Bullinularia macroporum Bobrov & Mazei, 2020

Diagnosis. Shell yellow‑brownish, transparent, circular in ventral view; ventral surface smooth with rare siliceous particles; ventral side concave, forming an apertural cavity. In lateral view hemispherical. Aperture a straight slit in ventral view. Upper lip with one row of very large pores; the upper lip projects as an outgrowth that slightly covers the apertural funnel and is visible in lateral view, like a visor.

Dimensions: Shell width 110–120 μm; length 110–115 μm; aperture width 39–42 μm; diameter of pores on the dorsal lip 7–8 μm.

Ecology and distribution: Soil. Type locality: Yalong Bay Tropical Paradise Forest Park, located 25 km southeast of the city of Sanya, Hainan, China.

Remarks: This species is very close to the original description of Bullinularia minor, but is larger. Compared with species of similar size (e.g. Bullinularia gracilis), it differs by its almost circular shape rather than the elliptic shape of B. gracilis. Among all known species, it is unique in possessing very large pores on the upper lip.