Arcitalitrus bundeena, R Peart, 2006

R Peart, 2006, The Amphipod Genus Arcitalitrus (Crustacea: Amphipoda: Talitridae) of New South Wales Forests, With Descriptions of Six New Species, Records of the Australian Museum 58, pp. 97-118 : 100-101

Arcitalitrus bundeena n.sp.

Figs. 2, 11–14

Type material. HOLOTYPE, ♀, 15 mm, AM P60957, December 1999, M. Gray, G. Milledge and H. Smith . PARATYPES, many specimens, AM P60958 . Paratypes are all from the type locality.

Type locality. Beside the 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, Fire road No. 95 Junction with Darkes Forest Road (34°11.820'S 150°54.600'E), 2 specimens, 8 December 1999, found in leaf litter, M. Gray, G. Milledge and 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. Milledge and 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. Milledge and 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. Milledge and H. Smith .

Description. Based on holotype female. Body shape normally laterally compressed; cuticle calcification absent. Eye large (greater than 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), strongly 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 with small subacute tooth. Pleopod 1 well developed, biramous, rami shorter than peduncle; inner ramus with 11 articles; outer ramus with 11 articles, outer ramus with more than 10 articles. Pleopod 2 well 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 3 reduced, uniramous, rami shorter than peduncle; inner ramus with 1 articles; outer ramus without articles. Uropod 1 not 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 2 not 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 3 peduncle with 1 robust setae; ramus shorter than peduncle, ramus linear (narrowing), with 2 robust setae. Telson longer 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 type locality, and treated as a noun in apposition.

Remarks. Arcitalitrus bundeena appears to be isolated from other Arcitalitrus species. 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. Arcitalitrus species in the genus, except telson incised about halfway.

South Wales: Royal National Dam catchment.

specimens, two males, four females and one juvenile. He described and illustrated one of the adult males, a specimen 13 mm in length; partially described and made a habitus illustration of one adult female, a specimen 15 mm in length, and partially described the immature specimen. All of this material should be considered as a syntype series, the whereabouts of which is unknown.

Type locality. Among moist 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 dorrieni was in synonymy with Ar. sylvaticus until Bousfield (1984) resurrected it as a valid species. Friend (1987) distinguished it from Ar. sylvaticus by gill 6 that is strongly cleft in Ar. dorrieni . This species was originally described from the Scilly Isles, 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. dorrieni by Dr A. Friend. Arcitalitrus dorrieni does not occur in any areas studied during this project.

Arcitalitrus dorrieni differs 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).