. C. tenuissimus has been placed as a synomyn of C. simplex Ostenfeld since approximately 1930, and has been misidentified or neglected in routine phytoplankton counts. The cells are very small and solitary, square to rectangular in girdle view. The setae are narrow and straight, arising from the two poles of the valve at an angle of 45degrees to its apical axis. The valve face possesses an annulus, delimited by a hyaline rim. Costae and small areolae radiate from the annulus. A single rimoportula occurs within the annulus. The rimoportula opens externally in a flatened tube and internally by a simple slit. The setae exhibit spirals of minute pores and an intricate pattern of spiral and perpendicular costae

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