Euglypha brachiata Leidy 1879
Diagnosis: Test elongate, slightly constricted near the center, in cross-section round; fundus somewhat acute; pseudostome terminal bordered by a double row of 6-7 dentate scales; neck ornamented with 2-7 long recurved spines, arising from scales situated among the 3 rows adjoining the aperture; spines sometimes ribbon-shaped; body scales circular or sub-circular; nucleus large, placed posteriorly; cytoplasm and filopodia normal.
Dimensions: Leidy (1879): 104-128 µm long, Wailes (1915): 92-120 µm long, 30-37 µm wide, aperture 12-15 µm wide, spines 60-65 µm; my measurements 138 µm long.
Ecology: submerged sphagnum, sediments.
Remarks: This species has been confused with E. acanthophora by Penard (1902) and others. However, I own an original slide, mounted by Penard, with the label Euglypha brachiata Leidy non Penard (see below):