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Euglenophyceae: Euglenales
Mastigophora: Euglenida

Phacus longicauda
(Ehrenberg) Dujardin 1841

Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966). Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped; often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species: 120-170 μm long, 45-70 μm wide; usually slightly twisted; a long caudal prolongation; flagellum about 1/2 body length; stigma prominent; a discoidal paramylon (paramylum) body central; pellicle longitudinally striated (Kudo, 1966).
var. longicauda: cell body 85-170 μm long, 45-70 μm wide; locomotive flagellum shorter than the cell body; a single paramylon body ring shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Google Image Search
Tail long
Phacus longicauda
P. longicauda
body, 90 x 56 μm
tail, 60 μm
near Mihashi Park
Saitama, 2006
Phacus longicauda
P. longicauda
body, 84 x 58 μm
tail, 77 μm
Japan, 199?
Phacus longicauda
P. longicauda
body, 75 μm
tail, 65 μm
Sakitama-kofun p.
Gyoda
Saitama, 2004
Phacus longicauda
P. longicauda
body, 73 μm
tail, 71 μm
Uruguay, 1999
Phacus longicauda
P. longicauda
body, 70 μm
tail, 77 μm
near Town Hall
Shobu
Saitama, 2004
Phacus longicauda
P. longicauda
body, 155 μm
tail, 70 μm
Iyari marsh
Omachi
Nagano, 2007
Phacus longicauda
P. longicauda
body, 64 μm
tail, 71 μm
Uruguay, 1999
Phacus longicauda
P. longicauda
body, μm
tail, μm
Japan, 199?
Phacus longicauda
P. longicauda
body, 61 μm
tail, 48 μm
Takasaka
Saitama, 2002
Phacus longicauda
P. longicauda
body, μm
tail, μm
Iruma
Saitama, 2003
Phacus longicauda
P. longicauda
body, 48 μm
tail, 50 μm
water reservoir
near Yamaguchi Univ.
Yamaguchi, 2004
Phacus longicauda
P. longicauda
body, 50 μm
tail, 30 μm
Izumo Shrine
Izumo
Shimane, 2006
Phacus longicauda
P. longicauda
body, μm
tail, μm
Nogyo Fureai p.
Toride
Ibaraki, 2008
Tail short
Phacus
P. longicauda, x 400
body, 81 x 60 μm
tail, 61 μm
Japan, 199?
Phacus longicauda
P. longicauda, x 400
body, 80 x 50 μm
tail, 48 μm
Japan, 199?
Phacus
P. longicauda ?
body, 55 μm
Mihashi Park
Saitama, 2002
Cell body elongated
Phacus longicauda
P. longicauda
body, 84 x 59 μm
tail, 60 μm
Saitama, 1999

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Phacus longicauda
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