A new sexannulate species of Orobdella (Hirudinida, Arhynchobdellida, Orobdellidae) from Yakushima Island, Japan

By

Nakano, Takafumi

Type

Article

Date of Publication

2012

Original Publication

ZooKeys

Volume

181

Pages

79-93

Subjects

Hirudinea , Hirudinida , Japan , molecular phylogeny , new species , Orobdella , Orobdellidae

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.181.2932

 

Abstract

A new sexannulate species of the genus Orobdella Oka, 1895, Orobdella mononoke sp. n., is described on the basis of five specimens collected from Yakushima Island, Japan. Orobdella mononoke sp. n. differs from other sexannulate Orobdella species in its possessing the following combination of characters: dorsal surface bicolor in life, I–XIII, XXVII and caudal sucker grayish purple, XIV–XXVI amber, male gonopore at XI c11/c12, female gonopore at XIII b2, 8 + 1/2 between gonopores, tubular but bulbous at junction with crop gastroporal duct, epididymides in XV–XIX, and atrial cornua ovate. Phylogenetic analyses using nuclear 18S rDNA and histone H3, and mitochondrial COI, tRNACys, tRNAMet, 12S rDNA, tRNAVal and 16S rDNA markers show that O. mononoke sp. n. is closely related to Orobdella esulcata Nakano, 2010 from Kyushu, Japan, and two species, Orobdella dolichopharynx Nakano, 2011 and Orobdella shimadae Nakano, 2011, from the Ryukyu Archipelago, Japan.