Genus Sexangularia Awerintzew, 1906
Diagnosis: Test organic, sometimes with attached mineral particles; cross-section polygonal, mostly hexagonal. Nucleus vesicular.
Sexangularia minutissima (Penard, 1904) Awerintzew, 1906
Alabasta longicollis, after Penard, 1890 Alabasta longicollis (Penard, 1890) Diagnosis: Test pyriform, very elongated (3 times as long as wide), transparent, very little compressed, embedded
Alabasta kivuense, after Gauthier-Lièvre and Thomas, 1961 Alabasta kivuense Gauthier-Lièvre and Thomas, 1961 Diagnosis: In frontal view, the test is finger-shaped with subparallel sides, the
Paulinella micropora, – from Lhee et al., 2017 Paulinella micropora Lhee, Yang, Kim, Andersen & Yoon, 2017 Diagnosis: Test elongate, with five columns of scales,
Quadrulella tubulata, after Gauthier-Lièvre, 1953 Quadrulella tubulata Gauthier-Lièvre, 1953 Diagnosis: Shell almost lageniform, compressed, with rounded fundus and more or less irregularly arranged, commonly small,
Quadrulella elongata, after Van Oye, 1952 Quadrulella elongata Van Oye, 1952 Diagnosis: Test elongated with long neck and square plates, without any pores. Pseudosome slightly
Quadrulella scutellata, after Wailes, 1912 Quadrulella scutellata Wailes, 1912 Diagnosis: Test moderately large, hyaline, pyriform, compressed; composed of small siliceous, rectangular plates arranged in irregular