Genus: Filament without branching; cell body cylindrical; one or several chloroplasts band-shaped, spirally arranged within the cell, pyrenoids present; septum with or without folded structure (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). About 300 species (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Vegetative cells 66-200 μm long, 40-50 μm diam.; 1 chloroplast making 3-5 turns in each cell; conjugation scalariform, tubes formed from both side; zygospores broad or short ellipsoidal, 50-83 μm long, 40-50 μm wide, internal layer yellowish, spre-surface smooth (Illustrations of The Japanese Fresh-water Algae, 1977).

S. porticalis 1 chl. 5-7 turns 90-163 x 40 μm Tochigi, 1997	S. porticalis 1 chl. 5 turns 112 x 40 μm Japan, 1998	S. porticalis 1 chl. 2-3.5 turns x 39 μm dividing cells Shizuoka, 2001	S. porticalis 1 chl. 4 turns x 35 μm Kawagoe Saitama, 2003
S. porticalis 1 chl. 3.5-4 turns 69 x 36 μm Japan, 1998	S. porticalis 1 chl. 2.5-3 turns 88 x 35 μm Japan, 1999	S. porticalis 1 chl. 5 turns x 40 μm Omoi river Oyama Tochigi, 2004	S. porticalis 1 chl. 3 turns x 45 μm Watarase river Ashikaga Tochigi, 2004
S. porticalis ? 1 chl. 6 turns 112 x 36 μm Japan, 1998	S. porticalis ? 1 chl. 4 turns x 35 μm Senjo-ga-hara Nikko Tochigi, 2003	S. porticalis 1 chl. 4-4.5 turns x 41 μm Karasu river Takasaki Gunma, 2004	S. porticalis 1 chl. 3.5 turns x 41 μm Karasu river Takasaki Gunma, 2004
S. porticalis ? 1 chl. 2 turns 45 x 36 μm near Karakemi m. Omachi Nagano, 2005	S. porticalis ? 1 chl. 2.5-3.5 turns 67-74 x 42 μm Satsunai river Obihiro Hokkaido, 2005	S. porticalis ? 1 chl. 3-6 turns 50-100 x 39 μm Isa-numa Kawagoe Saitama, 2006	S. porticalis ? 1 chl. 2.5 turns 45-50 x 40 μm near Ichino-kawa Higashi-Matsuyama Saitama, 2006

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