Species of gastropod
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Melanopsis letourneuxi is a species of freshwater gastropod endemic to streams in coastal Morocco and Algeria.
Distribution, ecology and threats.
"Melanopsis letourneuxi" is found almost exclusively in relatively shallow medium-sized streams with stony substrates, rarely occurring in stagnant sources. The species had historically been reported from several localities in north Africa, including a site in Algeria or (disputedly) Morocco - "in the source and the river Moulouya, west of Maghnia" from which it has not been documented recently- and two confirmed adjacent Moroccan sites -Berguent and Ras el Ain at Aïn Beni Mathar - in which it is exceedingly rare. Remaining populations are threatened by water abstraction, pollution, and shell-collecting.
Populations.
Historically, several varieties (excluding the nominal var.) had been identified by Pallary and Bourguignat, including:
References.
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