| Acmella | |
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| Shell of Acmella nana . | |
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| Genus: | Acmella |
Acmella is a genus of minute, land snails with an operculum, gastropod mollusks, or micromollusks, in the family Assimineidae.
It consists of the following species:
Arinia boreoborneensis is a species of small land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae. This species is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Arinia dentifera is a species of small land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae. This species is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Arinia simplex is a species of small land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae. It is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Arinia streptaxiformis is a species of small land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae. This species is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Diplommatina cacuminulus is a species of land snails with an operculum, terrestrial gastropod mollusks in the family Diplommatinidae.
Georissa is a genus of minute land snails, terrestrial gastropod mollusks in the family Hydrocenidae. Although the species are best known for living on the surface of limestone rocks, they are often also found in and on the vegetation and on non-calcareous rocks. One species, Georissa filiasaulae, is cavernicolous. It is only known from two caves in the Sepulut area of Sabah, Malaysian Borneo, where its above-ground sister species, Georissa saulae, inhabits the rocks outside of the cave, and is connected to the cave snail via narrow zones of hybridization at the cave entrances. Possibly, G. filiasaulae has evolved without ever having been fully separated from its ancestor, a process known as speciation-with-gene-flow.
Opisthostoma bihamulatum is a species of minute land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae. It is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Opisthostoma is a genus of minute land snails with opercula, terrestrial gastropod mollusks or micromollusks in the family Diplommatinidae.
Opisthostoma dormani is a species of minute land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae.
Opisthostoma fraternum is a species of minute land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae. It is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Opisthostoma inornatum is a species of minute land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae.
Opisthostoma perspectivum is a species of minute land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae. This species is endemic to Malaysia. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
Opisthostoma simplex is a species of minute land snail with an operculum, a terrestrial gastropod mollusk in the family Diplommatinidae.
Diplommatinidae is a family of small land snails with an operculum, terrestrial gastropod mollusks in the superfamily Cyclophoroidea. The Cochlostomatinae Kobelt, 1902, were previously considered a subfamily of the Diplommatinidae, but are now known to be a separate family.
Opisthostoma vermiculum is a species of minute land snail with an operculum, a terrestrial gastropod mollusk or micromollusk in the family Diplommatinidae. The shell possesses four different coiling axes; the most for any known living gastropod. This member of the Diplommatinidae family is endemic to Malaysia. Its natural habitat is tropical limestone outcrops.
Everettia is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Dyakiidae.
Acmella nana is a species of land snail discovered from Borneo, Malaysia, in 2015. It was described by Jaap J. Vermeulen of the JK Art and Science in Leiden, Thor-Seng Liew of the Institute for Tropical Biology and Conservation at the Universiti Malaysia Sabah, and Menno Schilthuizen of the Naturalis Biodiversity Center in Leiden. It was named nana due to its minute size. Measuring only 0.7 millimeters in size, it is the smallest known land snail as of 2015. It surpasses the earlier record attributed to Angustopila dominikae, which is 0.86 mm in size, described from China in September 2015.
Plectostoma is a genus of air-breathing land snails in the family Diplommatinidae.
Geotrochus is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Trochomorphidae.