Pyrgula
Encyclopedia
Pyrgula is a genus
of freshwater snail
with a gill
and an operculum
, an aquatic
gastropod mollusk in the family Hydrobiidae
.
Pyrgula is the type genus
of the subfamily Pyrgulinae. Pyrgula annulata is the type species
of the genus Pyrgula.
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of freshwater snail
Freshwater snail
A freshwater snail is one kind of freshwater mollusc, the other kind being freshwater clams and mussels, i.e. freshwater bivalves. Specifically a freshwater snail is a gastropod that lives in a watery non-marine habitat. The majority of freshwater gastropods have a shell, with very few exceptions....
with a gill
Gill
A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water, afterward excreting carbon dioxide. The gills of some species such as hermit crabs have adapted to allow respiration on land provided they are kept moist...
and an operculum
Operculum (gastropod)
The operculum, meaning little lid, is a corneous or calcareous anatomical structure which exists in many groups of sea snails and freshwater snails, and also in a few groups of land snails...
, an aquatic
Aquatic animal
An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life. It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin. Natural environments and the animals that...
gastropod mollusk in the family Hydrobiidae
Hydrobiidae
Hydrobiidae, common name mud snails, is a large cosmopolitan taxonomic family of very small freshwater snails and brackish water snails that have an operculum, aquatic gastropod mollusks in the clade Littorinimorpha.- Distribution :...
.
Pyrgula is the type genus
Type genus
In biological classification, a type genus is a representative genus, as with regard to a biological family. The term and concept is used much more often and much more formally in zoology than it is in botany, and the definition is dependent on the nomenclatural Code that applies:* In zoological...
of the subfamily Pyrgulinae. Pyrgula annulata is the type species
Type species
In biological nomenclature, a type species is both a concept and a practical system which is used in the classification and nomenclature of animals and plants. The value of a "type species" lies in the fact that it makes clear what is meant by a particular genus name. A type species is the species...
of the genus Pyrgula.
Species
Species within the genus Pyrgula include:- Pyrgula acicula A. & P. Reischutz, 2002
- Pyrgula annulataPyrgula annulataPyrgula annulata is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.Pyrgula annulata is the type species of the genus Pyrgula.- External links :*...
(Linnaeus, 1758) - type species- Pyrgula annulata annulata (Linnaeus, 1758)
- Pyrgula annulata dalmatica Schutt, 1968
- Pyrgula falkneri A. & P. Reischutz, 2002
- Pyrgula pambotis A. & P. Reischutz, 2002