Gyraulus acronicus (J.B. Férussac, 1807 )

Marković, Vanja, Gojšina, Vukašin, Novaković, Boris, Božanić, Milenka, Stojanović, Katarina, Karan-Žnidaršič, Tamara & Živić, Ivana, 2021, The freshwater molluscs of Serbia: Annotated checklist with remarks on distribution and protection status, Zootaxa 5003 (1), pp. 1-64 : 30-31

59. Gyraulus acronicus (J.B. Férussac, 1807)

Findings in Serbia.

Gyraulus gredleri : Hesse (1929).

Gyraulus (Gyraulus) acronicus : Karaman (2001); Novaković (2014, 2016, 2018 pers. comm.).

Common name. Thames ramshorn snail.

Morphology. Small-sized snail (up to 7 mm diameter). Shell is flattened, regularly striated with mat surface, sometimes slightly keeled. For more details see Welter-Schultes (2012: 61, figure on the top of the page).

Distribution and ecology. Holarctic species up to 2000 m.a.s.l., preferring clean slow-flowing and stagnant waters rich with vegetation ( Welter-Schultes 2012). In Serbia this snail has rare findings. It has been reported from the Danube (early 20 th century), from few small ponds along the Danube (late 20 th century), and from the Plazović River most recently.

Other remarks. The species can be confused with Gyraulus laevis ( Alder, 1838) , but lacks a shiny shell surface of the latter. Critically endangered in Germany and Switzerland, and considered as a glacial relict ( Welter-Schultes 2012; Glöer 2019). On the IUCN Red List of threatened species it has been assessed as DD (Falkner & von Proschwitz 2011).