world of amoeboid organisms

Menu
Raphidiophrys minuta
From Siemensma, 1991

Raphidiophrys minuta Nicholls, 1985

Diagnosis: Cells 10-15 µm in diameter (excluding scales). Scale layer 2-5 pm thick and noticeably clustered along beaded axopodia up to 50 µm long. Scales circular, to circular-ovate in outline, 2-6 µm in diameter. Scales are patterned with alternately long and short, wavy, radially dis­posed ribs; the long ones are 2 to 4 times longer than the short ones and extend from the scale margin to the centre of the scale. Scales lack a folded rim.

Ecology: Collected in the plankton of West Twin Lake, Ontario, Canada, 1979.

Remarks: Raphidiophrys minuta scales differ from those of other species with similar ornamentation by their lack of a marginal folded rim. Also the radial ribs originate from the scale centre, not from a median axis as in R. intermedia, R. elegans, and R. orbicularis.

I found this very small heliozoan in a sample from the Laegieskamp, the Netherlands (2016). It radiates some stiff axopodia each with 3-4 prominent extrusomes. It might be R. minuta.
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 »