Orientomysis aspera ( 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 : 663-667

Orientomysis aspera ( Ii, 1964) comb. nov.

( Figure 1 ) Acanthomysis aspera Ii 1964: 492–495 , Figure 126; Mauchline and Murano 1977: 44 (list); Shen et al. 1989: 215–217, Figure 13 ; Müller 1993: 190 (list); Jo and Ma

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1996: 811–813, Figure 7 ; Modlin and Orsi 1997: 443–445; Wang and Liu 1997: 215; Liu and Wang 2000: 231–233, Figure 83.

Type locality

Atsu, mouth of Kojima Bay, Seto Inland Sea, western Japan.

Material examined

Syntype: 33 males (7.2–13.6 mm) and 17 females (8.5–11.1 mm), Atsu , mouth of Kojima Bay, Okayama, western Japan, 18 March 1936, Ii’s coll. no. 216 .

Others. One immature female (7.9 mm), Ryubai Island, Haeju Bay, Hwanghaenamdo, western Korea, 13 April 1936, Ii’s coll. no. 33 (part). Two males (6.2 and 6.4 mm) and two females (5.3 and 6.4 mm), Ariake Sea, Kyusyu, western Japan, mud, 5 m, 7 October 1975, coll. T. Takita, NSMT-Cr 15549. One male (9.8 mm), Yongyoodo, Inchon, western Korea, dip net by diver, 27 April 1986, on loan from S.-G. Jo. Five males (7.0– 8.3 mm) and seven females (7.5–10.2 mm), 34 ° 41.009N, 136 ° 43.209E, Ise Bay , central Japan, 35.0– 36.1 m, bottom net, 15 June 1996, TR/ V Seiyo-Maru cruise, NSMT-Cr 15550. Seven males (6.0– 6.8 mm) and 10 females (5.7–7.3 mm), 34 ° 44.009N, 137 ° 14.009E, Mikawa Bay , central Japan, 11.3 m, bottom net, 15 June 1996, TR/ V Seiyo-Maru cruise, NSMT-Cr 15551. Seven males (7.4–8.6 mm) and seven females (6.2–8.7 mm), 34 ° 49.979N, 136 ° 47.239E, Mikawa Bay , central Japan, 23.2 m, bottom net, 16 June 1996, TR/ V Seiyo-Maru cruise, NSMT-Cr 15552. Eleven males (7.3–9.0 mm) and nine females (7.1– 8.5 mm), 34 ° 55.109N, 136 ° 46.609E, Ise Bay , central Japan, 24.1 m, bottom net, 16 June 1996, TR/ V Seiyo-Maru cruise, NSMT-Cr 15553. Fifty-five males (5.1–7.8 mm), 10 immature males (4.3–5.1 mm), 47 females (5.1–7.5 mm) and 12 immature females (3.7– 5.1 mm), 34 ° 59.089N, 136 ° 44.379E, Ise Bay , central Japan, 15 m, bottom net, 15 July 1996, R / V Tansei-Maru cruise, NSMT-Cr 15554. Seven males (8.0– 10.9 mm), three immature males (4.5–7.1 mm), seven females (8.0– 10.4 mm) and one immature female (4.5 mm), 35 ° 33.009N, 139 ° 55.009E, Tokyo Bay, central Japan, 25.0 m, bottom net, 15 April 1997, TR/ V Seiyo-Maru cruise, NSMT-Cr 15555. One immature female (5.0 mm), 35 ° 35.009N, 140 ° 00.009E, Tokyo Bay, central Japan, 13.5 m, bottom net, 15 April 1997, TR/ V Seiyo-Maru cruise, NSMT-Cr 15556. One male (8.2 mm), 34 ° 38.889N, 135 ° 21.889E, Osaka Bay , central Japan, 14 m, bottom net, 16 June 1997, TR/ V Seiyo- Maru cruise, NSMT-Cr 15557. Seven males (4.3–5.1 mm), two immature males (3.2 and 3.9 mm) and nine females (4.2–6.6 mm), Omura Bay , Nagasaki, western Japan, date unknown, coll. T. Takita , NSMT-Cr 15558 .

Remarks

Ii (1964) described the outer pair of the apical spines of the telson as more strongly curved medially in females than in males. In the present specimens a similar feature is observed. Furthermore, these apical spines of the female are larger and more robust than those of the male ( Figure 1 ).

This species most closely resembles O. aokii , but is distinguished from it only by the hispid body (smooth in O. aokii ).

Distribution

This species is recorded from the Japanese embayments, Kojima Bay ( Ii 1964), Tokyo Bay ( Ii 1964; present study), the Ariake Sea, Omura Bay, Ise Bay, Mikawa Bay and Osaka Bay (present study); the Chinese coastal waters of the Bohai Sea (the Gulf of Zhili), the Yellow Sea and the East China Sea ( Shen et al. 1989; Wang and Liu 1997); southern and western coastal waters of Korea ( Jo and Ma 1996); and Sacramento-San Joaquin estuary, California ( Modlin and Orsi 1997). The occurrence in the Sacramento-San Joaquin estuary of this species is surely a result of the transportation from Asian waters with ballast water of ships ( Modlin and Orsi 1997).

The present specimens from Japan were collected from depths of 10–40 m in eutrophic embayments.

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 7. Orientomysis rotundicauda (Liu and Wang, 1980) comb. nov. (A, B, F) Female (4.9 mm), South China Sea; (C–E) male (damaged), South China Sea; (G, H), male (7.3 mm), Tateyama Bay, Pacific, NSMT-Cr 15590; (J), male (6.9 mm), Japan Sea side of Aomori, NSMT-Cr 11080. (A, G, J) Anterior part of body, dorsal; (B) maxilla, posterior; (C) penis, lateral; (D) fourth pleopod, anterior; (E) distal part of fourth pleopod, anterior; (F) uropod and telson, dorsal; (H) distal part of fourth pleopod, posterior; (I) telson, dorsal.

Figure 13. Orientomysis arenaria sp. nov. (A–J) Male (9.6 mm), holotype, NSMT-Cr 15618; (K) female (17.8 mm), paratype, NSMT-Cr 15619. (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, K) uropod and telson, dorsal.