parts of the animal are retracted. The shape of the operculum varies greatly from one family of gastropods to another. It is fairly often circular, or more...

birds Operculum (bryozoa), a lid on the orifice of some bryozoans Operculum (fish), a flap covering the gills of bony fish Operculum (gastropod), a sort...

outside world and an internal part of an animal. Examples include: An operculum (gastropod), a single lid that (in its most complete form) closes the aperture...

Polyplacophora. Sclerites are not homologous to a gastropod operculum. The sclerites of the scaly-foot gastropod are also not homologous to the sclerites found...

Gastropods (/ˈɡæstrəpɒdz/), commonly known as slugs and snails, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda...

Acmella is a genus of minute, land snails with an operculum, gastropod mollusks, or micromollusks, in the family Assimineidae. It consists of the following...

revolution of the shell Operculum: the "trapdoor" of the shell Parietal callus: a ridge on the inner lip of the aperture in certain gastropods Periostracum: a...

clausilium operculum (gastropod) epiphragm mantle (mollusc) and mantle cavity body wall propodium caudal mucous pit nidamental gland Parapodium#Gastropod parapodia...

in Wiktionary, the free dictionary. Torsion is a gastropod synapomorphy which occurs in all gastropods during larval development. Torsion is the rotation...

The sensory organs of gastropods (snails and slugs) include olfactory organs, eyes, statocysts and mechanoreceptors. Gastropods have no sense of hearing...

Cecina is a genus of sea snails which have a gill and an operculum, gastropod mollusks or micromollusks in the family Pomatiopsidae. They live in shallow...

Turbo is a genus of large sea snails with gills and an operculum, marine gastropod molluscs in the family Turbinidae, the turban snails. Turbo is the...

"fingernail" spice (Gr. onycha) to be the fragrant operculum of certain mollusks (marine gastropods), which had the appearance of a claw. The same object...

is a genus of large freshwater snails with an operculum, African and Asian apple snails, aquatic gastropod mollusks in the family Ampullariidae, the apple...

some prosobranch gastropods, the aperture of the shell can be closed, and even completely sealed, with a sort of door or operculum. The aperture of many...

Robertsiella is a genus of freshwater snails which have a gill and an operculum, gastropod mollusks or micromollusks in the family Pomatiopsidae. The distribution...

family of minute snails, also known as palmleaf snails, with an operculum, gastropod mollusks or micromollusks in the superfamily Rissoidae. Many of these...

texts) pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when...

Pila ampullacea, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails. Thailand...

Gammatricula is a genus of freshwater snails which have a gill and an operculum, gastropod mollusks or micromollusks in the family Pomatiopsidae. The distribution...

Freshwater snails are gastropod mollusks that live in fresh water. There are many different families. They are found throughout the world in various habitats...

Maackia is a genus of freshwater snails with an operculum, an aquatic gastropod mollusk in the family Amnicolidae. Maackia angarensis (Gerstfeldt, 1859)...

is a species of large freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Viviparidae, the river snails. This species...

Faunus ater is a species of brackish water snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae. Faunus ater is the only...

Peringia is a genus of very small snails with gills and an operculum, gastropod mollusks in the family Hydrobiidae. This genus has become a synonym for...

similarly shaped shells, which have a deep, narrow umbilicus at the apex. No operculum is seen. The smooth shell of Bulla spp. is ovate and expanded, with a...

bumblebee snail, is a species of freshwater snail with an operculum, an aquatic gastropod in the family Nassariidae, most of which are marine. The assassin...

limpets in the family Trimusculidae. Many, but not all, sea snails have an operculum. The shells of most species of sea snails are spirally coiled. Some, though...

Georissa laseroni is a species of minute cave snails that have an operculum, gastropod mollusks in the family Hydrocenidae.This species is endemic to Australia...

Neotricula is a genus freshwater snails which have a gill and an operculum, gastropod mollusks or micromollusks in the family Pomatiopsidae. The distribution...