Parlibellus nunivakiana is similar to P. crucicula, but the central area is asymmetric and rectangular, while in P. cruciula the central area is small and apically elliptical. The areolae are larger (less dense), the axial area is linear and wider, and the proximal raphe ends are tear-drop in shape. Parlibellus nunivakiana can also be compared to the marine species Sieminskia wohlenbergi and S. zeta, but P. nunivakiana is distinguished by the asymmetric rectangular central area without structure and the curvature of the valve margins.
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