Theodoxus transversalis
Encyclopedia
Theodoxus transversalis is a small species
of freshwater snail
with an operculum
. It is an aquatic
gastropod mollusk in the family Neritidae, the nerites.
.
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...
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 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...
. It is 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 Neritidae, the nerites.
Distribution
Distribution of this species is DanubianDanube
The Danube is a river in the Central Europe and the Europe's second longest river after the Volga. It is classified as an international waterway....
.
- Austria
- Bulgaria
- Croatia
- Germany - in BavariaBavariaBavaria, formally the Free State of Bavaria is a state of Germany, located in the southeast of Germany. With an area of , it is the largest state by area, forming almost 20% of the total land area of Germany...
only and it is critically endangered (vom Aussterben bedroht) - Slovakia - extinct
- Hungary
- Moldova
- Romania
- Serbia and Montenegro
- Ukraine