Diagnosis: Test ovoid, sometimes with a short collar; test circular in cross-section, usually composed of small and medium pieces of quartz; pseudostome circular. Cytoplasm with a number of relatively large dark truncated bi-pyramid crystals. Nucleus spherical, with granular nucleolar material.
Dimensions: My measurements: Length 83 - 98 µm; Width 58 - 65 µm; L/W ratio 1.4-1.6 (n=6); nucleus 28-31 µm (n=2)
Ecology: In sediment of the Miljacki Cave in Croatia (collected by Najla Baković, 2018).
Remarks: This species is characteristic by its dark large crystals resembling those in Cyphoderia species.
This species could be identical with D. lithophila.