''Potamon algeriense'' is a

freshwater crab Around 1,300 species of freshwater crabs are distributed throughout the tropics and subtropics, divided among eight family (biology), families. They show direct development and maternal care of a small number of offspring, in contrast to marine c ...

found in

North Africa North Africa (sometimes Northern Africa) is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region. However, it is sometimes defined as stretching from the Atlantic shores of t ...

Systematics

''Potamon algeriense'' is a close relative of the

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

an species ''

Potamon fluviatile ''Potamon fluviatile'' is a freshwater crab found in or near wooded streams, rivers and lakes in Southern Europe. It is an omnivore with broad ecological tolerances, and adults typically reach in size during their 10–12 year lifespan. They in ...

'', of which it was formerly considered a subspecies.

Biogeography

''Potamon algeriense'' has a wide but patchy distribution across

Tunisia Tunisia, officially the Republic of Tunisia, is a country in the Maghreb region of North Africa. It is bordered by Algeria to the west and southwest, Libya to the southeast, and the Mediterranean Sea to the north and east. Tunisia also shares m ...

(

Jendouba Jendouba ( ; Formerly known as Souk El Arba until 30 April 1966) is a city in northwestern Tunisia, and capital of the Jendouba Governorate. It is an important crossroads with many road links to other towns such as El Kef, Tabarka, Ain Draham ...

Béja Béja ( ') is a city in Tunisia. It is the capital of the Béja Governorate. It is located from Tunis, between the Medjerdah River and the Mediterranean, against the foothills of the Khroumire, the town of Béja is situated on the sides of D ...

Kairouan Kairouan (, ), also spelled El Qayrawān or Kairwan ( , ), is the capital of the Kairouan Governorate in Tunisia and a UNESCO World Heritage Site. The city was founded by the Umayyads around 670, in the period of Caliph Mu'awiya (reigned 661� ...

and

Gafsa Gafsa (; ; ') is the capital of Gafsa Governorate in Tunisia. With a population of 120,739, Gafsa is the ninth-largest Tunisian city and is 335 km from the country's capital, Tunis. Overview Gafsa is the capital of Gafsa Governorate, in ...

Governorates),

Algeria Algeria, officially the People's Democratic Republic of Algeria, is a country in the Maghreb region of North Africa. It is bordered to Algeria–Tunisia border, the northeast by Tunisia; to Algeria–Libya border, the east by Libya; to Alger ...

(

Algiers Algiers is the capital city of Algeria as well as the capital of the Algiers Province; it extends over many Communes of Algeria, communes without having its own separate governing body. With 2,988,145 residents in 2008Census 14 April 2008: Offi ...

Médéa Médéa () is the capital city of Médéa Province, Algeria. It is located roughly 68 km south of Algiers. The present-day city is situated on the site of an ancient Roman military post and has a history dating back to the 10th century. The ...

and

Béjaïa Béjaïa ( ; , , ), formerly known as Bougie and Bugia, is a Mediterranean seaport, port city and communes of Algeria, commune on the Gulf of Béjaïa in Algeria; it is the capital of Béjaïa Province. Geography Location Béjaïa owes its ...

Provinces) and

Morocco Morocco, officially the Kingdom of Morocco, is a country in the Maghreb region of North Africa. It has coastlines on the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to Algeria–Morocc ...

(

Kénitra Kenitra (, , , ) is a city in northwestern Morocco. It is a port on the Sebou River with a population of 507,736 as of 2024. It is one of the three main cities of the Rabat-Salé-Kénitra region and the capital of the similarly named Kénitra P ...

and

Fes Fez () or Fes (; ) is a city in northern inland Morocco and the capital of the Fez-Meknes administrative region. It is one of the largest cities in Morocco, with a population of 1.256 million, according to the 2024 census. Located to the nort ...

Provinces). ''Potamon algeriense'' is the only member of the freshwater crab family

Potamidae Potamidae is a family of freshwater crabs. It includes more than 650 species and nearly 100 genera, which are placed into two subfamilies: Potaminae and Potamiscinae. Subfamily Potaminae The Potaminae Ortmann, 1896 are distributed around the Me ...

in mainland

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

, which is otherwise dominated by the family

Potamonautidae Potamonautidae is a family of freshwater crabs endemic to Africa, including the islands of Madagascar, the Seychelles, Zanzibar, Mafia, Pemba, Bioko, São Tomé, Príncipe and Sherbro Island. Fossil remains dating from the Late Miocene The Lat ...

. It is presumed to have arrived from

Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...

during the

Messinian salinity crisis In the Messinian salinity crisis (also referred to as the Messinian event, and in its latest stage as the Lago Mare event) the Mediterranean Sea went into a cycle of partial or nearly complete desiccation (drying-up) throughout the latter part of ...

5–7 million years ago. ''Potamon algeriense'' is mostly located in North Africa and is slowly becoming extinct in the Morocco and Moulouya watershed areas due to a lack of biodiversity and conservation status . These organisms are having a difficult time surviving due to the overwhelming rate of pollution in these areas. Some still reside in the Moulouya watershed because of their high oxygenated water and low conductivity (Taybi, 2018).

References

* {{Taxonbar, from=Q5411003 Potamoidea Freshwater crustaceans of Africa Crustaceans described in 1967