Genus: Test more or less firm, single-layered; attached particles (Illustrated Guide, 1985).
Species:
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Allelogromia, x 400, x 640, August 7-13, 1999, Vermont-Maine U.S.A., by Y. Tsukii
Allelogromia linearis (Penard, 1902): Cell body cylindrical, 220-330 μm long; 6 - 8 times longer than wide; test brown, with rounded base, surface with linear rows of fine scales; pseudostome round, terminal, ~20 μm; protoplast filles test (Illustrated Guide, 1985).