A phylogeny and classification of the Talitroidea (Amphipoda, Senticaudata) based on interpretation of morphological synapomorphies and homoplasies Author Myers, A. A. School of Biological, Earth and Environmental Sciences, University College Cork, Cork Enterprise Centre, Distillery Fields, North Mall, Cork, Ireland. Author Lowry, J. K. Australian Museum Research Institute, 1 William Street, Sydney, NSW 2010, Australia. text Zootaxa 2020 2020-05-14 4778 2 281 310 journal article 22157 10.11646/zootaxa.4778.2.3 e1c66730-b0ab-402e-a48d-61335c1dbd0e 1175-5326 3826328 C547A832-4C3D-4314-9611-5AA6C32FE986 Arcitalitridae fam. nov. Type genus. Arcitalitrus Hurley, 1957 . Included genera (15). Albidiator Lowry & Myers, 2019a ; Arcitalitrus Hurley, 1975 ; Austrotroides Friend, 1982 ; Calviator Lowry & Myers, 2019a ; Fleuriella Lowry, Myers & Nakano, 2019 ; Hermaniator Lowry & Myers, 2019a ; Insulariator Lowry & Myers, 2019a ; Keratroides Hurley, 1975 ; Lutruwitiator Lowry & Myers, 2019a ; Myanmarorchestia Hou, 2017 ; Mysticotalitrus Hurley, 1975 ; Richardsoniella Lowry, Myers & Nakano, 2019 ; Solitroides Suzuki, Nakano, Nguyen, Nguyen, Morino & Tomikawa, 2017 ; Swaziator Lowry & Myers, 2019a ; Talitriator Methuen, 1913 . Category. Femipods and semi-mascupods. Ecological type . Riparian-hoppers, field-hoppers, forest-hoppers and ground-hoppers. Distribution. Australia and Papua New Guinea ; South Africa ; Atlantic South America and Indonesia and Malaysia . Diagnostic description. Antenna 1 long, reaching to at least midpoint of peduncular article 5 of antenna 2 or short, not reaching midpoint of peduncular article 5 of antenna 2. Maxilliped palp article 2 without distomedial lobe; article 4 small, distinct . Gnathopod 1 posterior margin of merus, carpus and propodus each without palmate lobes or posterior margin of merus, carpus and propodus each with palmate lobes or posterior margin of some but not all merus, carpus and propodus with palmate lobes; propodus subrectangular, enlarged subrectangular or subrectangular, tapering distally. Gnathopod 2 mitten-shaped . Pereopods 3–7 simplidactylate . Pereopod 4 dactylus basidactylate . Pereopod 5 dactylus not inflated. Pereopod 6 subequal in length or shorter than pereopod 7. Epimera 1–3 slits absent. Uropods 1–2 rami without apical spear-shaped setae. Uropod 1 male exopod not sexually dimorphic; exopod without marginal robust setae. Uropod 3 ramus shorter than peduncle. Telson with 1–9 robust setae per lobe.