Microworld

world of amoeboid organisms

Menu

Mayorella bigemma (Schaeffer, 1918)

Diagnosis: Locomotive form fairly broad triangular, with sometimes parallel dorsal folds; subpseudopodia usually present; nucleus spherical, with a central nucleolus; cytoplasmic crystals attached to spherical bodies or paired; floating form with long radiate pseudopodia.

Dimensions: Page: 100-300 µm; nucleus 12 µm. My measurements: 85-190 µm, nucleus 14.4-17.5 µm.

Ecology: Freshwater, in Sphagnum bogs.

Remarks: The name “bigemma” refers to the typical paired crystals, attached to spherical bodies. These crystals however are not characteristic for this species.

Mayorella
A-C: Locomotive form; D: Crystals; E: Nucleus. (F-H: Acanthamoeba spec.) (Drawings: Ferry Siemensma, 1987)
Recent posts

Penardochlamys arcelloides

P. arcelloides – after Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Haplomyxa spec

Fig. 1: Main cell body of specimen A, partly hidden by debris Haplomyxa sp. Three specimens were observed in a Petri dish, along with two

Read More »

Lachmannia spec.

“Lachmannia” spec., body length 127 µm “Lachmannia” spec. I found two cells, size about 125 µm when ovoid, with an organic-walled membranous test and a

Read More »

Diplophrys spec. 7

Diplophrys spec., with three tufts of filopodia Diplophrys spec. These cells are granular, never seen before. I found them in a sample from the Bert

Read More »

Psammonobiotus spec.

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

Read More »

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »