Ref ID : 2031
Vassil G. Golemansky, S.O. Skarlato, and M.T. Todorov; A Light- and Electron-Microscopical (SEM and TEM) Study of Microchlamys sylvatica n. sp. (Rhizopoda: Arcellinida). Arch.Protistenk 134:161-167, 1987
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A new species - Microchlamys sylvatica n. sp. (Arcellinida, Microchlamydiae), inhabiting the upper horizon (Ao) of brown forest soils from Bulgaria is described. Observations by scanning and transmission electron microscopy show that the shell is circular, slightly depressed on the dorsal side, with structure similar to that of M. patella (Claparede & Lachmann). The diameter of the shell varies between 140 and 175 µm (average size approx. about 160 µm). Shallow pits, about 0.6 µm in diameter, are scattered throughout the dorsal surface. The dorsal surface of the test is covered by a filamentous coat. Pores perforating this coat are evident in some pits. A layer of middle electron dense material without discernible structure is located underneath the surface coat. The middle part of the test consists of a continuous system of electron-translucent cavities and this system directly communicates with the outer medium via the surface coat pores. The ventral side is also covered by the filamentous coat, but its underneath layer differs from the underneath layer of the dorsal side. The cytoplasm is surrounded by a plasma membrane with a thin glycocalyx-like structure on its surface and a dense layer of parallel fibrils underlying it. Numerous spherical granules with alveoli inside them appear in the cytoplasm, most probably representing cagenous granules. M. sylvatica n. sp. is the second species from the family Microchlamyiidae known so far and appears to be a strictly pedobiont species.