Spermatozoids of Dictyopteris divaricata and Dictyota dichotoma (Dictyotales, Phaeophyceae) from Japan
1995
Yotsukura, N. (Hokkaido Univ., Hakodate (Japan). Faculty of Fisheries)
Male gametophytes produced from the cultured tetraspores of Dictyopteris divaricata (Okam.) Okamura and Dictyota dichotoma (Huds.) Lamouroux were shown to discharge spermatozoids with two flagella (anterior flagellum: 20-30 micro-meter long; posterior flagellum: 7-10 micro-meter long). The anterior flagellum bears numerous mastigonemes and the posterior flagellum is string-like. Spermatozoids with two flagella are characteristic of Japanese species, unlike related species from other regions which have a single falgellum. The number of flagella is one of the basic taxonomic criteria in the Dictyotales. These results suggest a taxonomic review is required for the Dictyotales
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