Gyraulus, Charpentier, 1837

Vinarski, Maxim V., Glöer, Peter & Palatov, Dmitry M., 2013, Gyraulus elenae sp. n. — a new Planorbid snail from Eastern Turkey (Mollusca: Gastropoda: Planorbidae), Zootaxa 3664 (1), pp. 95-98 : 98

Key to the Gyraulus species of Turkey and adjacent countries of the Near East (see also Table 2 )

1. Shell diameter exceeds 5 mm with 3.5–4 whorls ......................................................................................................... 2

1’. Shell diameter <5mm................................................................................................................................................... 8

2. Last whorl keeled or angled.......................................................................................................................................... 3

2’. Last whorl not keeled or angled.................................................................................................................................... 7

3. Shell height 1.0 – 1.2 mm ............................................................................................................................................. 4

3’. Shell 1.4 – 1.8 mm ........................................................................................................................................................ 5

4. Last whorl prominent and keeled, prostate with 16–18 diverticles ....................................................... G. pamphylicus

4’. last whorl not prominent, periphery angled, prostate with 9–18 diverticles ............... G. euphraticus (Mousson, 1874)

5. Shell with a prominent keel .......................................................................................................................................... 6

5’. Shell canted, last whorl prominent ................................................................................... G. argaeicus (Sturany, 1904)

6. Shell with a prominent keel and spiral ribs, ratio of D:H = 4.2 ............................ G. egridirensis Glöer et Girod, 2013

6’. Shell keeled, surface smooth, ratio of D:H = 3.8 .................................................... G. taseviensis Glöer et Girod, 2013

7. Shell with transverse and spiral ridges, diameter 4–7 mm, height 1.2–1.8 mm ................ G. albus (O.F. Müller, 1774)

7’. Shell height 1.2 mm, diameter 5 mm, surface smooth ............................................. G. hebraicus (Bourguignat, 1852)

8. Shell height <4 mm...................................................................................................................................................... 9

8’. Shell height 4–5 mm ................................................................................................................................................... 10

9. Shell surface with strong, curved transverse ridges, last whorl prominent ..................................... G. crista (L., 1758)

9’. Shell surface smooth ............................................................................................................................... G. elenae sp.n.

10. Height of the last whorl 1 mm .................................................................................................................................... 11

10’ Height of the last whorl 1.2–1.5 mm .......................................................................................................................... 12

11. Ratio D:h = 4.5, prostate with 14–19 diverticles ................................................................. G. ehrenbergi (Beck, 1837)

11’. Ratio D:h = 4.0, prostate with about 18–22 diverticles ............................................................................ G. nedyalkovi

12. Last whorl prominent .............................................................................................. G. piscinarum (Bourguignat, 1852)

12’. Last whorl not prominent............................................................................................................................................ 13

13. Vas deferens with a narrowing in the middle of the proximal part .............................................. G. parvus (Say, 1817)

13’. Vas deferens regular thin ............................................................................................................. G. laevis (Alder, 1838)