The genus Microptila Ris (Trichoptera, Hydroptilidae) in Japan Author Ito, Tomiko text Zootaxa 2017 4232 1 104 112 journal article 36543 10.11646/zootaxa.4232.1.7 23068eb9-dd4a-4eb8-a613-10fe4bfba459 1175-5326 292743 7C3A4400-CCA5-4E9E-82BA-F8B931BC3F9B Microptila genka sp. nov. ( Figs 2 , 4 B, 5) Diagnosis . The male of this species is similar to those of Microptila orienthula and the Vietnamese M. dironga Oláh and Johanson 2010 , but can be distinguished from these as follows: (1) Segment IX has a broader tegmental bridge ( cf . the very narrow bridge in M. orienthula and M. dironga ), with the dorsal midline about 1/5 as long as segment IX ( Fig. 2 B); (2) the subgenital plate is rounded caudally ( Figs. 2 B, 2D, cf . the plate has a tiny U- or Vshaped excavation caudally in M. orienthula ); and (3) the inferior appendages are stout with thick setose ridges mesally ( Figs. 2 A, 2C, 2E, cf . the rather slender appendages in M. dironga ). Females of this species are similar to those of M. orienthula , but can be distinguished from the latter by the presence of a triangular median process on the caudal margin of segment VII ( Fig. 2 G, cf . the caudal margin of segment VII is wholly convex in M. orienthula ). Male . Length of each forewing and hind wing 1.6–1.7 mm and 1.4–1.5 mm , respectively (n = 3). Antennae each 19-segmented and 0.5–0.6 mm long (n = 3). Genitalia ( Figs. 2 A–2F). Segment IX (IX) annular, in dorsal view ( Fig. 2 B) excavation of anterior margin semi-circular, excavation of posterior margin broadly concave; transverse tegmental bridge broad, dorsal midline about 1/5 as long as segment IX; in ventral view ( Fig. 2 C) excavation of anterior margin broadly triangular, excavation of posterior margin wide and shallow. Tergite X (t X) semimembranous, transparent, with lightly sclerotized lateral and caudal margins, quadrate, with deep and wide triangular excavation caudally in dorsal view ( Fig. 2 B). Subgenital plate (sg plate) twice as long as tergite X, elongate ovate, rounded caudally, semimembranous with lightly sclerotized lateral margins ( Figs. 2 A, 2B, 2D). Inferior appendages (inf app) large, setose, without any branches; in ventral view ( Fig. 2 C) each with basal 2/3 stout, apical 1/3 slender, apex incurved and acute; in ventromesal view ( Fig. 2 E) basal 2/3 with longitudinal setose ridge mesally and apical 1/3 rectangular with strongly sclerotized ridge. Phallus long with slender, elongate titillator (ti) arising near apical 1/4, titillator encircling phallus 1.5 times ( Fig. 2 F). Female ( Fig. 2 ). Length of each forewing and hind wing 1.6–1.8 mm and 1.3–1.4 mm , respectively (n = 4). Antennae each 19-segmented and 0.5–0.6 mm long (n = 4). Abdominal segments I–VII densely covered with long thick setae. Segment VII (VII) tergite and sternite fused laterally, caudal margin with triangular median process in ventral view ( Fig. 2 G). Segment VIII almost as long as segment VII, often withdrawn into segment VII. Holotype : male, Japan , Ryukyu Islands , Okinawa-jima , Nago-shi , Genka , hygropetric zone near Hogenhashi , 26˚36’16” N, 128˚04’29” E, 65 m a.s.l. , 8.iv.2011 , T. Ito (CBM-ZI 151359). Paratypes : 2 males, 1 female, same data as holotype (CBM-ZI 151360–151362). Other specimens examined . 1 male , same data as holotype . Japan , Ryukyu Islands , Ishigaki-jima : 2 males , 3 females , hygropetric zone beside Nagura-gawa , 18.iii.2016 , T. Ito ; 1 male , 1 female , unnamed waterfall beside foot path of Mt. Omoto-dake , 20.iii.2016 , T. Ito. Habitat ( Fig. 4 B). Adults of this species were collected at hygropetric zones and waterfalls. Etymology . The specific name refers to the locality ( nakama , a noun) where the type specimens were collected. Distribution ( Fig. 5 ). Japan (Ryukyu Islands: Okinawa-jima, Ishigaki-jima). Japanese name . Genka-mikuro-himetobikera.