16. Ampullaceana relicta (Polinski, 1929)

Note.

This species is endemic to the large ancient lakes of the Balkans (Albrecht et al. 2008; Welter-Schultes 2012; Glöer 2019). A. relicta is phylogenetically close to A. ampla and, most probably, represents a local derivative of the latter originating as a consequence of its ancient invasion into large lakes. As Aksenova et al. (2018a) have shown, this species is polytypic and includes two subspecies, which are separately discussed below.