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Lobosea: Testacealobosia: Arcellinida: Difflugiidae

Difflugia pyriformis
Ehrenberg, 1838

Family: Pseudostome terminal, of variable shape.
Genus: Pseudostome lacks lobed collar; test round or oval in cross-section; pseudostome relatively large, with or lacking a collar (Illustrated Guide, 1985).

Species: 45-50 μm long for small varieties, 100-600 μm long for large varieties; 25-30 μm wide (test diam.), small; 70-350 μm wide, large; test flask-shaped, base round or polygonal, narrow tapered neck; chitinoid, large imbedded quartz grains; Symbiont, green alga (Kudo, 1966).
Google Image Search
Test L/W less than 1.5
Difflugia pyriformis
D. pyriformis ?
410 x 260 μm
L/W=1.6
P/W=0.25
Shimo-no-koike
Shiga highland
Nagano, 2005
Difflugia pyriformis
D. pyriformis ?
348 x 214 μm
L/W=1.6
P/W=0.31
Hasu-ike
Shiga highland
Nagano, 2005
Difflugia pyriformis
D. pyriformis ?
290 x 220 μm
L/W=1.3
P/W=0.32
Tanohara marsh
Shiga highland
Nagano, 2006
Difflugia pyriformis
D. pyriformis ?
310 x 206 μm
L/W=1.5
P/W=0.29
Shimo-no-koike
Shiga highland
Nagano, 2005
Difflugia
D. pyriformis ?
240 x 164 μm
L/W=1.5
P/W=0.30
Numa-no-hara m.
Madarao highland
Niigata, 2005
Difflugia
D. pyriformis ?
220 x 150 μm
L/W=1.5
P/W=0.27
Imori pond
Myoko highland
Niigata, 2004
Difflugia pyriformis
D. pyriformis ?
175 x 140 μm
L/W=1.3
P/W=0.34
Tanohara marsh
Shiga highland
Nagano, 2004
Difflugia
D. pyriformis ?
98 x 74 μm
L/W=1.3
P/W=0.24
Japan, 199?
Difflugia pyriformis
D. pyriformis
or D. oblonga ?
90 x 60 μm
L/W=1.5
P/W=0.41
Univ. A.V.M.
Obihiro
Hokkaido, 2005
Test L/W more than 1.5
Difflugia pyriformis
D. pyriformis
360 x 230 μm
L/W=1.6
Iyari marsh
Omachi
Nagano, 2008
Movies
Difflugia
D. pyriformis ?
280 x 166 μm
L/W=1.7
P/W=0.33
near Imori pond
Myoko highland
Niigata, 2004
Difflugia
D. pyriformis
206 x 119 μm
L/W=1.7
P/W=0.32
Japan, 199?
Difflugia pyriformis
D. pyriformis
145 x 80 μm
L/W=1.8
P/W=0.44
Kisuge konuma
Shimogo
Fukushima, 2005
Difflugia
D. pyriformis ?
or D. oblonga ?
164 x 80 μm
L/W=2.1
P/W=0.38
Hiroshima, 1998
Movies

D. pyriformis
or D. oblonga ?
μm
L/W=1.6
P/W=0.39
Japan, 199?
Intermediate types
Difflugia pyriformis
D. pyriformis
or D. oblonga ?
190 x 100 μm
L/W=1.9
P/W=0.30
Suiren-numa
Hakkoda mountain
Aomori, 2005
Difflugia
D. pyriformis
or D. oblonga ?
178 x 100 μm
L/W=1.8
P/W=0.33
Aizu Recreation p.
Aizuwakamatsu
Fukushima, 2005
Difflugia pyriformis
D. pyriformis
or D. oblonga ?
or D. lanceolata ?
170 x 90 μm
L/W=1.9
P/W=0.33
Ichinose-enchi
Norikura highland
Nagano, 2005
Difflugia
D. pyriformis
or D. oblonga ?
88 x 42 μm
L/W=2.1
P/W=0.38
Japan, 199?
xxxx
D. pyriformis ?
or Nebela sp. ?
205 x 110 μm
L/W=1.9
P/W=0.38
Gozaisho marsh
Hachimantai
Iwate, 2005
Similar species -->> D. oblonga;

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Difflugia pyriformis
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