I found this very tiny specimen in sediments of a ditch in Gaasterland, the Netherlands. It resembles R. coerulea Penard, 1904, but is on the small size, Ø 6.6 µm where R. coerulea is 8-18 µm. However, while R. coerulea has extrusomes which are hardly visible, this species has about 2-4 relatively large extrusomes along its axopdia. It contracts its axopodia quickly when disturbed.

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Difflugia ampla

Difflugia ampla, after Rampi, 1950 (l) and Gauthier-Lièvre et Thomas, 1958 (r) Difflugia ampla Rampi, 1950 Diagnosis: Test broadly pyriform, with a wide and rounded

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Difflugia parva

Difflugia parva, from Gauthier-Lièvre et Thomas, 1958 Difflugia parva  (Thomas, 1954) Ogden, 1983 = Difflugia oblonga var. parva Thomas, 1954 Diagnosis: Test pyriform, tapering evenly from

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