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TAXONOMIC STUDY OF TWO NEW GENERA OF FUSIFORM GREEN FLAGELLATES, TABRIS GEN. NOV. AND HAMAKKO GEN. NOV. (VOLVOCALES, CHLOROPHYCEAE) 1
Author(s) -
Nakada Takashi,
Nozaki Hisayoshi
Publication year - 2009
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2009.00652.x
Subject(s) - pyrenoid , biology , botany , chloroplast , spicule , chlorophyceae , green algae , algae , chlorophyta , anatomy , gene , biochemistry , sponge spicule
On the basis of LM, we isolated strains of two species of fusiform green flagellates that could be assigned to former Chlorogonium ( Cg .) Ehrenb. One species, “ Cg .” heimii Bourr., lacked a pyrenoid in its vegetative cells and required organic compounds for growth. The other was similar to Cg . elongatum (P. A. Dang.) Francé and “ Cg .” acus Nayal, but with slightly smaller vegetative cells. Their molecular phylogeny was also studied based on combined 18S rRNA, RUBISCO LSU ( rbc L), and P700 chl a ‐apoprotein A2 ( psa B) gene sequences. Both species were separated from Chlorogonium emend., Gungnir Nakada and Rusalka Nakada, which were formerly assigned to Chlorogonium . They were accordingly assigned to new genera, Tabris Nakada gen. nov. and Hamakko ( Hk .) Nakada gen. nov. as T . heimii (Bourr.) Nakada comb. nov. and Hk . caudatus Nakada sp. nov., respectively. Tabris is differentiated from other genera of fusiform green flagellates by its vegetative cells, which only have two apical contractile vacuoles and lack a pyrenoid in the chloroplast. Hamakko , on the other hand, is distinguishable by the fact that its pyrenoids in vegetative cells are penetrated by flattened thylakoid lamellae.