Viviparidae, sometimes known as the river snails or mystery snails, are a family of large aquatic gastropod mollusks, being some of the most widely distributed operculate freshwater snails.
Sinocyclocheilus is a genus of freshwater fish in the family Cyprinidae that is endemic to Guangxi, Guizhou and Yunnan in China. Almost all of its species live in or around caves and most of these have adaptions typical of cavefish such as a lack of scales, lack of pigmentation and reduced eyes. Several species have an unusual hunchbacked appearance and some of the cave-dwellers have a "horn" on the back, the function of which is unclear. In contrast, the Sinocyclocheilus species that live aboveground, as well as a few found underground, show no clear cavefish adaptions. They are relatively small fish reaching up to 23 cm (9.1 in) in length. The individual species have small ranges and populations, leading to the status of most of the evaluated species as threatened. Many species populations in the genus have yet to be evaluated by the IUCN.
The Chinese mystery snail, black snail, or trapdoor snail, is a large freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae. The Japanese variety of this species is black and usually a dark green, moss-like alga covers the shell.
Cipangopaludina is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Viviparidae.
Tricula is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Pomatiopsidae.
Bellamya is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Viviparidae.
Margarya monodi is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.
Margarya is a genus of large operculate freshwater snails, aquatic gastropod molluscs in the family Viviparidae.
Margarya mansuyi is a species of large operculate freshwater snail, an aquatic gastropod mollusk in the family Viviparidae, the river snails.
Margarya bicostata is a species of large operculate freshwater snail, an aquatic gastropod mollusk in the family Viviparidae, the river snails.
Margarya melanioides is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.
Tchangmargarya is a genus of large operculate freshwater snails, aquatic gastropod molluscs in the family Viviparidae.
Anularya is a genus of large operculate freshwater snails, aquatic gastropod molluscs in the family Viviparidae.
Tchangmargarya multilabiata is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.
Margarya francheti is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.
Margarya oxytropoides is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.
Sinotaia quadrata is a species of a freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Viviparidae. It is widely distributed and common species in China and in northern Vietnam inhabiting various shallow freshwater habitats, where it can reach high densities. It is a keystone species in its habitat and can significantly affect water quality and phytoplankton communities. It is commonly used in Chinese cuisine.
Cipangopaludina cathayensis is a species of large, freshwater snail with an operculum and a gill, an aquatic gastropod mollusk in the family Viviparidae, the river snails.
Cipangopaludina lecythoides is a species of a freshwater snail with an operculum and a gill, an aquatic gastropod mollusk in the family Viviparidae, the river snails.
