我国微型硅藻类的新记录属——拟脆杆藻属-Core.PDF

44 1: 89–942005 doi:10.1360/aps040118 Acta Phytotaxonomica Sinica * ( 361005) Fragilariopsis, a newly recorded nanodiatom genus for China LIANG Jun-Rong LI Yang CHEN Chang-Ping GAO Ya-Hui * (School of Life Sciences, Xiamen University, Xiamen 361005, China) Abstract A nanodiatom genus, Fragilariopsis Hustedt, is newly recorded in China. This genus is characterized by, (1) cells in ribbons united by the entire or the greater part of the valve surface, (2) raphe strongly eccentric, (3) approximately equal numbers of interstriae and fibule, (4) apical axis often heteropolar, and (5) striae with two rows of poroids, seldom one or more than two. A detailed description of the taxonomic characteristics of the genus is given. The two species distributed in East China Sea and Huanghai Sea of China, F. kerguelensis (O’Meara) Hustedt and F. rhombica (O’Meara) Hustedt, were observed under TEM and photographed. Key words East China Sea, Huanghai Sea, nanodiatom, Fragilariopsis. TEM Fragilariopsis Hustedt 1. ;2.,;3.;4.;5. , F. kerguelensis (O’Meara) HustedtF. rhombica (O’Meara) Hustedt ; ; ; (nanodiatom)20 µm, (Hallegraeff, 1981, 1984),,, ,(,, 1993; , 1993),Skeletonema GrevilleThalassiosira Cleve Chaetoceros EhrenbergMinidiscus Hasle , ,,Thalassiosira weissflogii (Grun.) Fryxell Hasle(, , 1992; , 1992)(, 1993; , 1994)( ,, 1995)(Gao et al., 2003)(, 1999a, b) 2004-10-09 , 2005-07-18 : ; (2005CB422305, 2001CB409701) (Supported by the National Natural Science Foundation of China, Grant Nos.