Theodoxus danubialis is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites. The species is considered as endangered in Germany, Austria and in the Czech Republic.
Etymology The Latin name Theodoxus danubialis means "God's gift to the Danube" or "The praise of God in the Danube".
Subspecies Theodoxus danubialis cantianus (Kennard & Woodward, 1924) † Theodoxus danubialis danubialis (C. Pfeiffer, 1828) Theodoxus danubialis stragulatus (C. Pfeiffer, 1828) Biolib
Description Shells of Theodoxus danubialis can reach a diameter of . These shells are quite flattened, with 3–3.5 whorls. The surface has a characteristic dark brown zigzag drawing on a light background. The width of the zigzag lines is variable. The mouth is round to slightly elliptical. The operculum is pale yellow. The edge is brown and slightly thickened. The body of the snail is bright with a wide base. The antennae are long and pointed.PETER GLÖER and VLADIMIR PEŠIĆ The morphological plasticity of Theodoxus fluviatilis (Linnaeus, 1758) (Mollusca: Gastropoda: Neritidae)
Distribution The distribution of this species is Mediterranean and Pontic. Lisický M. J. (1991). Mollusca Slovenska [The Slovak molluscs]. VEDA vydavateľstvo Slovenskej akadémie vied, Bratislava, 344 pp. It occurs in Austria, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic (in Moravia it is critically endangered),Red List of the molluscs (Mollusca) of the Czech Republic Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF. Germany (in Bavaria only and it is critically endangered),Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 108, Hungary, Italy, Romania, Slovakia, Slovenia, Ukraine, Serbia and Montenegro.Fauna europaeaWMSDB – Worldwide Mollusc Species Data Base
Habitat This species needs clean, oxygen-rich rivers. These snails live on hard benthic substrates, typically rocks or stony ground and feed mainly on diatoms.
Bibliography Peter Glöer: Die Tierwelt Deutschlands. Mollusca I Süßwassergastropoden Nord- und Mitteleuropas Bestimmungsschlüssel, Lebensweise, Verbreitung. 2. neubearb. Aufl., 327 S., ConchBooks, Hackenheim 2002 Rosina Fechter und Gerhard Falkner: Weichtiere. 287 S., Mosaik-Verlag, München 1990 (Steinbachs Naturführer 10) Jürgen H. Jungbluth und Dietrich von Knore: Trivialnamen der Land- und Süßwassermollusken Deutschlands (Gastropoda et Bivalvia). Mollusca, 26(1): 105-156, Dresden 2008
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