Bullinularia maxima Bobrov & Mazei, 2020

Diagnosis. Shell brown, opaque, elliptical in ventral view; ventral surface covered by external particles (xenosomes). Aperture an eight‑shaped slit. Upper lip projecting as a large, concave outgrowth that covers the apertural funnel and is visible in ventral view.

Dimensions: Shell width 205–220 μm; shell length 160–170 μm; aperture width 100–120 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 fits well in size (shell width ca. 200 μm) and in its elliptical shell shape with the first description of Bullinularia indica, and is clearly different from the smaller form, which is already referred to here as B. indica following established tradition. Bobrov et al. (2020) suggest renaming this morphotype—despite the priority of the original name—to maintain stability in the field and to formalize the differences between the two forms of Bullinularia indica already noted by Eugène Penard in 1911.