Kingdom: Animalia > Phylum: Mollusca > Class: Gastropoda > Order: Cycloneritimorpha > Family: Neritidae > Genus: Theodoxus > Species: Theodoxus transversalis

Theodoxus transversalis (C. Pfeiffer, 1828)

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Quick facts

Threat status Europe Endangered (IUCN)
EU conservation status by biogeographical region Continental - Unfavourable-Inadequate
Pannonian - Unfavourable-Inadequate
Protected by EU Habitats Directive and 1 other international agreement
Natura 2000 sites 51 are designated for this species
Reported as invasive by NOBANIS
Most preferred habitats
  • rivers and lakes
  • wetlands
Natura 2000 species code 4064


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Threat and conservation status

IUCN Red List status of threatened species

The IUCN Red List threat status assesses the risk of extinction.

IUCN Red List Category
Not Evaluated
Near Threatened
Regionally Extinct
Not Applicable
Extinct in the Wild
Data Deficient
Least Concern
Critically Endangered

EU conservation status

Conservation status assesses every six years and for each biogeographical region the condition of habitats and species compared to the favourable status as described in the Habitats Directive. The map shows the 2007-2012 assessments as reported by EU Member State. Assessments are further detailed in the summary document available behind the link below.

Natura 2000 sites

Protected in the following Natura 2000 sites

Sitecode Country Site name Action
BG0000503 Bulgaria Reka Lom Map
BG0000396 Bulgaria Persina Map
BG0000232 Bulgaria Batin Map
BG0000616 Bulgaria Mikre Map
HUHN20001 Hungary Felső-Tisza Map
BG0001036 Bulgaria Balgarski izvor Map
BG0000282 Bulgaria Dryanovska reka Map
BG0000611 Bulgaria Yazovir Gorni Dabnik Map
BG0001014 Bulgaria Karlukovo Map
ROSCI0044 Romania Corabia - Turnu Măgurele Map
HUON20008 Hungary Rába és Csörnöc-völgy Map
ROSCI0031 Romania Cheile Nerei - Beuşniţa Map
ROSCI0206 Romania Porţile de Fier Map
BG0000335 Bulgaria Karaboaz Map
BG0000509 Bulgaria Tsibritsa Map
BG0000199 Bulgaria Tsibar Map
BG0000613 Bulgaria Reka Iskar Map
HUAN20004 Hungary Hernád-völgy és Sajóládi-erdő Map
BG0000240 Bulgaria Studenets Map
BG0000500 Bulgaria Voynitsa Map
BG0000279 Bulgaria Stara reka Map
HUAN20003 Hungary Bódva-völgy és a Sas-patak-völgye Map
BG0000608 Bulgaria Lomovete Map
BG0000181 Bulgaria Reka Vit Map
BG0000280 Bulgaria Zlatarishka reka Map
BG0000275 Bulgaria Yazovir Stamboliyski Map
BG0000523 Bulgaria Shishentsi Map
BG0000518 Bulgaria Vartopski dol Map
BG0000213 Bulgaria Tarnovski visochini Map
HUDI20026 Hungary Ipoly völgye Map
BG0000182 Bulgaria Orsoya Map
BG0000615 Bulgaria Devetashko plato Map
BG0000517 Bulgaria Portitovtsi - Vladimirovo Map
ROSCI0065 Romania Delta Dunării Map
BG0000374 Bulgaria Bebresh Map
BG0000247 Bulgaria Nikopolsko plato Map
BG0001037 Bulgaria Pastrina Map
BG0000614 Bulgaria Reka Ogosta Map
BG0000339 Bulgaria Rabrovo Map
BG0000281 Bulgaria Reka Belitsa Map
BG0000239 Bulgaria Obnova - Karaman dol Map
BG0000610 Bulgaria Reka Yantra Map
HUFH20011 Hungary Rába Map
BG0000216 Bulgaria Emen Map
ROSCI0108 Romania Lunca Mureşului Inferior Map
BG0000609 Bulgaria Reka Rositsa Map
BG0000432 Bulgaria Golyama reka Map
BG0000522 Bulgaria Vidinski park Map
BG0000340 Bulgaria Tsar Petrovo Map
BG0000336 Bulgaria Zlatia Map
BG0000498 Bulgaria Vidbol Map

Protected sites

Please note the site map takes a while to display.

Common names and synonyms

The species has no common names
No synonyms available.

Other resources

Fauna Europaea search Fauna Europaea
GBIF Global Biodiversity Information Facility
Habitats Directive Art. 17-2006 summary
ITIS search Interagency Taxonomic Information System
NCBI search National Center for Biotechnology Information
Wikipedia Wikipedia

External data

Reportnet deliveries

Files delivered through Reportnet with relevance to this species.

5 items found, displaying all items.1
Released Coverage Envelope File
2014-01-19 Bulgaria BG-NR under Habitat Directive 2011-2012 BG_HD_NReport 2011-2012
2014-01-06 Hungary HU_Art_17_report_2013_second round_10_31 HU_species_report_art17
2013-12-26 Bulgaria BG_habitats_report_2007-2012 Species reports
2008-04-10 Germany German national report Theodoxus transversalis
2008-03-03 Hungary delivery_report_art_17_HU Theodoxus transversalis

Summary of derogations for species

EU member states are required to report derogations from protection efforts of species.

3 items found, displaying all items.1
Region From Until Justification Activity Impact
Bulgaria 2011-08-25 2013-03-01 The permit allows 100 individuals from each species to be caught. Capture No impact
Bulgaria 2011-08-19 2013-03-01 The permit allows 100 individuals from each species to be caught. Capture No impact
Bulgaria 2011-07-14 2013-03-01 The permit allows 100 individuals from each species to be caught. Capture No impact
European Environment Agency (EEA)
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