Twelve taxa of Synuraceae; seven species of 
Mallomonas, one species and one variety of 
Synura, one species and one unidentified species of 
Paraphysomonas, and one species of 
Spinifermonas were found about 200 meters off Yamada Harbor in the southern basin of Lake Biwa in January, 1980. Eleven taxa excluding 
Mallomonas fastigata were newly found in Lake Biwa.
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