Orientomysis hwanhaiensis ( Ii, 1964 ) Fukuoka & Murano, 2005

Fukuoka, Kouki & Murano, Masaaki, 2005, A revision of East Asian Acanthomysis (Crustacea: Mysida: Mysidae) and redefinition of Orientomysis, with description of a new species, Journal of Natural History 39 (9), pp. 657-708 : 669-671

Orientomysis hwanhaiensis ( Ii, 1964) comb. nov.

( Figure 2 ) Acanthomysis hwanhaiensis Ii 1964: 486–488 , Figure 124; Mauchline and Murano 1977:

44 (list); Shen et al. 1989: 217–219, Figure 14; Müller 1993: 192 (list); Jo and Ma

1996: 815, Figure 9 ; Wang and Liu 1997: 216; Liu and Wang 2000: 234–236,

Figure 85; Modlin and Orsi 2000: 693–694, Figures 1 , 2 .

Type locality

Ryubai Island, Haeju Bay, Hwanghaenamdo, western Korea.

Material examined

Syntype: 20 males (damaged, up to 12.4 mm) and 61 females (damaged, up to 13.2 mm), Ryubai Island , Haeju Bay, Hwanghaenamdo, western Korea, 13 April 1936, Ii’s coll. no. 33 .

Others. Three males (7.0– 9.8 mm) and five females (8.8–10.7 mm), 31 ° 50.59N, 124 ° 02.09E, the East China Sea, 42 m, bottom net, 20–21 May 1968, NSMT-Cr 15559. Eight males (damaged) and two females (damaged), Boryong, Chungchongnamdo, western Korea, dip net by diver, 1 April 1992, on loan from S.-G. Jo .

Remarks

The number of minute spines inserted between inner and outer pairs of larger apical spines on the telson is one or two, rarely three ( Figure 2 ) against one in the original description by Ii (1964).

This species is distinguishable from the other species of Orientomysis by the armature of the telson: the apical margin is armed with two pairs of large spines, which are subequal to the larger spines on the lateral margin, and with one to three minute spines between the inner and outer larger spines.

Distribution

This species has been recorded from southern and western coasts of Korea ( Ii 1964; Jo and Ma 1996) and Chinese coast of the Bohai Sea, the Yellow Sea and the East China Sea ( Shen et al. 1989; Wang and Liu 1997; present study). Modlin and Orsi (2000) reported this species from the San Francisco Bay estuary, California, resulting from the transportation with ship ballast water from East Asia.

Figures

Figure 1. Orientomysis aspera (Ii, 1964) comb. nov. Telson, dorsal. (A) Male (8.0 mm), Ise Bay (34°55.109N, 136°46.609E), NSMT-Cr 15553; (B) female (8.6 mm), Ise Bay (34°55.109N, 136°46.609E), NSMT-Cr 15553.

Figure 2. Orientomysis hwanhaiensis (Ii, 1964) comb. nov. (A, B) Telson, dorsal; (C–F) distal end of telson, dorsal. (A) Male (12.2 mm), syntype; (B) female (13.6 mm), syntype; (C) male (9.8 mm), East China Sea, NSMT-Cr 15559; (D) male (7.5 mm), East China Sea, NSMT-Cr 15559; (E) female (10.7 mm), East China Sea, NSMT- Cr 15559; (F) female (10.6 mm), East China Sea, NSMT-Cr 15559.

Figure 9. Orientomysis sagamiensis (Nakazawa, 1910). (A–J) Male (15.6 mm), NSMT-Cr 15598; (K) female (17.0 mm), NSMT-Cr 15598. (A) Third thoracic limb, posterior; (B) eighth thoracic limb, posterior; (C) penis, lateral; (D–H) first to fifth pleopods; (I) basal part of uropod, ventral; (J) uropod and telson, dorsal; (K) telson, dorsal.