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).

->> Description at WPRNO

Google Image Search

Tail long; body flat or twisted
P. gigas 3 samples 106-130 μm 1999-2008	P. longicauda 17 samples tail long 48-88 μm 199?-2008	P. torta var. torta = P. tortus 9 samples 1997-2008	P. torta var. tortuosa = P. helikoides 18 samples 1997-2008
P. smulkowskianus 36- x 16 μm Kashiwa Village p. Kashiwa Chiba, 2008
P. lismorensis 4 samples bending 54-95 μm Japan, 2001-2004	P. ranula 153-160 x μm 3 samples 1999-2008	Phacus sp. 51 μm Iyari marsh 4 Omachi Nagano, 2007	Phacus sp. 82 x 46 μm Lake Biwa Maibara Shiga, 2008
Tail short; body flat or with wavy margins
P. triqueter 21 samples tail curved dorsal ridge 44-86 μm 1999-2008	P. pleuronectes 18 samples tail curved ridge absent 39-77 μm 199?-2006	P. obolus 7 samples tail straight 38-55 μm 2002-2006	Phacus sp. many paramylons 51 μm Mihashi Park Saitama, 2002
P. landekiensis 6 samples 26-71 μm 199?-2006	P. circulatus 4 samples body circular 45-55 μm 2004-2007	P. curvicauda 9 samples tail short, curved 27-50 x μm 1998-2006	P. acuminatus or P. orbicularis ? 45 samples tail V-shaped 25-45 μm 1998-2008
P. caudatus 5 samples 21-32 μm 199?-2006	P. undulatus 2 samples 43 x 29 μm Iwajuku Gunma, 2001	P. skujae 5 samples 21-24 x μm 2003-2006	P. trapezoides 31 x 16 μm Noda Higashi-matsuyama Saitama, 2004
Phacus sp. 25 x 11 μm Nanbata castle p. Fujimi Saitama, 2005
Body twisted or spirally striated or coated with granules
P. warszewiczii 60 x 31 μm Uruguay, 1999	P. inflatus 3 samples 50 x 36 μm 2001-2004	P. hammeli ? 29 μm longitudinally bent Saitama, 2001	Phacus sp. spiral striae 45 x 40 μm tail 25 μm Kurihashi Saitama, 2001
P. trimarginatus μm Kodama Saitama, 2003	P. trimarginatus 65 x 12 μm Mizumoto Park Tokyo, 2006
P. raciborskii 4 samples 35-37 μm 2001-2004	P. pyrum 30 samples 20-48 μm 1998-2008	P. trypanon 8 samples 39-50 μm 2003-2008
P. suecicus = P. monilata 39 x 23 μm Higusa-numa Hikari Chiba, 2003	P. suecicus = P. monilata 32 x 20 μm Omine-numa Minakami Gunma, 2008	P. hispidulus ? = P. pomiformis 12 samples 22-38 x μm 1999-2008	Phacus sp. P. glabrus ? 2 samples 23 x 20 μm Uruguay, 1999
Phacus sp. 2 samples 20 x 19 μm Uruguay, 1999	P. aenigmaticus 11 samples 20-30 x 9-14 μm 2001-2008	Phacus sp. 30 x 12 μm Shiba river near Owada p. Saitama, 2005	Phacus sp. 28 x 14 μm Maruyama Park Ageo Saitama, 2006
Tail absent
P. brevicaudatus ? 58 x 50 μm Tane-ike Togakushi highland Nagano, 2005	P. brevicaudatus ? μm Kashibaru m.5 Karatsu Saga, 2008	P. stokesii 14 samples 15-19 μm 2001-2005	P. pusillus 5 samples 16-33 μm 2001-2005

Please click on species name for more images.

Copyright Protist Information Server