Striped nerite

Striped nerite
Five shells of Theodoxus transversalis
Conservation status
Endangered  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Neritimorpha
Order:	Cycloneritida
Family:	Neritidae
Genus:	Theodoxus
Species:	T. transversalis
Binomial name
Theodoxus transversalis (C. Pfeiffer, 1828)[2]

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.[3]

Fehér et al. (2012)[4] 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.[4] They hypothesized that the bottlenecked population colonized the whole range of Theodoxus transversalis in the Holocene.[4] Fehér et al. (2012) also hypothesized that such low genetic diversity caused the high sensitivity of Theodoxus transversalis to water quality.[4] Theodoxus transversalis was widespread in Danubian drainage,[4] but the population of this species declined because of water pollution and this species is considered as endangered.[1] It is also listed in the Annexes II and IV of the Habitats Directive.[4]

It occurs in:

• Austria
• Bulgaria
• Croatia
• Germany - in Bavaria only and it is critically endangered (vom Aussterben bedroht)[5]
• Slovakia[6]
• Hungary
• Moldova
• Romania
• Serbia
• Ukraine

References

1. Solymos, P. & Feher, Z. (2011). "Theodoxus transversalis". The IUCN Red List of Threatened Species. 2011. IUCN: e.T21726A9314252. doi:10.2305/IUCN.UK.2011-2.RLTS.T21726A9314252.en. Retrieved 15 January 2018.
2. C. Pfeiffer (1828). Naturgeschichte deutscher Land- und Süsswasser-Mollusken. Dritte Abtheilung. pp. I-VI [= 1-6], 1-84, Taf. I-VIII [= 1-8]. Weimar. (Landes-Industrie-Comptoir).
3. (in Slovak) Lisický M. J. (1991). Mollusca Slovenska [The Slovak molluscs]. VEDA vydavateľstvo Slovenskej akadémie vied, Bratislava, 344 pp.
4. 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.
5. Peter Glöer; Claus Meier-Brook; Olaf Ostermann (1992). Süsswassermollusken: ein Bestimmungsschlüssel für die Bundesrepublik Deutschland. p. 134. ISBN 978-3-923376-02-5.
6. (in Czech) 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.