First Record of Orobdella tsushimensis (Hirudinida: Arhynchobdellida: Gastrostomobdellidae) from the Korean Peninsula and Molecular Phylogenetic Relationships of the Specimens

A new quadrannulate species of Orobdella (Hirudinida, Arhynchobdellida, Orobdellidae) from western Honshu, Japan

A new quadrannulate species of Orobdella Oka, 1895, Orobdellanaraharaetmagarumsp. n., from the mountainous region of western Honshu, Japan is described. Orobdellanaraharaetmagarum is a small species with a body length of less than 5 cm. Phylogenetic analyses using nuclear 18S rRNA and histone H3, as well as mitochondrial cytochrome c oxidase subunit I, tRNA^Cys, tRNA^Met, 12S rRNA, tRNA^Val, 16S rRNA, tRNA^Leu and NADH dehydrogenase subunit 1 markers indicated that the present new species is the sister species of the quadrannulate Orobdellaesulcata Nakano, 2010. Furthermore, mitochondrial DNA genealogy within Orobdellanaraharaetmagarum demonstrated that this new species is divided into eastern and western lineages.

A new quadrannulate species of Orobdella (Hirudinida, Arhynchobdellida, Orobdellidae) from central Honshu, Japan

A new quadrannulate species of Orobdella, Orobdellamasaakikuroiwai sp. n., from the mountainous region of central Honshu, Japan is described. This is only the second small species known within this genus, with a body length of less than 4 cm for mature individuals. Phylogenetic analyses using nuclear 18S rDNA and histone H3 as well as mitochondrial COI, tRNA(Cys), tRNA(Met), 12S, tRNA(Val), 16S, and ND1 markers showed that Orobdellamasaakikuroiwai sp. n. is the sister species of the quadrannulate Orobdellawhitmani Oka, 1895. Phylogenetic relationships within Orobdellamasaakikuroiwai sp. n. conducted using mitochondrial markers reveled a distinction between eastern and western phylogroups.