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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