A new Ancylus and a new genus of Hydrobiidae from the Ohrid Lake basin (Mollusca: Gastropoda) Author Glöer, Peter Schulstrasse 3, D- 25491 Hetlingen, Germany. E-mail: gloeer @ malaco. de Author Pešić, Vladimir Department of Biology, Faculty of Sciences, University of Montenegro, Cetinjski put b. b., 81000 Podgorica, Montenegro. E-mail: vladopesic @ gmail. com, https: // orcid. org / 0000 - 0002 - 9724 - 345 X text Ecologica Montenegrina 2023 2023-07-11 64 185 190 http://dx.doi.org/10.37828/em.2023.64.2 journal article 10.37828/em.2023.64.2 2336-9744 13246869 urn:lsid:zoobank.org:pub:C6640452-261E-4893-9A1C-D68A6F0D8A4D Ohridonaumia trajanovski n. sp. https://zoobank.org/ urn:lsid:zoobank.org:act: 17DBAFC3-D390-4B2E-B27E-B7E061E71451 Figs. 3 A-G Type series — Holotype ( ZMH 141505 ): Shell height 2.21 mm , shell width 1.92 mm ; NORTH MACEDONIA , Ohrid Lake area , the springs of the Black Drim near Monastery of St. Naum , 40°54'36.04"N , 20°44'51.14"E , 13.09.2019 leg. Pešić. Paratypes : 3 ex. ZMH 141506 , 2 ex. in coll. Glöer , same data as the holotype . Type locality — North Macedonia , the springs of the Black Drim near Monastery of St. Naum , 40°54'36.04"N , 20°44'51.14"E . Etymology — New species is named after Dr Sasho Trajanovski (Hydrobiological Institute, Ohrid ) in appreciation for his comprehensive research of Lake Ohrid and its biota. Description — The valvatoid conical shell has 3.5 slightly convex whorls which grow regularly in height and width. The suture is deep. The aperture is nearly circular with a slightly sinuated lower lip, the outer lip is straight from lateral view. The umbilicus is open. The shell is 1.74-2.21 mm high and 1.66-1.92 mm broad. The flat penis is elongated triangular, tapered at the distal end without any bulge. Differentiating features — As for the genus. Habitat — Spring. Distribution — North Macedonia ; only known from the type locality ( Fig. 1 ).