Munna japonica Shimomura and Mawatari, 2001

Min, Ji-Hun Song and Gi-Sik, 2017, New record of limnoriid and asellote species (Crustacea: Malacostraca: Isopoda) from South Korea, Journal of Species Research 6 (3), pp. 237-240 : 239-240

2. Munna japonica Shimomura and Mawatari, 2001

ḂỄṞOiĄṘṚġ (ljḏ) ( Fig. 2 )

Munna japonica Shimomura and Mawatari, 2001: 52 , figs. 3, 4.

Material examined. South Korea: 2 males, Oasis ( SCUBA diving point), Namae­ri , Hyeonnam­myeon , Yangyang­gun, Gangwon­do (37°56 ʹ 28.04 ʺ N, 128°47 ʹ 23.95 ʺ E); depth 4 m; SCUBA diving and rinsing Gelidium elegans (seaweeds); collected by T. Park and Y. Eun on June 10, 2013 .

Diagnosis. Male. Body ( Fig. 2A, E ), length approximately 2.2 mm, 1.8 times as long as width. Eyestalk stout and short. Coxae of pereionites 2­6 visible dorsally. Maxilliped ( Fig. 2B ), palp comprises five segments; with oval­shaped epipod. Pereiopod 1 ( Fig. 2C ), basis with one superodistal seta; ischium with one seta on inferodistal and superior margins, respectively; merus trapezoidal­shaped; carpus widest, with two serrate spines and three long setae on inferior margin; propodus oval­shaped, with one serrate spine and two setae on inferior margin. Pleopod 1 ( Fig. 2D ) with a pair of distolaterally directed long projections and two anteroventral robust setae.

Remarks. Munna japonica was first described by Shimomura and Mawatari (2001) based on the specimens collected from Hiroshima, Japan. This species was previously reported from type locality only ( Shimomura and Mawatari, 2001). Munna japonica is distinguished from other species of Munna by several characters: (1) some short fine simple setae on frontal margin of head; (2) no robust sensory setae on lateral margin of pleotelson; and (3) pleopod 1 of male with a distolaterally directed long and stout projections. In general, specimens of M. japonica from South Korea agreed well with the original description of Shimomura and Mawatari (2001).

Habitat. Habitat information is not available for the type locality. However, the additional specimens were collect­ ed from various seaweed communities (e.g., Eckloniopsis radicosa , Gelidium amansii ) ( Shimomura and Mawatari, 2001). Korean specimens of M. japonica were collected from the bottom with seaweed ( Gelidium elegans ) at a depth of 4 m.

World distribution. Japan ( Shimomura and Mawatari, 2001), South Korea (this study).

Deposition. NIBR No. NIBRIV0000470357 and NIBR IV0000470358 (2 males) .

Molecular characters. GenBank accession numbers: KX186724 and KX186725 (2 males).

Figures

Fig. 2. Munna japonica: A, body of male, dorsal view; B, maxilliped; C, pereiopod 1; D, pleopod 1; E, body of male, photohraphs. Scale bars: A, E=1 mm, B=0.1 mm, C, D=0.05mm.