Chondrostoma beysehirense

Common name. Beyşehir nase.

Diagnosis. Distinguished from other species of Chondrostoma in Central Anatolia and eastern Mediterranean basin by: ● body considerably compressed / ○ keels covered by scales on back in front of dorsal and on belly between pectoral and pelvic / ○ posterior scale margin markedly undulated / ○ 60−71 total lateral-line scales / ○ (6–7) 7–7 pharyngeal teeth / ○ 8–9½ branched dorsal rays / ○ 8−11½, usually 9½, branched anal rays / ○ 33−40 gill rakers / ○ thick cornified sheath covering lower lip. Size up to 251 mm SL.

Distribution. Türkiye: Lake Beyşehir basin.

Habitat. Fast to moderately fast-flowing rivers and streams, often with dense submerged vegetation and gravel substrate.

Biology. Feeds on periphyton scraped from hard substrate.

Conservation status. VU; restricted to a few tributaries of the lake. Probably also inhabited lake, but currently absent due to invasion by non-native species.

Further reading. Bogutskaya 1997a (description); Güçlü et al. 2018 (morphology); Çiftçi et al. 2020 (phylogeny); Bayçelebi et al. 2020a (distribution).