The Amphipod Genus Arcitalitrus (Crustacea: Amphipoda: Talitridae) of New South Wales Forests, With Descriptions of Six New Species Author R Peart text Records of the Australian Museum 2006 58 97 118 journal article 2201-4349 Arcitalitrus moonpar n.sp. Figs. 3 , 15 –17 Type material . HOLOTYPE , ♀ , 9.0 mm, AM P60962, December 1999 , M. Gray , G. Milledge and H. Smith . PARATYPES , 30 specimens AM P60963 . Paratypes are all from the type locality. Type locality . Three km southwest of Mangrove Mountain ( 33°22'28"S 151°15'39"E ), New South Wales . Other material examined . New South Wales , Australia : end of Darkes Forest , Woronora Dam Catchment ( 34°12'51"S 150°54'E ), 8 specimens , 8–22 December 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; junction of Urumbilum Creek road and Loudens road, Orara State Forest ( 30°19'35"S 152°55'00"E ), 3 specimens , 9–23 December 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; end of Little North Arm road, west bank of Rosewood River , Dorrigo National Park ( 30°24'06"S 152°46'18"E ), 35 specimens , 10–24 November 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; beside Hacking River , Lady Wakehurst Drive, Royal National Park ( 34°09'47"S 151°00'55"E ), 40 specimens , 6–20 December 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; junction of Moonpar and Mills roads, Moonpar State Forest ( 30°14'36"S 152°37'32"E ), 15 specimens , 9–23 December 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; 2 km south southwest of Bostobrick , Christophersons Mountain ( 30°17'45"S 152°37'04"E ), 55 specimens , 9–23 November 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; nearly 0.3 km east of Artillery Hill , Sir Bertram Stevens Drive, Royal National Park ( 34°04'55"S 151°03'40"E ), 1 specimen , 6–20 December 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith ; Horseshoe road, 3.5 km southeast of Thora , Scotchman State Forest ( 30°26'25"S 152°47'30"E ), 1 specimen , 10–24 November 1999 , collected from pitfall traps , M. Gray , G. Milledge and H. Smith . Description . Based on holotype female. Body shape normally laterally compressed. Cuticle calcification absent. Eye medium ( 1 ⁄ 5 – 1 ⁄ 3 head length). Antenna 2 longer than head and first 3 pereonites; peduncular articles narrow. Mandible left lacinia mobilis 4 dentate. Maxilliped outer plate distally acute/arcuate; palp dactylus present and distinct. Pereonite 1 sternite without papillose process. Gnathopod 1 not sexually dimorphic; simple; merus and carpus not expanded; propodus subrectangular; palm absent; dactylus longer than palm. Gnathopod 2 not sexually dimorphic; chelate; narrow; merus and carpus expanded posteriorly; propodus “mitten-like”; palm obtuse; smooth; dactylus shorter than palm. Pereopods 3–7 long (½ length of body); simplidactylate. Pereopod 4 carpus similar in length to pereopod 3 carpus, dactylus similar to pereopod 3 dactylus. Pereopod 7 posterodistal lobe present. Gill 2 lobate, not incised. Gills 3–5 lobate, smaller than gills 2 and 6. Gill 6 lobate, anterior and posterior margins smooth, apically incised. Oostegites long (length greater than 2× width), weakly setose , setae with simple smooth tips. Epimera 1 to 3 not convergent. Epimeron 2 longer than epimeron 3. Epimeron 3 posteroventral margin smooth, posteroventral corner rounded . Pleopod 1 well developed, biramous, rami shorter than peduncle; inner ramus with 6 articles; outer ramus with 5 articles, outer ramus with 1–5 articles. Pleopod 2 well developed, biramous, rami shorter than peduncle; inner ramus with 5 articles, inner ramus with 1–5 articles; outer ramus with 4 articles. Pleopod 3 reduced, uniramous, rami shorter than peduncle; inner ramus with 1 articles; outer ramus without articles. Uropod 1 not sexually dimorphic; peduncle with 4 robust setae on peduncle; inner ramus shorter than outer ramus, with 3 robust setae on the margins, with 4 apical robust setae; outer ramus without marginal robust setae, with 2 apical robust setae . Uropod 2 not sexually dimorphic; peduncle with 3 robust setae; inner ramus subequal in length to outer ramus, with 1 marginal robust seta, 5 apical robust setae; outer ramus without marginal robust setae, with 4 apical robust setae. Uropod 3 peduncle with 1 robust seta; ramus shorter than peduncle, ramus bud-like (broad), with 2 robust setae. Telson as broad as long, entire, with marginal and apical robust setae, with 3–5 robust setae per lobe. Etymology . Named after Moonpar State Forest, within the range of Ar. moonpar and treated as a noun in apposition. Habitat . Forest floor leaf-litter. Remarks . Arcitalitrus moonpar is a member of the “Dorrieni” species group. It differs from the only other species in the group, Ar. dorrieni , in having weakly setose oostegites, a rounded posteroventral corner on epimeron 3, a reduced number of articles on the outer ramus of pleopod 1 and both rami of pleopod 2, a uniramous pleopod 3 and 8 (6 to 10) dorsal robust setae on the telson. Distribution . New South Wales : southwest of Mangrove Mountain; on the shores of the Hacking River, Royal National Park; Woronora Dam Catchment; Orara State Forest; Dorrigo National Park; Moonpar State Forest; Christophersons Mountain; Scotchman State Forest.