P. irregularis 40 µm - Photomicrograph Eckhard Voelcker

 

 

Genus Paraquadrula Deflandre, 1932

 

Diagnosis: shell transparent, broad oval, slightly compressed, composed of secreted quadratic or rectangular calcite plates in rows, sheet-like cement; nucleus vesicular.

 

Paraquadrula irregularis, 31 µm - stacked image