caa a22 4500 378931806 CHVBK 20180305123631.0 cr unu---uuuuu 161128e20040701xx s 000 0 eng 10.1515/BOT.2004.041 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2004.041 Morphological study of the marine planktonic diatom Chaetoceros castracanei Karsten (Bacillariophyceae) from Antarctic waters, with a discussion on its possible taxonomic relationships [Elektronische Daten] [Martha Ferrario, David U. Hernández-Becerril, Irene Garibotti] Phytoplankton samples were collected along the north coast of the Antarctic peninsula, the Weddell Sea and the Gerlache Strait, in different seasons in 1985, 1986, 1999, and 2000-2002. Chaetoceros castracanei Karsten, a fairly rare species was present in the samples; its morphology, taxonomy and distribution have not been recently investigated. This species occurred mainly from January to April, and was recorded with relatively high abundances in the Weddell Sea (up to 9.5=104 cells l-1). C. castracanei forms straight or slightly curved, short to long chains, with the terminal and intercalary setae pointing in the same direction. The apertures are very reduced, centrally constricted, and there are numerous chloroplasts in the cells including the setae. Electron microscopy studies showed that valves are randomly perforated by round poroids, costae on the valve are absent, and an excentric rimoportula is present in every valve of the chain; the setae are circular in cross section at the base, but become four-sided distally. Setae have perpendicular rows of elongate poroids, spines are arranged in spirals along the setae and the tips are very pointed. The intercalary setae are fused together in sibling valves. Chaetoceros impressus Jensen et Moestrup, recently described from Danish waters, appears to be conspecific with C. castracanei, and consequently we propose it as a synonym of the latter. The known distribution of Chaetoceros castracanei may be broadened to include Antarctic, subantarctic and Danish waters, and also possibly more temperate regions. © Walter de Gruyter Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Antarctica nationallicence Chaetoceros castracanei nationallicence diatoms nationallicence distribution nationallicence morphology nationallicence Ferrario Martha Departamento Científico de Ficología, Facultad de Ciencias naturales y Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina aut Hernández-Becerril David U. Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), Apdo. postal 70-305, México, D.F. 04510, Mexico aut Garibotti Irene IANIGLA, CRICYT, CC.330, 5500 Mendoza, Argentina aut Botanica Marina Walter de Gruyter 47/4(2004-07-01), 349-355 0006-8055 47:4<349 2004 47 botm https://doi.org/10.1515/BOT.2004.041 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2004.041 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ferrario Martha Departamento Científico de Ficología, Facultad de Ciencias naturales y Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina aut NATIONALLICENCE 700 1- Hernández-Becerril David U. Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), Apdo. postal 70-305, México, D.F. 04510, Mexico aut NATIONALLICENCE 700 1- Garibotti Irene IANIGLA, CRICYT, CC.330, 5500 Mendoza, Argentina aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 47/4(2004-07-01), 349-355 0006-8055 47:4<349 2004 47 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter