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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Raphidocystis glabra

after Zlatogursky et al., 2018 Raphidocystis glabra Dürrschmidt, 1985 Diagnosis: Periplast 40-50 μm in diameter; spine-scales 4.6–15 μm; plate-scales 6-7 × 3-3.5 μm; tiny teeth

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Raphidocystidae

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Planhoogenraadia liboica

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Deharvengia papuensis

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