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A. multilobata
A. multilobata – from Golemansky, 1964

Arcella multilobata  Golemansky, 1964

Diagnosis: Test more or less in the shape of a sphere cap with a rounded edge, in ventral view circular, rarely elliptical. Pseudostome lobed: 6-10 shallow, rounded lobes agree with more or less pointed teeth. In lateral view, the dorsal face represents a segment of a circle or a portion of a parabola without marginal undulation. The angle of connection with the oral face is rounded. Oral face invaginating regularly towards the pseudostome and provided with a very short oral tube. The intussusception is 1/3-1/2 the height of the test. Test wall yellowish, rarely dark with very fine areoles, but always visible.

Dimensions: Diameter 84-98 µm; height 28-31 µm; aperture 20-24 µm; H/D ratio 0.30-0.38; invagination 12-16 µm.

Ecology: Wet mosses with rocks. Guinea.

Remarks: Arcella lobostoma Deflandre, 1928 differs from A. multilobata by its substantially hemispherical shape (H/D: 0.65-0.68) and its irregularly quadrilobed pseudostome. The thecal dimensions of A. lobostoma are smaller than those of A. multilobata. According to Deflandre 1928 the diameter of this first species is 42-54 µm.

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