Nebela cylindrica Bonnet, 1979

Diagnosis: Shell very small, colorless, with a subcircular cross section at all levels. Neck sometimes indistinct from the main body, with a slightly arched chitinoid lip. Barely detectable lateral indentations of the pseudostome. Some individuals have two small symmetrical swellings near the pseudostome.

Dimensions: Accoding to Bonnet (1979): Shell length 48—50 µm; width 17—22 µm.

Habitat: Forest soils of Nepal (aerated litter of xerophilous forest with Pinus excelsa, neosols under Hypnaceae and Hymenophyllum saxicoles in Quercus semecarpifolia forest).

Remarks: This aerophilic species, very small and rare, has a fairly variable morphology, intermediate between those of N. militaris and N. tubulata.

Kosakyan et al., 2025: “This species has rarely been found, possibly because its natural habitat (tropical forest litter) has not been thoroughly sampled. The general shape of the species does not meet the criteria of hyalospheniids (circular, ovoid, piriform, elongated-piriform, lageniform); however, BONNET (1980) described its morphology as an intermediate between Nebela (now Alabasta) militaris and Nebela (now Padaungiella) tubulata. It therefore remains unclear if this species indeed belongs to genus Nebela.”