Descriptions of a new species of Hydroptila Dalman and the mature larva of a species of Stactobiella Martynov from Japan (Trichoptera, Hydroptilidae) Author Ito, Tomiko text Zootaxa 2022 2022-02-24 5104 1 137 142 journal article 20472 10.11646/zootaxa.5104.1.8 b877e947-dec3-4f7c-82b0-410aa6fe09f3 1175-5326 6258163 D253FE6C-5501-424D-AEC9-F5E28E232993 Hydroptila hattorii sp. nov. ( Fig. 1 ) Diagnosis . The male of this species is distinctive in having on the dorsal plate slender lateral arms which are connected to each other at their tips and giving the appearance of a ‘bottle opener’ in dorsal and ventral views. Male ( Fig. 1 ). Wings brown in alcohol specimen. Forewings each 2.2 mm in length, hind wing 2.0 mm. Antennae brown, length 1.2 mm , each 22-segmented. Ventral process of segment VII long with expanded spiny apex. Male genitalia ( Figs 1B–E ). Segment IX largely retracted in segment VIII, with roundish lateral lobe (lat lobe) on each side at posterolateral margin and short stump-like ventral lobe (vent lobe) near posteroventral corner; both lobes bearing several thick, long setae apically. Dorsal plate (dor plate) sub-rectangular, convex laterally, semimembranous apically with slender long lateral arms (lat arm); arms divergent from base, angled sharply mesad at mid-length, their apices overlying each other medially, appearing as ‘bottle opener’ in dorsal and ventral views. Paired transparent leaf-like lobes (leaf lobe) and short, broad membranous lobe (mem lobe) between dorsal plate and subgenital plate (sub plate). Subgenital plate in form of paired lobes transversely divergent basally and abruptly directed posterad at mid-length; each lobe tipped apically by short seta. Inferior appendages (inf app) almost parallel-sided, in lateral view somewhat widened at apical 1/3, subacute dorso-mesally. Phallic apparatus almost straight with titillator (tit) at middle; titillator short, curled 1.5 times; aedeagus (aed) slender, almost straight; subapical process (sub pr) thin, semi-membranous, slightly shorter than aedeagus, acute apically. Female and immature stages . Unknown. Holotype : Male , Japan , Honshu , Iwate , Ôshû-shi , Koromogawa-ku , Ômori ( 39.0428 N , 141.0133 E , 200 m above sea level , 21.vi.1997 , T . Hattori, light trap (CBM-ZI 183208). Etymology . This species is dedicated to the late Toshio Hattori, Shizuoka , who gifted me many valuable caddisfly specimens, including the present species, and passed to me much information on caddisflies. Distribution . Japan (Honshu: Iwate ). Japanese name . Hattori-hime-tobikera.