Arcitalitrus Hurley, 1975

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 : 98

Arcitalitrus Hurley

Arcitalitrus Hurley, 1975: 161 .– Friend, 1987: 35.

Type species. Talitrus sylvaticus Haswell, 1879 , original designation.

Diagnosis. Gnathopod 2 not sexually dimorphic. Maxilliped outer plate distally acute/arcuate. Pleopods 1 and 2 well developed, pleopod 3 reduced.

Species composition. Arcitalitrus contains nine species: Ar. bassianus Friend, 1987 ; Ar. belbucca n.sp.; Ar. bundeena n.sp.; Ar. dorrieni ( Hunt, 1925) ; Ar. moonpar n.sp.; Ar. nana n.sp.; Ar. orara n.sp.; Ar. sylvaticus ( Haswell, 1879) ; Ar. thora n.sp.

Key to the species of the genus Arcitalitrus 1 Epimeron 3 posteroventral margin serrulate ............................................... Arcitalitrus bassianus

—— Epimeron 3 posteroventral margin smooth ................................................................................... 2 2 Epimeron 2 subequal in length to epimeron 3 ............................................................................... 3

—— Epimeron 2 longer than epimeron 3 .............................................................................................. 6 3 Gill 6 anterior margin convoluted, subapically incised ................................................................. 4

—— Gill 6 posterior margin convoluted, apically incised .......................................... Arcitalitrus thora 4 Pleopod 3 rami absent .................................................................................................................... 5

—— Pleopod 3 uniramous ............................................................................................ Arcitalitrus nana 5 Telson entire ........................................................................................................ Arcitalitrus orara

—— Telson apically incised ................................................................................. Arcitalitrus sylvaticus —— Telson deeply incised ..................................................................................... Arcitalitrus belbucca

6 Epimeron 3 posteroventral corner with subacute tooth ............................... Arcitalitrus bundeena

—— Epimeron 3 posteroventral corner rounded ................................................... Arcitalitrus moonpar —— Epimeron 3 posteroventral corner subquadrate .............................................. Arcitalitrus dorrieni