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Deuteramoeba mycophaga (Pussard et al., 1980) Page, 1988

Syn.: Trichamoeba mycophaga Chakraborty and Old, 1986

Diagnosis: amoebae palmate to elongate, predominantly polytactic but may be monotactic in continuous locomotion, appearing tubular or clavate with a villous-bulb uroid. Hyaline ectoplasmic cap on pseudopodia and at advancing margin of monotactic cells. Endoplasm highly granular with many elongated and bipyramidal crystals up to 2.5 µm long. Usually a single contractile vacuole, 3-15 µm in diameter, located in the posterior region of the cell. Amoebae uninucleate with spherical to oval nuclei, 12-20 µm in diameter. Nucleolar material organized in a single unfragmented structure, oval to elongate. Double-wall cysts rounded to oval, ecto- and endocyst walls separated by amorphous material several um in thickness.

Dimensions: 45-180 µm, mean 110 µm long and 25-94 µm wide. Cysts rounded to oval, 21-60 µm in diameter, nucleus 12-20 µm in diameter.

Ecology: Soil. Feeding on fungal spores and bacteria. Europe and Australia.

Remarks: Amoebae in locomotion often appear palmate to elongate in shape. A slender tubular shape typical of the so-called “limax” form also frequently occurs. A distinctive floating form has not been observed. The uroid appears to be ectoplasmic and is often connected to the main body of the limax trophozoite by a narrow isthmus.

 

References:

Pussard M., Alabouvette C., Lemaitre I. and Pons R. 1980. Une nouvelle amibe mycophage endogee Cashia mycophaga n. sp. (Hartmannellidae, Amoebida). Protistologica 16: 443-451.

Page F.C. 1988. A New Key to Freshwater and soil Gymnamoebae. FBA, Ambleside. 122p.

Chakraborty, S. and Old, K.M., 1986. Ultrastructure and description of a fungus-feeding amoeba, Trichamoeba mycophaga n. sp. (Amoebidae, Amoebea), from Australia. J. Protozoology 33, 564-9.

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