First record of the acute bladder snail Physella acuta (Draparnaud, 1805) in the wild waters of Lithuania

The acute bladder snail Physella acuta (Draparnaud, 1805) was observed for the first time in the wild waters of Lithuania at one site in the lower reaches of the Nevėžis River in 2015. The restricted distribution and low density suggest recent introduction. Although P. acuta in the first half of the 20th century was reported in ponds of the Kaunas Botanical Garden, they appear to have vanished as of 2012. Thus we conclude that recent invasion into the wild most probably has resulted from disposal of aquarium organisms.