Quadrulella symmetrica curvata  Wailes, 1912

Diagnosis: Pseudostome polygonal, formed by 6—7 plates.

Dimensions: Length 80—100 µm, width 33—45 µm; aperture 11—16 µm.

Ecology: Not specified.

Geographical distribution: North America: USA; South America: Brazil (Kosakyan et al., 2025)