Protistology 4 (3) 279-294 (2006)

Morphology, biometry and ecology of Arcella gibbosa Penard 1890 (Rhizopoda, Testacealobosea)

Andrei Tsyganov 1 and Yuri Mazei 2

1 Department of Hydrobiology, Moscow MV Lomonosov State University, Moscow, Russia
2 Department of Zoology and Ecology, Penza VG Belinsky State Pedagogical University, Penza, Russia


Morphology and ecology of the testate amoeba Arcella gibbosa Penard 1890 isolated from different microbiotops was investigated. A detailed morphometric description of Arcella gibbosa is presented. Size frequency distribution analysis indicates that A. gibbosa is a size-monomorphic species. Shell diameter and shell height are the most stable characters, whereas length of apertural collar is the most variable one. Moreover, collar length has no significant correlations with other shell measurements. The main characters determining the distinctions between populations are shell diameter and shell height. These features are stable within a separate population and various in different ones. Populations from one biotope are more similar than those from different ones. There is no discreteness in distribution of the characters between the populations, which demonstrates significant monomorphism and stability of this species. A. gibbosa is a highly eurybiontic species, which may dwell in both acidic and toxic conditions, in a great variety of microbiotopes.

Key words:  Arcella gibbosa, testate amoebae, morphology, morphometry, Rhizopoda, Testacea

Address for correspondence. Andrei Tsyganov. Department of Hydrobiology, Moscow M.V. Lomonosov State University, Moscow, 119899 Russia.

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