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Polychaos at the Protist Information Server

Polychaos annulatum.  

Polychaos fasciculatum

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.



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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