netzelia pseudolimnetica
N. pseudolimnetica, after Penard, 1902

Netzelia pseudolimnetica Ogden and Meisterfeld, 1989
Synonym Difflugia limnetica (Levander, 1900) Penard, 1902.
D. limnetica – Pejler, 1962, Oikos, 12, p. 225-248.

Diagnosis: Shell ovoid, often yellow or brown in color, robust; outline generally constant, constructed of smooth mineral grains. Organic cement seen between grains, ‘more or less brown and pitted’. Aperture usually with three indentations, often with a pronounced organic necklace embedded with small grains. Single large, spherical, vesicular nucleus 30-40 µm in diameter with a large central nucleolus with depressions in the nucleoli which are probably indicative of less dense granular areas. Several small contractile vacuoles; pseudopodia numerous.

Dimensions: Length: 100-120 µm, nucleus 30-40 µm.

Ecology: Freshwater

Remarks: The significant differences between this species and D. hydrostatica are in mean body size, given by Penard as 100-120 µm, the nucleus and single large nucleolus. The size of the nucleus and the structure of the nucleolus differentiate it from D. lobostoma. It appears to represent a colorless, ecological intermediate form between D. gramen and D. lobostoma.
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Ferry Siemensma, created July 4, 2022; last modified October 16, 2024
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