Theodoxus numidicus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Cycloneritimorpha Neritidae

Scientific Name: Theodoxus numidicus (Recluz, 1841)
Neritina djedida Pallary, 1920
Neritina gentilis Pallary, 1901
Neritina maroccana Paladilhe, 1875
Neritina smendovensis Pallary, 1901
Neritina tingitana Pallary, 1898

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv) ver 3.1
Year Published: 2010
Date Assessed: 2007-10-19
Assessor(s): Van Damme, D. & Ghamizi, M.
Reviewer(s): van Damme. D., Ghamizi, M., Soliman, G. & McIvor, A.
This species is restricted to some upper parts of rivers and springs in Morocco and Algeria. This species is known from Tlemcem in Algeria. In Algeria situation for freshwater is a big problem - pollution, invasive species. It has an area of occupancy of about 100 km², from fewer than 10 locations, and is already lost from some locations (i.e. places where Pallary found it, see list of synonyms) so there is evidence for a decline in AOO, EOO, area of habitat and number of locations.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This is a Maghrebian endemic restricted to Morocco and Algeria. It is becoming rare over its whole range. In Morocco it has been recorded in the last 20 years in seven areas. Its recent distribution in Algeria unknown, and is probably very localised.
Countries occurrence:
Algeria; Morocco
Additional data:
Estimated area of occupancy (AOO) - km2:<100
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:No information available.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:It is restricted to cold pure water of springs and brooks, free from sediment or any kind of pollution. Only lives in certain places in springs on the lower side of rocks.

Threats [top]

Major Threat(s): It is threatened by pollution and invasive species. All species of Theodoxus are in decline because of human alteration of habitat such as water pollution.

Conservation Actions [top]

Conservation Actions: No information available.

Citation: Van Damme, D. & Ghamizi, M. 2010. Theodoxus numidicus. The IUCN Red List of Threatened Species 2010: e.T21728A9314774. . Downloaded on 20 June 2018.
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