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Polychaos timidum
Palmate, multipodal form 45-60 mm
in length by 35-50 mm in breadth. Monopodal
forms 80-100mm in length (Bovee
1972). Rates of motility vary with
form, palmate forms 60-80mm/min, monopodal
forms 100-130mm/min. The uroid contains
hyaline spike described as originating from former pseudopods rather
that being trailing filopods resulting from adhesions as is usual for
uroidal projections. The cytoplasm contains numerous
crystals. Contractile vacuoles form near the nucleus at about 1mm
in diameter, they then travel down toward the uroid growing to 5-6mm.
They then fuse with the cell membrane. No cysts. This amoeba
is negatively phototactic and occurs world wide in freshwater. It is
bactivorous.
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References:-
Bovee, E.C. (1972). "The lobose amebas IV.
A key to the order Granulopdida Bovee and Jahn 1966, and descriptions of
some new and little-known species in the order." Arch.Protistenk.
114, 371-403.
Page, F.C. (1983) "Marine Gymnamoebae"
Inst.Terr.Ecol. NERC .
Page, F.C. & Baldock, B.M. (1980). "Polychaos
fasciculatum (Pernard 1902) (Amoebida): a light- and
electron-microscopic study. Arch. Protistenk. 123,
221-235.
Mayes, D.F., Rogerson, A., Marchant, H.J. and
Laybourn-Parry, J. (1998). "Temporal abundance of naked bacterivore
amoeba in coastal East Antartica." Estuarine,Coastal &
Shelf Sci. 46: 565-572.
Shaeffer, A.A. (1926). "Taxonomy of the
amoebas." Pap.Dept.Mar.Biol.Carnegie Instn.Wash., 24:
1-116.
Smirnov, A.V.
& Goodkov, A.V. (1998). "Study of Polychaos annulatum Penard,
1902 comb. nov. (Gymnamoebia, Amoebidae) with taxonomical analysis of Polychaos
fasciculatum-like species." Eur.J.Protistol. 34,
1-9.
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