Hydroptila dorsoprocessuata Botosaneanu 1993

Ito, Tomiko & Shimura, Noriyoshi, 2019, Notes on six microcaddisfly species (Trichoptera: Hydroptilidae) recorded for Japan, one a newly described species, Zootaxa 4629 (1), pp. 26-38 : 26-38

Hydroptila dorsoprocessuata Botosaneanu 1993

( Fig. 2 )

Hydroptila dorsoprocessuata Botosaneanu 1993 , male, 187–188, Russia (South Siberia); Arefina et al. 1997, 44, 45, male, Russia (South Primorye); Ivanov 2011, 195.

Revised description. Adult. Wings brown, some light brown patterns present in forewings, but often indistinct in alcohol; light brown dots absent in hind wings. Wing length: males (n = 5), forewings each 2.4–2.7 mm, hind wings each 2.0– 2.4 mm; females (n = 5) forewings each 2.6–2.9 mm, hind wings each 2.4–2.7 mm. Antennae brown with light bands at middle and apices; in male (n = 5), each 1.3–1.5 mm long, 34–36-segmented; in female (n = 5), each 0.8–1.0 mm long, 24–25-segmented. Short ventromesal process on abdominal segment VII in male and on VI in female.

Male ( Figs 2 A–2D). Segment IX short with well-produced anterior margin, long mid-dorsal process (d.pr.) on posterodorsal margin and pair of membranous ventrolateral processes (l.p.) on posterior margin, ventrolateral process distinct in ventral view but often indistinct in lateral view. Dorsal plate (d.pl.) long, subrectangular, with shallow apical cleft in dorsal view, mostly membranous with sclerotized lateral margins. Subgenital plate (s.pl.) broadly triangular in ventral view. Inferior appendages (i.a.) slender at basal 1/3 and expanded at apical 2/3, in lateral view with rounded, setose apical margins; in ventral view elongate-triangular. Phallic apparatus with constriction at 1/3 length, titillator absent, aedeagus (ae.) and subapical process (sub.pr.) directed caudad.

Female ( Figs 2 E–2H). Segment VIII with anterolateral margin slightly produced in lateral view, posterior margin with 3–4 twisted marginal setae; its internal sclerite large pentagonal with well sclerotized anterior and posterior bands. Bursa copulatrix narrow, ovate.

Specimens examined. Japan, Honshu: Aichi: 5 males, 5 females, Shinshiro-shi, Toyooka, Ichinose, Ôtsutani-gawa, near river mouth, 13.vi.2015, H. Nishimoto, light trap. Mie : 1 male, Kameyama-shi, Washiyama, 29– 30.ix.2006, N. Kawase, light pan trap (deposited in the Minakuchi Kodomo-no-kuni Nature Museum, Shiga, No. MITR 20090076 ) .

Distribution. Russia (South Siberia, continental part of Far East), Japan (Honshu). New to Japan.

Remarks. The male of this species is somewhat similar to that of Hydroptila oguranis Kobayashi 1974 , distributed in Japan, in having large dorsal plate and expanded apical parts of inferior appendages, but distinctly distinguishable from the latter by the long dorsal process (d.pr.) of segment IX.

Male specimens in Japan ( Figs 2 A–2D) differ slightly from those in Siberia ( Botosaneanu, 1993) in having a pair of membranous lateral processes (l.p.) on the posteroventral margins of segment IX. However, we recognize this to be either minor intraspecific variation or, since the processes on the Japanese specimens are often small and difficult to see due to transparency, simply structures omitted from the original description. The females are described here for the first time. The adults of this species were collected near fast-flowing rivers with stony substrates.

Japanese name. Senaga-hime-tobikera (newly given here).

Figures

FIGURE 2. Male and female of Hydroptila dorsoprocessuata Botosaneanu 1993. 2A–2D, male genitalia: 2A, left lateral; 2B, dorsal; 2C, ventral; 2D, phallic apparatus, left lateral. 2E–2H, female: 2E, abdominal segments VIII–X, left lateral; 2F, same, dorsal; 2G, same, ventral; 2H, vaginal apparatus, ventral. Abbreviations: VII–X = abdominal segments VII–X; ae. = aedeagus; d.pl. = dorsal plate; d.pr. = dorsal process; i.a. = inferior appendage (paired); l.p. = lateral process (paired); s.pl. = subgenital plate; sub.pr. = subapical process. Scale bars for 2A, 2D, and 2E = 0.1 mm.