The Amphipod Genus Arcitalitrus (Crustacea: Amphipoda: Talitridae) of New South Wales Forests, With Descriptions of Six New Species R Peart Records of the Australian Museum 2006 58 97 118 67Q8J R Peart, 2006 R Peart 2006 [276,530,153,177] Malacostraca Arcitalitridae Arcitalitrus Animalia Amphipoda 3 100 Arthropoda species bundeena sp. nov.   Figs. 2, 11–14   Type material.  HOLOTYPE, ♀, 15 mm, AMP60957,  December 1999, M. Gray, G. Milledgeand H. Smith.  PARATYPES, many specimens, AMP60958. Paratypesare all from the type locality.    Typelocality. Besidethe Hacking River, Lady Wakehurst Drive, Royal National Park( 34°9'47"S 151°0'55"E), New South Wales, Australia.  Other material examined.  New South Wales, Australia: near locked gate, Fireroad No. 95 Junctionwith  Darkes ForestRoad( 34°11.820'S 150°54.600'E), 2 specimens,  8 December 1999, found in leaf litter, M. Gray, G. Milledgeand H. Smith; Fire road No. 9, Woronora Dam catchment ( 34°11'53"S 150°54'32"E), many specimens,  8–22 December 1999, collected from pitfall traps, M. Gray, G. Milledgeand H. Smith; Fire road No. 9, east of Bee Creek, Woronora Dam catchment ( 34°08'53"S 150°55'37"E), 10 specimens,  8–22 December 1999, collected from pitfall traps, M. Gray, G. Milledgeand H. Smith; 0.1 km northwest of Southern Freeway Overpass, Princes Highway, Woronora Dam catchment ( 34°11'31"S 150°57'58"E), 11 specimens,  8–22 December 1999, collected from pitfall traps, M. Gray, G. Milledgeand H. Smith.   Description. Based on holotypefemale. Bodyshape normally laterally compressed; cuticle calcification absent. Eyelarge (greater than  1⁄  3head length). Antenna 2longer than head and first 3 pereonites; peduncular articles narrow. Mandibleleft lacinia mobilis 4 dentate. Maxillipedouter plate distally acute/arcuate; palp dactylus present and distinct. Pereonite 1sternite without papillose process. Gnathopod 1not sexually dimorphic; simple; merus and carpus not expanded; propodus subrectangular; palm absent; dactylus longer than palm. Gnathopod 2not sexually dimorphic; chelate; narrow; merus and carpus expanded posteriorly; propodus “mitten-like”; palm obtuse; smooth; dactylus shorter than palm. Pereopods 3–7long (½ length of body); simplidactylate. Pereopod 4carpus similar in length to pereopod 3 carpus, dactylus similar to pereopod 3 dactylus. Pereopod 7posterodistal lobe present. Gill 2lobate, not incised. Gills 3–5lobate, smaller than gills 2 and 6. Gill 6lobate,  anterior and posterior margins smooth, apically incised. Oostegiteslong (length greater than 2× width), strongly setose, setae with simple smooth tips. Epimera 1 to 3not convergent. Epimeron 2longer than epimeron 3. Epimeron 3posteroventral margin smooth, posteroventral corner with small subacute tooth. Pleopod 1well developed, biramous, rami shorter than peduncle; inner ramus with 11 articles; outer ramus with 11 articles, outer ramus with more than 10 articles. Pleopod 2well developed, biramous, rami subequal in length to peduncle; inner ramus with 12 articles, inner ramus with more than 10 articles; outer ramus with 12 articles. Pleopod 3reduced, uniramous, rami shorter than peduncle; inner ramus with 1 articles; outer ramus without articles. Uropod 1not sexually dimorphic; peduncle with 5 robust setae on peduncle; inner ramus subequal in length to outer ramus, with 4 robust setae on the margins, with 4 apical robust setae; outer ramus without marginal robust setae, with 4 apical robust setae. Uropod 2not sexually dimorphic; peduncle with 4 robust setae; inner ramus subequal in length to outer ramus, with 3 marginal robust setae, 4 apical robust setae; outer ramus without marginal robust setae, with 4 apical robust setae. Uropod 3peduncle with 1 robust setae; ramus shorter than peduncle, ramus linear (narrowing), with 2 robust setae. Telsonlonger than broad, incised to half the length, with marginal and apical robust setae, with 3–5 robust setae per lobe.   Etymology. Named after the town Bundeena, located on the edge of the Royal National Park, near the typelocality, and treated as a noun in apposition.   Remarks.  Arcitalitrus bundeenaappears to be isolated from other  Arcitalitrusspecies.It is excluded from the “Sylvaticus” species group because it has smooth anterior and posterior margins on gill 6 without an apically incised posterior margin, and the rami of pleopod 1 are shorter than the peduncle. It is excluded from the “Dorrieni” species group because of the small posteroventral cusp on epimeron groups by the large number of pleopod 2 and the large number ramus of uropod 2.  Arcitalitrusspeciesin the genus, except telson incised about halfway. South Wales: Royal National Dam catchment.  Fig. 2.  Arcitalitrus bundeena n.sp., holotype, female,  Fig. 3.  Arcitalitrus moonpar n.sp., holotype, female, specimens, two males, four femalesand one juvenile. He described and illustrated one of the adult males, a specimen 13 mmin length; partially described and made a habitus illustration of one adultfemale, a specimen 15 mmin length, and partially described the immature specimen. All of this material should be considered as a syntypeseries, the whereabouts of which is unknown.     Typelocality. Amongmoist humus and under dead leaves in the gardens of Tresco Abbey, Scilly Isles, Great Britain.   Diagnosis. Gill 6 apically incised. Pleopod 3 rami absent. Uropod 3 peduncle with 2 robust setae. Telson entire, with more than 10 robust setae.   Remarks.  Arcitalitrus dorrieniwas in synonymy with  Ar. sylvaticusuntil Bousfield (1984)resurrected it as a valid species. Friend (1987)distinguished it from  Ar. sylvaticusby gill 6 that is strongly cleft in  Ar. dorrieni. This species was originally described from the ScillyIsles, but is apparently native to New South Wales, where it is known from Blackheath, in the Blue Mountains ( Schellenberg, 1934). Material from Cambewarra Mountain, near Nowra, in the collections of the Australian Museum was identified as  Ar. dorrieniby Dr A. Friend.  Arcitalitrus dorrienidoes not occur in any areas studied during this project.   Arcitalitrus dorrienidiffers from the only other species in the “Dorrieni” species group in having strongly setose oostegites, a subquadrate posteroventral corner on epimeron 3, more than 5 articles on the rami of pleopods 1 and 2, no rami on pleopod 3 and more than 10 dorsal robust setae on the telson.   Distribution. New South Wales: Blackheath, Blue Mountains ( Schellenberg, 1934); Cambewarra Mountain, near Nowra (AM). P60957 1999-12 AM M. Gray & G. Milledge & H. Smith 3 100 1 1 holotype P60958 [121,591,316,339] AM 3 100 1 paratype Australia Royal National Park -34.163055 Beside 19 151.01527 Lady Wakehurst Drive 3 100 1 New South Wales holotype 1999-12-08 1999-12-22 1999-12-08 M. Gray & G. Milledge & H. Smith Australia Southern Freeway Overpass -34.191944 Fire 19 150.96611 Bee Creek 3 100 23 New South Wales United Kingdom Isles Among Tresco Abbey 4 101 1 Isles of Scilly holotype