Microworld

world of amoeboid organisms

Menu
Deuteramoeba spec.
D. mycophaga (Photomicrograph Yana Eglit)

Deuteramoeba mycophaga (Pussard et al., 1980) Page, 1988
Basionym: Cashia mycophaga Pussard et al., 1980
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 small elongate spindle-shaped and larger trunated 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, with central nucleolus, oval to elongate. This nucleolus can be homogenous, with or without lacunae, or composed of some more or less spherical fragments. 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 12-26 µm in diameter.

Ecology: Soil. Feeding on fungal spores and bacteria. Europe, Canada 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.

Deuteramoeba spec.
D. mycophaga about 170 µm in locomotion; nucleus 26 µm (Photomicrograph Yana Eglit)
Deuteramoeba spec.
D. mycophaga (Photomicrograph Yana Eglit)
Recent posts

Rhizaspis armata

R. armata, 68 µm long, excl. spines – Laegieskamp Rhizaspis armata (Lauterborn, 1901) Dumack et al., 2021 Basionym: Pamphagus armatum Lauterborn, 1890 Diagnosis: Theca membranous,

Read More »

Rhizaspis spinosa

The original description with original drawings, Penard, 1890. Rhizaspis spinosa (Penard, 1890) Dumack et al., 2021 Basionym: Trinema spinosum Penard, 1890 Diagnosis: Theca membranous, ovoid

Read More »

Difflugia “pseudoclaviformis”

Difflugia “pseudoclaviformis”, front and side view, 424 µm Difflugia “pseudoclaviformis” Diagnosis: Shell pyriform, compressed, with a more or less pronounced aboral protuberance; shell composed of

Read More »

Difflugia from Lolo Pass

Shells 461-448 µm, stacked image. I found this large en remarkable shells in sediment of a small mountain lake near Lolo Pass, Montana USA. It differs

Read More »

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found about ten specimens of an agglutinated foraminifer in a sample

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »