Metopa koreana Gurjanova 1952

Krapp-Schickel, T., 2009, New and poorly described stenothoids (Crustacea, Amphipoda) from the Pacific Ocean., Memoirs of Museum Victoria 66 (1), pp. 95-116 : 110

publication ID	https://doi.org/ 10.24199/j.mmv.2009.66.12
persistent identifier	https://treatment.plazi.org/id/03818F6E-9038-FF89-FCE6-93B9FC99F88B
treatment provided by	Felipe
scientific name	Metopa koreana Gurjanova 1952
status

Treatment

Metopa koreana Gurjanova 1952 View in CoL

Figs. 13–14 View Figure 13 View Figure 14

M. koreana Gurjanova 1952: 187–188 View in CoL , fig. 13

Material examined:

•off Korea, 42°N, 130' E; 1100m; 2.1.1901. Beautiful and rich material in alcohol (more than 30 males, females, juveniles). (27). ZMUC CRU-20198 .

• 36°45'N, 130°E 1.12.1934 6mm slide, 2 spec. in alcohol (51); „E-Asia“, Suensen leg., 19. 4. 1911: 1 specimen 6mm (22). ZMUC CRU-20194 GoogleMaps .

Length: 6–8mm

Remarks. There are only a few characters different to the very similar, but nearly twice as long type species Metopa clypeata (Krøyer) from the Atlantic: in the type the Gn2 is clearly rectipalmate and the palm seems nearly smooth, while the present material has a palmar corner of about 120° and in males there are two semicircular excavations near the palmar corner, whereas the females or juveniles have only shallow excavations; Gn2 carpus is dorsally similarly but somewhat less sculptured in M. koreana ; Cx2 has an unusual blunt corner of about 120° on the hind margin (vs. linguiform rounded Cx 2 in M. clypeata ); Gn1 carpus is a bit stronger and more prominent in M. clypeata ; A2 peduncle article 4 and article 5 are subequal and very long (vs. much more robust and shorter). P5–7 merus is less lengthened distoposteriorly, the legs are more slender. The differences which are most easily seen are in the usorome: U1,2 peduncle is clearly longer than the rami (vs. peduncle and rami subequal in M. c., see Tandberg & Vader 2009 Fig. 8 View Figure 8 ), U3 has a long, slender peduncle with many robust setae (vs. a characteristical prolongation on the peduncle with few robust setae in M. clypeata ), T with many robust setae (vs. with few robust setae in M. c., see also Tandberg & Vader 2009 figs. 8, 9).