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Medicinal leeches in the genus    Hirudo    have been utilized for therapeutic procedures for thousands of years. To date, six known species of    Hirudo    are widely distributed in different regions of the Eurasian continent. In this study, a new medicinal leech species    Hirudo   tianjinensis    Liu,  sp. nov.  is described based upon specimens collected from Tianjin City, China. The new species can be distinguished from its congeners by a combination of characters: blackish green dorsum with five continuous yellow longitudinal stripes; six sensillae on dorsal annulus a2 of segments VIII–XXV; greyish green ventrum with irregular bilateral dark brown spots; dorsum and abdomen separated by a pair of pale yellow stripes; front half atrium wrapped by white prostate; apparent albumen gland; epididymis massive in relation to ejaculatory bulb. The phylogenetic tree based upon  COI  implies a sister relationship to    H.   nipponia    Whitman, 1886. A key to the known species is provided.

﻿A new species of medicinal leech in the genus Hirudo Linnaeus, 1758 ( Hirudiniformes , Hirudinidae ) from Tianjin City, China

A new species of medicinal leech in the genus Hirudo Linnaeus, 1758 ( Hirudiniformes , Hirudinidae ) from Tianjin City, China