Figure 5 in Nikolaj Livanow's historical collection sheds new light on potential local extinctions and host association in Hirudinea

Figure 5. Historical samples of Hirudo medicinalis Linnaeus, 1758 (lot EEZM 406-407 "Kazan. E. Meyer, 1891") and Glossiphonia grubei (Lukin & Epshtein, 1959) (lot EEZM 397 "Lake Baikal (Maloe More [Strait]). V. Garjaew, 1899"). (a) H. medicinalis (specimen No 1; dorsal view). (b) H. medicinalis (specimen No 2; ventral view). (c) G. grubei (dorsal view). Scale bar = 10 mm. Photo: A. V. Bespyatykh.