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The validity of this genus is not at all certain (Page 1983), but it would be part of the family Amoebidae. The genus was established for a small number of species, Metachaos gratumM. oxyuris, M. discoides and a marine species M. fluvum by Schaeffer (Shaeffer 1926). An algivorous Metachaos species has been reported in waters of the east antartic coast (Mayes et al, 1998).  Metachaos discoides is the type species, it is up to 450mm in length and much like Amoeba proteus except that the pseudopods are round or oval in cross section. M. discoides has crystalline inclusions.Metachaos


Metachaos at the Protist Information Server

Page, F.C. (1983) "Marine Gymnamoebae" Inst.Terr.Ecol. NERC .

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.

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