Ohridonaumia, Glöer & Pešić, 2023

Glöer, Peter & Pešić, Vladimir, 2023, A new Ancylus and a new genus of Hydrobiidae from the Ohrid Lake basin (Mollusca: Gastropoda), Ecologica Montenegrina 64, pp. 185-190 : 188

Genus Ohridonaumia n. gen.

https://zoobank.org/ urn:lsid:zoobank.org:act:4972A123-13BF-4EEF-ABA4-EB8018FFB0AF

Diagnosis — The valvatoid shell is conical with a nearly circular aperture. The lower lip is sinuated from umbilical view. The umbilicus is open. The flat penis is elongated triangular, tapered at the distal end without any bulge.

Type species — Ohridonaumia trajanovski n. sp.

Etymolgy — The name is a combination of the Lake Ohrid and the name of the Monastery of St. Naum in whose vicinity the new genus was discovered .

Differential diagnosis — The family Hydrobiidae in Ohrid Lake includes 27 endemic species, belonging to the nominal genera Dolapia , Gocea , Lyhnidia , Ohrigocea , Ohridohauffenia , Ohridohoratia , Polinskiola , Pseudohoratia , Strugia , and Zaumia ( Radoman, 1983) . The new species resemble Ohridohoratia Hadžišče, 1956 . The species of the latter genus differs in having elongated conical shells and the shape of the penis with a slight bulge on the left side. The new genus has valvatoid conical shell more than 2 mm in height, and a simple penis without any outgrowth or bulge. Ohridohauffenia Hadžišče, 1956 , differs in shape of shells (depressed valvatoid shell up to 1.5 mm in height) and the penis with a weak outgrowth on the left side.

Lyhnidia gjorgjevici Hadžišče, 1956 , a species described from a small lake near the monastery of St. Naum, resembles new species in having a long and slender, colourless penis without a lobe, but differs in its smaller dimensions and strongly curved outer lip. Zaumia sanctizaumi (Radoman, 1964) has a cylindrical penis and is smaller than Ohridonaumia n. gen.

The morphological and anatomical differences led us to the opinion that the new species is rather distinct from all other hydrobiid species from Lake Ohrid, therefore we created a new monotypic genus Ohridonaumia n. gen.