Abstract
The terrestrial predatory leech of the genus Orobdella Oka, 1895 is recorded for the first time from Moneron Island, which is located southwest of Sakhalin, Russia. Morphological characteristics of the Moneron Orobdella clarify its taxonomic identification as O. kawakatsuorum Richardson, 1975, which is indigenous to Hokkaido Island in the Japanese Archipelago. The occurrence data extends the northernmost range of the genus Orobdella and shows that the leech fauna is shared between Moneron Island and Hokkaido.
Highlights
Orobdella Oka, 1895 is a genus of terrestrial predatory leeches endemic to Far East Asia (Sawyer 1986)
The most northern population was recorded on Rishiri Island (Nakano 2012), approximately 100 km from Moneron Island (Fig. 1)
The present study provides an additional example of the faunal relationships between Moneron Island and Rishiri Island
Summary
Orobdella Oka, 1895 is a genus of terrestrial predatory leeches endemic to Far East Asia (Sawyer 1986). It currently comprises more than 20 species from the Russian Far East, the Korean Peninsula, the Japanese Archipelago, and Taiwan (Nakano 2017; Nakano and Prozorova 2019). Two of the three northern species, Orobdella kawakatsuorum Richardson, 1975 and Orobdella koikei Nakano, 2012, are indigenous mainly to Hokkaido of the Japanese Archipelago, and they show a close sister relationship (Nakano 2012). One unidentified species was recorded from the Russian Far East in sympatry with O. ghilarovi (Prozorova and Nakano 2020), but its phylogenetic position remains uncertain
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