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Radix natalensis 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Hygrophila Lymnaeidae

Scientific Name: Radix natalensis (Krauss, 1848)
Regional Assessments:
Synonym(s):
Lymnaea arabica (Brown & Wright, 1980)
Lymnaea caillaudi Bourguignat, 1883
Lymnaea gravieri Bourguignat, 1885
Lymnaea hovarum Tristram, 1863
Lymnaea mauritiana Morelet, 1875
Lymnaea natalensis Krauss, 1848
Lymnaea orophila Morelet, 1864
Lymnaea perrieri Bourguignat, 1881
Lymnaea raffrayi Bourguignat, 1883
Lymnaea vatonnei Bourguignat, 1868
Lymnaeus natalensis ssp. exsertus von Martens, 1866
Taxonomic Source(s): Bouchet, P., Marshall, B. and Rosenberg, G. 2016. MolluscaBase (2015). World Register of Marine Species . Available at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=737544. (Accessed: 25 April 2016).
Taxonomic Notes: The question if the species Lymnaea natalensis should be placed in the genus Lymnaea or in the genus Radix, formerly considered a subgenus of the first, remained unresolved for a long time (Bargues et al. 2001). Thus for example Brown (1994) and Appleton (1996) refer to  Lymnaea natalensis, but the molecular study of Correa et al. (2010) provides definite arguments for the use of Radix natalensis. This species appeared on the IUCN Red List as Lymnaea natalensis until 2016.

The identification of large Radix specimens from the Arabian Peninsula as Lymnaea (Radix) natalensis remains doubtful. It may be that this is a separate species, i.e. Lymnaea (Radix) arabica Smith, 1894 (E. Neubert pers. comm. 2012).

Lymnaea mauritiana Morelet, 1875 is in recent literature also considered as a synonym of Radix natalensis.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2017
Date Assessed: 2016-06-15
Assessor(s): Van Damme, D.
Reviewer(s): Seddon, M.B.
Contributor(s): Appleton, C., Ghamizi, M., Jørgensen, A., Kristensen, T.K. & Stensgaard, A.-S.
Facilitator/Compiler(s): Sayer, C.
Justification:
This species is widespread with no major threats identified. It appears to be rather tolerant to environmental changes affecting water quality, and is assessed as Least Concern.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Radix natalensis is widespread in tropical Africa, but it is rare in the northeastern coastal area. It is known throughout the Congo in Central Africa, widespread in West, East and Southern Africa (except for the ephemeral aquatic systems in Namibia and Botswana), and from the western Cape Province (South Africa). In North Africa, it is very common in the Nile and the Nile Delta but has only been reported from northwestern Africa (the Maghreb) from three localities in Algeria, although it was previously known from many prehistoric localities (8-10,000 years ago) in this country. Outside of mainland Africa, this species possibly is present in Yemen (Al-Safadi 1990), Oman (Smythe and Gallagher 1977, Brown and Wright 1980, Brown and Gallagher 1985) and Saudi Arabia (Neubert 1998), but molecular research needs to confirm the taxonomic status of these subpopulations.

It also occurs on Madagascar (formerly called L. hovarum Tristram, 1863) and the Indian Ocean islands of Anjouan, Mayotte, Comoros (Brown 1994), Mauritius (formerly identified as Lymnaea mauritiana) (Griffiths and Florens 2006) and on Réunion (Forcellini et al. 2011). It is introduced on Réunion, Mayotte and Comoros.
Countries occurrence:
Native:
Algeria; Angola (Angola); Benin; Botswana; Burkina Faso; Burundi; Cameroon; Central African Republic; Chad; Congo; Congo, The Democratic Republic of the; Côte d'Ivoire; Djibouti; Egypt; Equatorial Guinea (Equatorial Guinea (mainland)); Eritrea; Ethiopia; Gabon; Ghana; Guinea; Guinea-Bissau; Kenya; Liberia; Madagascar; Malawi; Mali; Mauritius; Mozambique; Namibia; Niger; Nigeria; Sierra Leone; Somalia; South Africa; South Sudan; Sudan; Swaziland; Tanzania, United Republic of; Togo; Uganda; Zambia; Zimbabwe
Introduced:
Comoros; Mayotte; Réunion
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:No precise information is available regarding the population size, but this species is widespread, common and often abundant to very abundant.
Current Population Trend:Stable
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:It is found in permanent standing and running waters of different sizes and depths.
Systems:Freshwater

Use and Trade [top]

Use and Trade: Being an intermediate host of economically important trematodes, it is used in in-vitro cultures in many countries, where it is not native.

Threats [top]

Major Threat(s): No significant major threats are considered to be affecting this species at a global level. In southern Africa, it may be being displaced by the invasive Pseudosuccinea columella.

Conservation Actions [top]

Conservation Actions: No specific conservation measures are in place for this common species. Conservation, considering that R. natalensis is the main intermediate host of Fasciola gigantica and F. hepatica in Africa, does not seem likely.

Amended [top]

Amended reason: Point locality records for this species were recently compiled by D. Van Damme. As a result of these records, there has been a slight extension to the previously published distribution range for this species. These point locality records are also now displayed on the distribution map.

Citation: Van Damme, D. 2017. Radix natalensis. (amended version published in 2016) The IUCN Red List of Threatened Species 2017: e.T165761A110769214. . Downloaded on 19 October 2017.
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