The striped nerite, scientific name Theodoxus transversalis, is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Neritidae, the nerites.
Distribution The distribution of this species is Danubian.(in Slovak) Lisický M. J. (1991). Mollusca Slovenska [The Slovak molluscs]. VEDA vydavateľstvo Slovenskej akadémie vied, Bratislava, 344 pp.
Fehér et al. (2012)Fehér Z., Albrecht C., Major Á., Sereda S. & Kríszik V. (2012). "Extremely low genetic diversity in the endangered striped nerite, Theodoxus transversalis (Mollusca, Gastropoda, Neritidae) – a result of ancestral or recent effects?". North-Western Journal of Zoology 8(2): 300-307. PDF. revealed in their conservation genetics study, that intraspecific variability of two researched DNA markers (cytochrome c oxidase subunit I and ATP synthase subunit α) is very low. They hypothesized that the bottlenecked population colonized the whole range of Theodoxus transversalis in the Holocene. Fehér et al. (2012) also hypothesized that such low genetic diversity caused the high sensitivity of Theodoxus transversalis to water quality. Theodoxus transversalis was widespread in Danubian drainage, but the population of this species declined because of water pollution and this species is considered as endangered. It is also listed in the Annexes II and IV of the Habitats Directive.
It occurs in: Austria Bulgaria Croatia Germany - in Bavaria only and it is critically endangered (vom Aussterben bedroht) Slovakia 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. Hungary Moldova Romania Serbia Ukraine
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