Hydroptila thuna Oláh, 1989

Ito, Tomiko, Ohkawa, Ayuko & Hattori, Toshio, 2011, The genus Hydroptila Dalman (Trichoptera, Hydroptilidae) in Japan, Zootaxa 2801, pp. 1-26 : 5

publication ID

https://doi.org/ 10.5281/zenodo.202293

DOI

https://doi.org/10.5281/zenodo.6190645

persistent identifier

https://treatment.plazi.org/id/9359FE43-7A7B-2C47-FF30-FEBCAB5BF96A

treatment provided by

Plazi (2016-04-10 05:32:53, last updated 2024-11-24 23:47:28)

scientific name

Hydroptila thuna Oláh, 1989
status

 

Hydroptila thuna Oláh, 1989 View in CoL

( Figs. 2 View FIGURES 1 – 2. 1 , 14 View FIGURE 14 A)

Hydroptila thuna Oláh, 1989 View in CoL , 281–282, fig. 26, male, Vietnam.

Hydroptila triangularis Wells & Dudgeon, 1990 , 168–169, figs. 14–16, male, female,

Hong Kong; synonymized by Wells & Malicky (1997).

Hydroptila apiculata Yang & Xue, 1992 View in CoL , 26–27, male, China; Arefina, 2004, 210–211, figs 6–14, male, female, Russia (Khabarovsk, Primorye); synonymized by Malicky & Chantaramongkol (2007).

Hydroptila molione Malicky, 2004b , 293–294, fig. 3, male, Nepal; synonymized by Malicky & Chantaramongkol (2007).

Hydroptila phenianica: Shimura, 2010 , 49, Japan (Yonaguni Island), misidentification.

Adult. Wings dark brown with several small lighter markings. Antennae brown to light brown with darker markings near half way and at apices.

Male. Lengths of forewing, hindwing and body 2.0– 2.4 mm, 1.6–1.9 mm and 2.1–2.5 mm, respectively (n=5). Antennae 29–30-segmented; length 1.2–1.5 mm (n=5). Ventral process of sternite VII small, apically subacute. Segment IX with large subtriangular apico-lateral apodemes. Dorsal plate semi-membranous, parallel sided for basal 3/4 and semi-circular with deep median slit in distal 1/ 4 in dorsal view. Subgenital plate shorter than dorsal plate, composed of sclerotized ventral plate and membranous dorsal lobe; ventral plate triangular in ventral view with sharply produced slender apical process and 2 fine setae at base of apical process. Phallic apparatus slender with long strap-like subapical process with short titillator. Inferior appendages almost parallel sided with apex subacute in lateral view, in ventral view narrowly triangular, directed latero-posteriad.

Female. Lengths of forewing, hindwing and body 2.4–2.9 mm, 2.0– 2.6 mm and 2.9–3.4 mm, respectively (n=5). Antennae 23-segmented; length 1.1 mm (n=2). Abdomen increasingly darker and more setose from segment I to segment VII. Sternite VI with small ventral process. Segment VIII strongly sclerotized, tergite and sternite fused laterally; tergite with middle and 2 lateral excisions on posterior margin, and 3 pairs of marginal setae; sternite with posterior margin broadly rounded; in ventral view internal triangular sclerite extended from anterior margin to segment VII. Bursa copulatrix thin, lozenge-shaped.

Specimens examined. Okinawa, Yaeyama Islands: 1 male, Yonaguni-jima, Tabaru-gawa, headwater, 11.IV.2008, N. Shimura; 4 males, 8 females, ibid., 3.III.2009, N. Shimura; 45 males, 19 females, ibid., 4.IV.2010, N. Shimura; 1 male, 1 female, Ishigaki-jima, Miyara-gawa, Kawahara-bashi, 12.IV.2005, TI, S; 1 male, Ishigakijima, Nagura-gawa, Toru-bashi, 12.III.2009, TI, L.

Remarks. This is one of the most widespread hydroptilid species in East Asia ( Malicky & Chantaramongkol 2007). In Japan, it is found only in the Yaeyama Islands, the most southwestern islands, near Taiwan. It can be distinguished from H. phenianica by the features given in remarks for that species.

Distribution. Japan (Yaeyama Islands), Russian Far East (continental parts), China, Taiwan, Hong Kong, Raos, Thailand, Vietnam, Nepal, Sumatra. New to Japan.

Habitat. Adults were collected from streams in mountain and lowland areas.

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

Arefina, T. I. (2004) A new species of the genus Stactobiella Martynov with reassignment of Stactobiella tshistjakovi (Arefina et Morse, 2002) and new records of micro-caddisflies (Trichoptera: Hydroptilidae) from the Russian Far East. Euroasian Entomological Journal, 3 (3), 209 - 211.

Malicky, H. (2004 b) Neue Kocherfliegen (Trichoptera) aus dem Bardia Nationalpark, Nepal. Denisia, 13, 291 - 300.

Malicky, H. & Chantaramongkol, P. (2007) Beitr age zur Kenntnis asiatischer Hydroptilidae (Trichoptera). Linzer biologische Beitrage, 39, 1009 - 1099.

Olah, J. (1989) Thirty-five new hydroptilid species from Vietnam (Trichoptera, Hydroptilidae). Acta Zoologica Hungarica, 35, 255 - 293.

Shimura, N. (2010) Collection record of Ephemeroptera, Plecoptera and Trichoptera from Yonaguni-Island, the westernmost part of Japan. Hyogo Freshwater Biology, 61 / 62, 45 - 54 [in Japanese].

Wells, A. & Dudgeon, D. (1990) Hydroptilidae (Insecta: Trichoptera) from Hong Kong. Aquatic Insects, 12, 161 - 175.

Wells, A. & Malicky, H. (1997) The micro-caddisflies of Sumatra and Java (Trichoptera: Hydroptilidae). Linzer biologische Beitrage, 29, 173 - 202.

Yang, L. & Xue, Y. (1992) Six new species of Hydroptilidae (Insecta: Trichoptera) from China. Entomotaxonomia, 14 (1), 26 - 34 [in Chinese with English description of the species].

Gallery Image

FIGURE 14. Distributions of 12 species of Hydroptila in Japan and adjacent areas. For clarity, nearby collection sites in Japan are grouped together as a single point and the sites are roughly plotted in adjacent, non-Japanese areas.

Gallery Image

FIGURES 1 – 2. 1, Hydroptila phenianica: A – C, male; A—abdominal segments VII – X, lateral; B—genitalia, dorsal; Csame, ventral; D – G, female; D—abdominal segment VIII, lateral; E—same, dorsal; F—abdominal segments VI – X, ventral; G—bursa copulatrix, ventral. 2, H. thuna: A – C, male; A—abdominal segments VII – X, lateral; B—genitalia, dorsal; C—same, ventral; D – F, female; D—abdominal segment VIII, lateral; E—same, dorsal; F— abdominal segments VII – X, ventral. Abbreviations: VI – X, abdominal segments VI – X; dpl – dorsal plate; dl spl – dorsal lobe of subgenital plate; ia—inferior appendage; pa—phallic apparatus; sub pr—subapical process; vp spl—ventral plate of subgenital plate.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Trichoptera

Family

Hydroptilidae

Genus

Hydroptila