world of amoeboid organisms

Euglypha cabrolae
4 Eugypha rotunda var. minor: apertural scale (5) and detail of the test (6); 7 Euglypha hyalina: apertural scale (8) and detail of the test (9); 10 Euglypha capsiosa: apertural scales (11-12) and detail of the test (13) – after Coûteaux, 1978

Euglypha capsiosa Coûteaux, 1978

Diagnosis: Test ovoid, little or no laterally compressed. Amount of apertural scales usually 12 (11 to 16), scales drop-shaped with the rounded tip facing forward. Tip differs from the rest of the scale by a more or less accentuated thickening according to the spines on the inner side of which one distinguishes a median hook and two (exceptionally three) pairs of lateral hooks. All hooks are straightened outward and forward. At the distal end, one may observe a finger-shaped structure comparable to that of Euglypha rotunda var. minor. The largest width is located at 1/3 posterior of the length. The length/width ratio is between 1.32 and 2.17. Scales of the test: 10 to 14 rows visible in width, 8 in length, oval.

Dimensions: (n=9) Test length: 18.5-27.9 µm (mean 24.4 µm); width: 9.4-16.4 µm (mean 12.7 µm). Apertural scales: length 2.3-4.1 µm (mean 3.6 µm), width 1.8-3.2 µm (mean 2.8 µm). Scales: length: 3.8-4.9 µm (mean 4.4 µm), width: 1.8-2.9 µm (mean 2.3 µm).

Ecology: Soil, forest. Japan.

Remarks: This species differs from E. rotunda var. minor and E. capsiosa mainly in size and in the shape of its oral scales. The creation of Euglypha hyalina and Euglypha capsiosa seems justified by the characters revealed by scanning electronmicroscopy. The ones that distinguish them are:
1) for the test: size and the number of rows of scales in length and width;
2) for the oral scales: the length, the length/width ratio, the location of the widest width, the presence or absence of a finger-shaped structure at the distal end, the presence or absence of a thickening at the proximal end.
Those who are common to them are:
1) for the test: the length/width ratio, the uncompressed character;
2) for the apertural scales: the width, the presence of hooks;
3) for the scales of the test: size.

Literature: Coûteaux, M., 1978. Quelques Thécamoebiens du sol de Japon. Rev.Écol.Biol.Sol, 15:1:119-128.

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