Peramphithoe namhaensis Kim & Kim, 1988

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

Peramphithoe namhaensis Kim & Kim, 1988

( Fig. 10 )

Peramphithoe namhaensis Kim & Kim, 1988: 125 , figs 11–12.

Material Examined. 1 3, Geojin, Gosung-gun, 24 February 2005 (Y.H. Kim), by fishing net; 1 3, Yongdong-ri, Goheong-gun, 22 June 2008 (Y.H. Kim), by light trap; 2 3, Sageunjin, Gangreung-si, 11 July 2008 (S.S. Hong), by D-frame net; 1 3, Daraedo Is., Beolgyo-eup, 23 June 2009 (Y.H. Kim and K.S. Lee), by hand net; 1 Ƥ, Namangdo Is., Beolgyo-eup, 23 June 2009 (Y.H. Kim and K.S. Lee), by hand net; 1 3, 1 Ƥ, Dolsando Is., Yeosu-si, 25 June 2009 (Y.H. Kim), by hand net.

Previous Korean records. Sangchujado Is., Seogwipo, Yeoseodo Is. ( Kim & Kim 1988).

Type locality. Sangchujado Is., Jeju-si, Korea.

Diagnosis. Head longer than wide. Eye circular, medium size. Lateral cephalic lobes truncate apically. Epimeral plates 1–3 subquadrate posteroventrally. Antenna 1 weakly setose, peduncular article 1 longer than article 2, with 2 posterodistal spines. Antenna 2 about half length of antenna 1, peduncular article 4 slightly longer than article 5; flagellum setose, more than half length of peduncle. Gnathopod 1, propodus subrectangular, longer than carpus; dactylus falcate, with 1 penicillate seta anteroproximally. Gnathopod 2, male, propodus massive, tapering distally, anterior margin gently curved, posterior margin straight, crenulated, with crenulations larger distally; dactylus strong, elongate, subequal in length to propodus, with 1 penicillate seta anteroproximally. In female, propodus about 0.5 × as wide as long, palm transverse. Pereopod 5 basis subcircular, expanded posteriorly, slightly wider than long. Uropod 3 peduncle stubby, less than twice the length of rami.

Molecular data. CO1 gene sequences (GenBank accession numbers JN575614 – JN575620 ) were obtained from seven specimens. Sequence alignment was straightforward without any insertion or deletion. Intra-specific variation of the CO1 gene sequence of the species ranged between 0.2 and 1.1%, while inter-specific variation ranged from a low of 9.1% ( P. namhaensis and P. chujaensis sp. nov.) to a high of 11.1% ( P. namhaensis and P. eoa ) ( Figure 12 , Table 2 ).

Distribution. Korea (east and south coasts).

Figures

FIGURE 10. Peramphithoe namhaensis Kim & Kim, 1988, male, 12.5 mm, Geojin, Gosung-gun, Korea: A, antenna 2; B, carpus, propodus and dactylus of gnathopod 1; C, propodus and dactylus of gnathopod 2, arrows point to uneven ventral margin; 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 %.