Humorisissa

Humorisissa is a genus of small, air-breathing land snails in the family Helicidae. The genus was first described in 1921 by the Austrian malacologist Ludwig von Teppich. Species within Humorisissa are characterized by their globose shells, typically measuring 10 to 15 mm in diameter, and a distinct spiral sculpture of fine growth lines. The aperture is rounded and the lip is often thickened. The animals themselves are terrestrial pulmonates, possessing a lung for respiration, and they are generally found in temperate forest ecosystems.

Distribution of Humorisissa is limited to central Europe, with confirmed records from the Carpathian foothills and the Styrian Alps. The snails prefer moist microhabitats beneath leaf litter and logs, and are most active during wet periods in spring and early autumn. Little is known about their feeding habits; however, as with many Helicidae, they are presumed to be detritivores, consuming decaying plant material and possibly fungi.

The genus is small, comprising only two formally recognized species: Humorisissa reus and Humorisissa minor. Both species are considered of least concern by the IUCN, as their populations are stable and they are not subject to significant anthropogenic threats. Conservation measures for the habitat, such as preserving native forest cover, are considered sufficient to maintain healthy populations. Further taxonomic study, particularly using molecular techniques, may clarify the relationship of Humorisissa to other genera within Helicidae.