However, the genera " Neoguraleus " and " Liracraea " are operculate; the operculum in these genera has a terminal nucleus.
12.
The type and shape of the operculum is used to help identify and classify related groups ( genera ) of land operculates, and likewise some marine operculates.
13.
The type and shape of the operculum is used to help identify and classify related groups ( genera ) of land operculates, and likewise some marine operculates.
14.
Many of these operculate land snails live in habitats or microhabitats that are sometimes ( or often ) damp or wet, such as for example in moss.
15.
""'Emblanda emblematica " "'is a species of sea snail, a aquatic operculate gastropod mollusks in the clade Littorinimorpha.
16.
The form of the ascus is important for classification and is divided into four basic types : unitunicate-operculate, unitunicate-inoperculate, bitunicate, or prototunicate.
17.
""'Arganiella " "'is a species of very small freshwater snail with an aquatic operculate gastropod mollusks in the family Hydrobiidae.
18.
Although not true pulmonates, some operculate land snails, such as the Cyclophoridae have also lost their gills, and developed a vascularised lung from the mantle cavity.
19.
""'Neohoratia " "'is a genus of very small freshwater snails that have an aquatic operculate gastropod mollusks in the family Hydrobiidae.
20.
""'Beddomeia " "'is a genus of very small freshwater snails that have a gill and an aquatic operculate gastropod mollusks in the family Hydrobiidae.
