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Description of AmphitremaTest: elliptical, compressed, attached a mixture of siliceous particles, diatom frustules or flagellate cysts, a patterned cement network can be seen sometimes by scanning electron microscopy. Pseudostomes: 2, at opposite ends, elliptical, with or without short collar. Only A. wrightianum and A. stenostoma have been studied in more detail. In these species the protoplast nearly fills test, many filopods from protoplast at pseudostomes, often branched, to 150 µm long. Nucleus: spherical, with few small nucleolar globules. Symbionts: zoochlorellae. Habitat: wet sphagnum, peat bogs; indicator species in palaeolimnology (Tolonen, 1985). Four species, type: Amphitrema wrightianum Archer, 1869.