image_list image_listE

Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum cuspidatum
Brébisson var. cuspidatum
= Staurodesmus cuspidatus (Brébisson ex Ralfs) Teiling 1967

Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)

Species [ var. cuspidatum ]: Cell body (19.6-25.8)-31 μm long, (15.4-22.4)-28 μm wide, L/W=1.3, isthmus 4.2-7 μm wide; semicells inverted triangle in shape, apical and lateral margins slightly convexed, with a single elongated spine at each corner extended inward; apical view triangular, each side concaved, corners rounded (Illustrations of The Japanese Fresh-water Algae, 1977)
Google Image Search
Staurastrum
S. cuspidatum
20 x 20 μm
spines 10 μm
Tanohara marsh
Shiga highland
Nagano, 2004
Staurastrum cuspidatum
S. cuspidatum
18 x 18 μm
spines 8 μm
Tanohara marsh
Shiga highland
Nagano, 2005
Staurastrum cuspidatum
S. cuspidatum
x 18 μm
spines 10 μm
Tanohara marsh 3
Shiga highland
Nagano, 2007
Staurastrum cuspidatum
S. cuspidatum
22 x 20 μm
spines 7 μm
Hikage marsh
Shiga highland
Nagano, 2006
Staurastrum cuspidatum
S. cuspidatum ?
22 x 20 μm
4 spines
Shimo-no-koike
Shiga highland
Nagano, 2007
Staurastrum cuspidatum
S. cuspidatum
25 x 21 μm
spines 9 μm
Tane-ike
Togakushi highland
Nagano, 2005
Staurastrum cuspidatum
S. cuspidatum
23 x 21 μm
spines 8 μm
Karakemi marsh
Omachi
Nagano, 2006
Similar species -- >>triangularis S. subavicula; Arthrodesmus triangularis;

Please click on species name for more images
Staurastrum
Copyright Protist Information Server