Departmental Bulletin Paper A New Species of the Genus Cymodoce (Crustacea: Isopoda: Sphaeromatidae) from Tobishima, Yamagata Prefecture, in the Sea of Japan
山形県飛島から発見されたニホンコツブムシ属(甲殻類, 等脚目, コツブムシ科)の一新種

Nunomura, Noboru

48pp.9 - 16 , 2017-03-28 , 金沢大学環日本海域環境研究センター = Institute of Nature and Environmental Technology Kanazawa University
ISSN:1347-7889
NCID:AA11430153
Description
A new species of the genus Cymodoce gibberula (Crustacea: Isopoda: Sphaeromatidae) is described based on specimens collected from Tobishima, Yamagata Prefecture, in eastern Honshu, Japan. The present new species is most closely allied to Cymodoce japonica (Richardson, 1906) and Cymodoce acuta (Richardson, 1904). However, it differs from them in the following features: (I) having a hemispheric dome in the midline of the posterior margin of the pleotelson, (2) a roubster process on the posterior margin of the pleotelson, (3) shorter penes, (4) a longer stylus on the second male pleopod, (5) blunt tips on both ramis of the uropod, and (6) numerous bosses on the exopod of the fifth pleopod. In addition to these, this species differs from japonica in having more numerous protuberances on the pleotelson, and from acuta in having fewer protuberances. Of these, the most remarkable difference is having a hemispheric dome in the midline of the posterior margin of the pleotelson. In general however, more than a few species furnished with this feature have been reported, mainly in the Indian Ocean. Among them, the present new species is most closely allied to Cymodoce lire/la (Schotte & Kensley). On the other hand, it differs from lire/la in the following features: (I) the presence of a transverse small dome in the anterior area of the pleotelson, (2) the entire tip of medial process on the pleotelson, (3) a shorter stylus on the second male pleopod, (4) the shape of the posterior margin of the pleonal somites, (5) longer penes, (6) less numerous tlagellar segments on both antennae, and (7) a more acute tip on the frontal lamina.
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