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The aquatic snail genus    Dianella    (  Gastropoda  :   Hydrobiidae  ) has only two representatives in Greece:    Dianella   schlickumi    Schütt, 1962 and    Dianella   thiesseana    (Kobelt, 1878).    D.   schlickumi   , a narrow endemic species to Lake Amvrakia (in Aitoloakarnania, western-central Greece), is considered as Critically Endangered (Possibly Extinct, sensu IUCN 2017). Our study confirmed its presence in Lake Amvrakia, where it had not been detected for more than 30 years. We document the unknown anatomical characters based on the    D.   schlickumi    specimens. Moreover, the presence of    D.   thiesseana    in the nearby lakes Trichonis and Lysimachia was also confirmed, while morphometric analyses enabled the discrimination between the two species. Redundancy Analysis revealed conductivity, dissolved oxygen and pH as the main environmental variables related to the above species’ distribution, shaping their community structure. Both    Dianella    species require urgent conservation measures to be enforced, due to their habitat degradation from human activities, which are limiting and fragmenting their range. For that purpose, effective management plans have to be elaborated and implemented at the mentioned lakes, focusing on the reduction of human pressures and on the improvement of their habitats.

nature conservation

Rediscovery of the endemic gastropod    Dianella   schlickumi    (  Gastropoda  ,   Hydrobiidae  ) and its discrimination from    Dianella   thiesseana   : environmental correlates and implications for their conservation