Orientomysis tamurai ( 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 : 694-695

Orientomysis tamurai ( Ii, 1964) comb. nov.

( Figure 11 )

Acanthomysis tamurai Ii 1964: 516–519 , Figure 134; Mauchline and Murano 1977: 45 (list); Müller 1993: 199 (list).

Type locality

Tomiura, near Tateyama, Chiba, central Japan.

Material examined

Two hundred and eighty-eight males (6.0– 10.4 mm), five immature males (5.7–6.3 mm), 64 females (7.3–10.8 mm), 31 immature females (6.3–7.7 mm) and two juveniles (4.7 and 5.7 mm), Tateyama Bay , Chiba, central Japan, 19 June 1978, NSMT-Cr 15599 .

Other material

Syntype: abundant males and females (dried), Tomiura Bay , near Tateyama, central Chiba, Japan, 1 May 1940, Ii’s coll. no. 437 .

Remarks

Orientomysis tamurai is readily distinguishable from the other species of the genus except O. sagamiensis by the telson, with a hiatus in the spine rows of the lateral margin ( Figure 11D, E ).

This species is distinctly different from O. sagamiensis in the size of the apical spines of the telson.

Distribution

This species has been collected only from coastal water of Chiba, central Japan ( Ii 1964; present study) .

Figures

Figure 11. Orientomysis tamurai (Ii, 1964) comb. nov. (A–D) Male (9.8 mm), NSMT-Cr 15599; (E) female (10.4 mm), NSMT-Cr 15599. (A) Penis, lateral; (B) fourth pleopod, posterior; (C) proximal part of uropod, ventral; (D, E) uropod and telson, dorsal.