world of amoeboid organisms

Menu

Genus Polychaos Schaeffer, 1926

Diagnosis: during active locomotion usually polypodial, palmate, with several tubular pseudopodia, more or less equal and with no one dominant, proceeding anteriorly and anterior-laterally from common posterior mass; posterior of cell often with a bundle of fused, remnant pseudopodia; pseudopodia sometimes flattened and broadening towards ends; monopodial in rapid locomotion with a bulbous uroid; no dorsal ridges; nucleus granular or with other arrangements of nucleolar material; crystals irregular or plate-like to bi-pyramidal, some as paired bodies or clusters.

Key to the species:

1Nucleus with a ring- or belt-shaped nucleolus

2

Nucleus granular

3

2Nucleolar material in few narrow peripheral lobes, sometimes in a single curved band, twisting inside the nucleus.P. fasciculatum
Nucleolar material forming a perforated sphere inside the nucleus.

P. annulatum

3Nucleus discoid, spheroid or ovoidP. dubium
Nucleus shallowly to deeply cup-shapedP. nitidubium
Polychaos annulatum
Polychaos fasciculatum
Recent posts

Alabasta longicollis

Alabasta longicollis, after Penard, 1890 Alabasta longicollis  (Penard, 1890) Diagnosis: Test pyriform, very elongated (3 times as long as wide), transparent, very little compressed, embedded

Read More »

Alabasta kivuense

Alabasta kivuense, after Gauthier-Lièvre and Thomas, 1961 Alabasta kivuense  Gauthier-Lièvre and Thomas, 1961 Diagnosis: In frontal view, the test is finger-shaped with subparallel sides, the

Read More »

Paulinella micropora

Paulinella micropora, – from Lhee et al., 2017 Paulinella micropora Lhee, Yang, Kim, Andersen & Yoon, 2017 Diagnosis: Test elongate, with five columns of scales,

Read More »

Quadrulella tubulata

Quadrulella tubulata, after Gauthier-Lièvre, 1953 Quadrulella tubulata  Gauthier-Lièvre, 1953 Diagnosis: Shell almost lageniform, compressed, with rounded fundus and more or less irregularly arranged, commonly small,

Read More »

Quadrulella elongata

Quadrulella elongata, after Van Oye, 1952 Quadrulella elongata  Van Oye, 1952 Diagnosis: Test elongated with long neck and square plates, without any pores. Pseudosome slightly

Read More »

Quadrulella scutellata

Quadrulella scutellata, after Wailes, 1912 Quadrulella scutellata  Wailes, 1912 Diagnosis: Test moderately large, hyaline, pyriform, compressed; composed of small siliceous, rectangular plates arranged in irregular

Read More »