Arcitalitrus sylvaticus (Haswell)

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 : 105

Arcitalitrus sylvaticus (Haswell)

Figs. 6, 24–26

Talitrus sylvaticus Haswell, 1879: 246 , pl. 7, fig. 1; Stebbing, 1906: 524; Sayce, 1909: 30; Chilton, 1916: 83; Clark, 1955: 253–257; Ingle, 1958: 591–592 (probably Ar. dorrieni ); Shoemaker, 1936; Bousfield & Carlton, 1967: 282; Bousfield, 1975: 353 (key).

Talitrus (Arcitalitrus) sylvaticus .– Hurley, 1975: 161.

Arcitalitrus sylvaticus .– Bousfield, 1982: 55; Bousfield, 1984: 206, table 7; Lazo-Wasem, 1983: 213; Lazo-Wasem, 1984: 343; Friend, 1987: 35, 38; Duncan, 1994: 11, pl 1.

Not Talitrus sylvaticus .– Thomson, 1893: 59, pl. iv, figs 1,2,4,7,9,10 (part= Mysticotalitrus cryptus Friend, 1987 ; part= Keratroides vulgaris Friend, 1979 ). Chevreux, 1901: 392, fig. 7 (= Arcitalitrus bassianus Friend, 1987 ). Smith, 1909: 79. Hale, 1929: 218, fig. 216 (= Austrotroides crenatus Friend, 1982 ). Ruffo, 1949: 206 (part = Keratroides vulgaris Friend, 1979 ).

Type material. Neotype. Female, 12.0 mm, AM P60950.

Type locality. Nurragingy Reserve , Rooty Hill (33°46'S 150°51'E), Sydney, Australia .

Description. Based on neotype 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. 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 simple or lobate, smaller than gills 2 and 6. Gill 6 lobate, anterior margin convoluted, subapically incised along posterior margin. Oostegites long (length greater than 2× width), strongly setose, setae with simple smooth tips. Epimera 1 to 3 not convergent. Epimeron 2 subequal in length to epimeron 3. Epimeron 3 posteroventral margin smooth, posteroventral corner with small subacute tooth. Pleopod 1 well developed, biramous, rami subequal in length to peduncle; inner ramus with 13 articles; outer ramus with 10 articles. Pleopod 2 well developed, biramous, rami subequal in length to peduncle; inner ramus with 8 articles; outer ramus with 3 articles, outer ramus with 1–5 articles. Pleopod 3 reduced, rami absent. Uropod 1 not sexually dimorphic; peduncle with 4 robust setae on peduncle; inner ramus subequal in length to outer ramus, with 2 robust setae on the margins, with 1–2 robust setae, with 5 apical robust setae; outer ramus without marginal robust setae, with 4 apical robust setae. Uropod 2 not sexually dimorphic; peduncle with 3 robust setae; inner ramus subequal in length to outer ramus, with 2 marginal robust setae, 5 apical robust setae; outer ramus without marginal robust setae, with 3 apical robust setae. Uropod 3 peduncle with 1 robust seta; ramus shorter than peduncle, ramus linear (narrowing), with 2 robust setae. Telson as broad as long, apically incised, with marginal and apical robust setae, with 3–5 robust setae per lobe.