Figure 4 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661

Figure 4 Copulatory organs (A–D), bursa copulatrix (E) and egg mass (F). A–B, E–F Gyraulus takhteevi sp. n.: A morph 1 B morph 2 C–D G. acronicus from Krestovka River: young (shell Fig. 1F), male stage of mature (shell Fig. 1G).