Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species Author Lowry, J. K. Author Myers, A. A. 0000-0003-3256-2123 School of Biological, Earth and Environmental Sciences, University College Cork, Cork Enterprise Centre, Distillery Fields, North Mall, Cork, Ireland. bavayia @ gmail. com; https: // orcid. org / 0000 - 0003 - 3256 - 2123 bavayia@gmail.com text Zootaxa 2022 2022-02-17 5100 1 1 53 journal article 20608 10.11646/zootaxa.5100.1.1 cabdbbb1-1226-4c2e-b90b-fae0742b5091 1175-5326 6127681 F42DAC62-0E30-442E-A375-87FC02B2CC99 Miyamotoia daitoensis Morino, 2020 ( Fig. 16 ) Miyamotoia daitoensis Morino, 2020: 8 , figs 6, 7. Types. Holotype (NSMT-Cr 26792) ovigerous female 11.0 mm; near the mouth of Hoshino-Do cave, Minami-Daitojima Island, Okinawa . Paratypes , 1 male 7.6 mm (NSMT-Cr 26793), 1 female 9.2 mm (NSMT-Cr 26794), 1 male 7.6 mm , (NSMT-Cr 26795); data as holotype . Type locality. Near the mouth of Hoshino-Do cave, Minami-Daitojima Island, Okinawa , Japan . Ecological type . Forest-hopper. Habitat. 40 m altitude, living among the magnolia Machilus thunbergii , the cinnamon Cinnamomum yabunikkei and Schefflera heptaphylla . Size. Male, 7.6 – 9.2 mm , female, 11 mm . Diagnosis ( male ). Based on Morino (2020) . Labrum without robust setae along anterior margin. Gnathopod 2 dactylus short, recurved distally. Pereopod 4 thickened proximally with notch midway along posterior margin. Uropod 1 peduncle distolateral robust seta present. Uropod 3 ramus shorter than peduncle. Remarks. In M . daitoensis the labrum lacks robust setae (present in M. spinolabrum ) and the pleopodal rami are about 0.3 × as long as peduncles (0.5 × as long in M. spinolabrum ). Distribution. Japan . Okinawa : Minami-Daitojima Island ( Morino 2020 ).