Abstract
A small-type quadrannulate leech species, Orobdella montipumila sp. nov., from the Tsukuba Mountains in central Honshu island, Japan, is described. Phylogenetic analyses using nuclear 18S rRNA, 28S rRNA, histone H3, mitochondrial cytochrome c oxidase subunit I, tRNACys, tRNAMet, 12S rRNA, tRNAVal, 16S rRNA, tRNALeu and NADH dehydrogenase subunit 1 markers revealed that O. montipumila formed a monophyletic lineage with seven congeners that include the small-type quadrannulate O. masaakikuroiwai Nakano, 2014, which is endemic to montane regions of central Honshu. However, the present phylogenies showed that O. montipumila and O. masaakikuroiwai are not sister species, which confirms that reduction of body length has arisen independently in Orobdella leeches indigenous to central Honshu.
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