We found it on deep-water amphipods, which were caught in front of the mouth of selleck chem inhibitor the Bolshoi Chivyrkuy River (Figure 1: transect 4) at a depth of 240m.3.1.17. Piscicola sp. 1 Local host: Cypriniformes: Cyprinidae: Rutilus lacustris (Linnaeus, 1758) (NHPR). Locality: Sorozhiya Bay.Recently reported in Baikal [16]. This is a small-sized leech (length up to 8mm) having special body coloration different from the widespread species Piscicola geometra. Within the Chivyrkuy Gulf, one specimen was found on a roach, which was caught in waters opposite to Cape Kanin (Figure 1: transect 1).3.1.18. Piscicola sp. 2 Local host: Perciformes: Percidae: Perca fluviatilis Linnaeus, 1758 (NHPR). Locality: Monakhovo Bay.First time referred to Baikal. A few specimens were recently found on a perch in transect 1 (Figure 1).

Body length is up to 20mm. This sample requires further study and description.3.1.19. Haemopis sanguisuga (Linnaeus, 1758) Locality: Kotovo Bay (NGR).Inhabits only Palaearctic waters, where it is widespread and can be attributed even to transpalaearctic group. Predator of small vertebrates and invertebrates. H. sanguisuga belongs to very voracious predators, which ingest their prey completely or tear it into big pieces. Our specimens from the south part of transect 1 (Figure 1) were up to 70mm.3.1.20. Erpobdella sp. 1 Locality: Kotovo Bay, Sorozhiya Bay, Okunevaya Bay, Cape Kurbulik, Zmejovaya Bay, and Krokhalinaya Bay.This taxon was recently listed for Lake Baikal by Kaygorodova [17]. Erpobdella sp. 1 is widespread in the eutrophic and mesotrophic zones of the Chivyrkuy Gulf (Figure 1: transects 1 and 2).

Depending on the environmental conditions this animal could be predator of small invertebrates, necrophage or detritophage. The large-sized leeches are about 50mm in length and 4-5mm in width.3.1.21. Erpobdella sp. 2 Locality: Monakhovo Bay, Sorozhiya Bay, Okunevaya Bay, Cape Kurbulik, and Zmejovaya Bay.These leeches were registered for the first time in Baikal by Kaygorodova [16]. They were found in the coastal zone of the Chivyrkuy Gulf from Monakhovo Bay to Zmejovaya Bay (Figure 1). Biology of this species is similar to that of other representatives of the genus. Predator of small invertebrates, necrophage or detritophage. Large-sized leeches are up to 40mm long and 3�C5mm wide.3.1.22. Erpobdella sp. 3 Locality: Zmejovaya Bay.

For the first time reported in Baikal. These leeches were found only in Zmejovaya Bay (Figure 1: transect 2). Predator of small invertebrates, necrophage or detritophage. Specimens differ from Erpobdella sp. 1 and Erpobdella sp. 2 by dark dorsal pigmentation.4. Discussion4.1. Species DiversityAt present, 22 species Dacomitinib and 2 subspecies from two orders, Rhynchobdellida (18 sp.) and Arhynchobdellida (4 sp.