LIGHT- AND ELECTRON-MICROSCOPIC STUDY OF PELOBIONT PELOMYXA SECUNDA
(GRUBER, 1884) COMB. NOV. (ARCHAMOEBAE, PELOBIONTIDA)
M.A. Berdieva,1 L.V. Chystjakova,1 O.A. Miteva,2 A.O. Frolov,2 A.V. Goodkov 3
1 St. Petersburg State University, 2 Zoological Institute RAS and 3 Institute of Cytology RAS, St. Petersburg;
e-mail: maria.berd4@yandex.ru, pelgood1@gmail.com
Morphology of a pelobiont Pelomyxa secunda (Gruber, 1884) comb. nov. was investigated at light- and
electron-microscopical levels. Locomotive forms are elongated or cigar-shaped. The size of active forms varies
from 200 to 300 .m. Larger individuals (up to 400 .m) are not able to directed movement. Organism can produce
short, usually finger-shaped hyaline pseudopodia at the frontal side or laterally. The cell coat is represented
by amorphous glycocalix, up to 300 nm in thickness. A thin periphery cytoplasmic zone is deprived of any
organelles, vacuoles, endocytobionts and other inclusions and separated from main cytoplasm by a layer of arranged
microfilaments. P. secunda is multinucleate organism; nuclei are of granular type. The nucleolar material
is represented by two forms of discrete structures differing in size and electron density. Two or three layers of
short microtubules organized in the parallel arrangement are associated with outer side of the nuclear envelop.
P. secunda possess two types of obligate prokaryotic endocytobionts lying in individual symbiontophoric vacuoles.
Undulipodia, kinetosomes and root microtubular derivatives are not observed in P. secunda cells as well
as any developed cytoplasmic microtubular cytoskeleton.
Key words:
Archamoebae, pelobionts, Pelomyxa, morphology, ultrastructure
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