Peramphithoe tea ( Barnard, 1965 )

Kim, Young-Hyo, Hong, Soon-Sang, Conlan, Kathleen E. & Lee, Kyung-Sook, 2012, The genus Peramphithoe Conlan & Bousfield, 1982 from Korean waters (Crustacea: Amphipoda: Ampithoidae), Zootaxa 3400, pp. 1-19 : 16-18

Peramphithoe tea ( Barnard, 1965)

( Fig. 11 )

Ampithoe tea Barnard, 1965: 30 , figs 19–21.

Peramphithoe tea . — Conlan & Bousfield, 1982: 65, fig. 14. — Kim & Kim, 1988: 129, figs 13–14. — Kim, 1991: 74. — Kim et al., 2005: 3.

Material examined. 3 3, 1 Ƥ, Daejung, Jejudo Is., 8 May, 2002 (Y.H. Kim), by fishing net; 1 3, Jinbok-ri, Uljin, 9 July 2002 (Y.H. Kim), by hand net; 1 3, 2 Ƥ, Namdong-ri, Jindo Is., 29 June 2004 (Y.H. Kim), by hand net; 2 Ƥ, Singi, Jindo Is., 30 June 2004, (Y.H. Kim), by light trap; 1 Ƥ, Jangchon, Baekryeongdo Is., 14 July 2007 (S.S. Hong), by light trap; 10 specimens, Pado-ri, Taean-gun, 20 March 2009 (Y.H. Kim & S.S. Hong), by hand net.

Previous Korean records. Gadeokdo is. ( Kim & Kim 1988), Gujora, Geojedo Is. ( Kim 1991), Beolpo, Jindo Is. ( Kim et al. 2005).

Type locality. Santa Catalina Island, Southern California, 33° 22ʹ 17ʺN, 118° 20ʹ 55ʺE.

Diagnosis. Head as wide as long. Eye subcircular, medium. Lateral cephalic lobes roundly protruded. Epimeral plates 1–3 subquadrate posteroventrally. Antenna 1 weakly setose, peduncular article 1 slightly longer than article 2, with posterodistal spine; flagellum elongate, less than 3 x the length of peduncle. Antenna 2 moderately setose, short, about half length of antenna 1, peduncular article 4 longer than article 5; flagellum short, about half length of peduncle. Gnathopod 1, propodus subrectangular, longer than carpus; dactylus falcate, strongly overlapping palm, with 1 penicillate seta anteroproximally. Gnathopod 2, male, propodus massive, decreasing in width apically, posterior margin nearly straight, finely creunlated, with 1 protruding bump distally; dactylus falcate, shorter than propodus, with 1 penicillate seta anteroproximally. In female, gnathopod 2 propodus about 0.6 × as wide as long, palm transverse. Pereopod 5 basis subcircular, as wide as long. Pereopods 6–7 homopodous, basis elongate ovate, posterodistal margins angular, subpointed; carpi and propodi densely setose posteriorly. Uropod 3 peduncle stubby, more than twice the length of rami.

Molecular data. CO1 gene sequences (GenBank accession numbers JN575606 – JN575610 ) were obtained from five specimens. Sequence alignment was straight forward without any insertion or deletion. Intra-specific variation of the CO1 gene sequence of the species ranged between 0.1 and 0.8%, while inter-specific variation ranged from a low of 10.0% ( P. tea and P. namhaensis ) to a high of 13.5% ( P. tea and P. e o a) ( Figure 12 , Table 2 ).

Distribution. North Pacific: Korea, Japan, Canada, US.

Figures

FIGURE 11. Peramphithoe tea (Barnard, 1965), male, 12.2 mm, Pado-ri, Taean-gun, Korea: A, antenna 2; B, carpus, propodus and dactylus of gnathopod 1; C, propodus and dactylus of gnathopod 2; D, coxa and basis of pereopod 6; E, propodus and dactylus of pereopod 6; F, uropod 1; G, uropod 3; H, telson. Scale bars = 0.5 mm (A – E), 0.4 mm (F, G), 0.2 mm (H).

FIGURE 12. Neighbor-joining tree of the five Korean species of peramphithoids with Ampithoe valida the outgroup, based on 657 base pairs of mtCO 1 gene. Values at nodes indicate bootstrap values above 50 %.