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Thomas, J.D. and Barnard. J.L.. 1991. Kamama wdi/adi. a ncw marine species from Papua New Guinea (Crustacca: Amphipoda: Corophioidea). A/('m oirJ oj file Museum of j'ic/Oria 52: 311 ~318, Kamaka laditadi is a new marine s)">I!cies ora genus heretofore found in frcsh and brdckish waters of Japan, eastern Siberia and Vietnam. Our species was found in almost fully saline seawater in an embayment near Madang. Papua New Guinen. The new species differs from the three previously known species in the thick male antenna 2 <lnd Ihe odd eusirid form of male gnathopoo 2; it also is characterized , but not necessarily uniquely, in the short cOllae 27. sl)arsity of spines on uropods 12, broad apell of mandibular palp and weak merus of percopods 3~4. Introduction The discovery of Kamaka taditadi sp. nov. from marine walers of Papua New Guinea is remarkable because previous species of the genus have been found only in fresh to brackish waters of the Asian mainland from eastern Siberia through Japan to Vietnam. Kamaka is known primarily as a stream. river and lake genus. Our species was collected in almost fully saline scawaters in an embaymen t next to the dock at the Christensen Research Institute in Madang. Papua New Guinea. We take the opportunity to modernize the diagnosis of the genus, provide a new key to the species and list the species and all of their literature citations. The distribution of each species is briefly Slated and geographic codes from Barnard and Barnard (1983) arc appended in brackets. Corophiidac Kamaka Der.lhavin Kamako Dcr:l.havin, 1923: 188 J.L. Barnard, 1973: 19. 1)'pe species. Komako killhae Derzhavm. 1923 (monotypy). Description. Body subcylindrical , slightly depressed, smooth, urosomites 12 coalesced, 3 free from 2 bu l coalesced with telson , marked ventrally by sutures. Rostrum ShOft, supra-antennal line almost absent except in defining ocular lobes, ocular lobes elongate, very produced forward , blunt . antenna I sinus deep. Head longer than pereonites 12 together. Eyes medium, on apices of stalked ocular lobes. Antennae of medium length, I shorter than 2. both slender or antenna 2 stout in male in one species, peduncular article 3 of antenna I scarcely to sl ightly shorter than I, either article I or 2 longest. accessory flagellum absent, main Ilagellar articles very few. Antenna 2 peduncu la r article 3 scarcely elongate, fl agellar artieles 3-7, Epistome not produced anteriorly [new observation], Labrum subrounded, incised, produced forward from epi stome (lateral view). Mandible normal. palp strong, very slender. arlicle 1 elongate. art icle 3 reclolinear or weakly cla vate, shorter than 2. Labium with entire outer lobes, with well developed inner lobes, mandibular lobes short. pointed. Inner plate of mall i]]a I short. without setae, outer plate with 910 spines, palp 2-articulate. Plates of mallilla 2 ordinary, inner plate with only few or no mediomarginal setae. Inner plate of maxilliped with distal plumose setae. outer plate very long, with spines on medial margin, palp with 4 articles, article 2 long. article 3 unlobed, article 4 short. stubby, with medium nail and setae, Coxae Quile variable. either relatively long and lobuliform. or only coxa I large and coxae 2-7 short. weakly overlapping, of various siz.es and shapes, progressively elongate from 2 to 4. coxa I dilated, produced forward, coxa 2 shorter than I, coxa 4 longer or shorter than coxa I, not lobed. coxa 5 al least as long as 4, coxa 7 smaller than anterior coxae. Gnathopods 1-2 diverse. male gnathopod 2 greatly larger than I. gnathopod I poorly sub· chelate, art ide 5 long, sublinear, unlobed. longer

Kamaka taditadi, a new marine species from Papua New Guinea (Crustacea: Amphipoda: Corophioidae)