Diplectrona kibuneana Tsuda 1940

Nozaki, Takao, 2021, The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands, Zootaxa 5082 (3), pp. 245-258 : 246-248

publication ID	https://doi.org/ 10.11646/zootaxa.5082.3.3
publication LSID	lsid:zoobank.org:pub:99F75ED7-13CE-402E-8621-8F8534C8C08E
DOI	https://doi.org/10.5281/zenodo.5789475
persistent identifier	https://treatment.plazi.org/id/854F87B5-FFFB-681E-FF0A-B941FE96ADF9
treatment provided by	Plazi
scientific name	Diplectrona kibuneana Tsuda 1940
status

Treatment

Diplectrona kibuneana Tsuda 1940 View in CoL

( Figs 1 View FIGURE 1 , 7 View FIGURE 7 )

Diplectrona kibuneana Tsuda 1940 View in CoL , 24−25, male; Inazu & Nishida 2011, 191, male, larva; Nozaki 2016, 75, 348, male; Tanaka 2016, 2, 5, male; Park et al. 2017, 5−6, male; Tanida 2018, 571, 577, larva.

Diplectrona sp. DB: Akagi 1956, 24−25, larva; Tsuda & Akagi 1962, 133−134, larva; Tanida 1985, 176−177, larva.

Hydropsyche difficultata Kobayashi 1984 View in CoL , 5−6, male. New synonym.

Diagnosis. The male of this species is similar to that of D. burha distributed in southeastern Asia and Japan in genitalic morphology, but is easily distinguishable from the latter by the pair of long lateral filament of the abdominal segment V, and the pair of large internal gland of the segment VIII: Each lateral filament is approximately 2 times as long as segment V in this species, but is about 1.3 times as long as the segment in D. burha ; and each internal gland is longer than the segment VII in this species, but is lacking in D. burha .

Adult ( Figs 1A–1L View FIGURE 1 ). Head and body ( Fig. 1A View FIGURE 1 ) mostly dark brown, antennae with dark stripes; forewings black, with sparse white spots, spots around pterostigma larger ( Fig. 1A View FIGURE 1 ), but indistinct for specimens preserved in alcohol. Head ( Fig. 1B View FIGURE 1 ) with small round frontal setal wart (f.s.w.) and pairs of anterior and posterior setal warts; each anterior setal wart (a.s.w.) semicircular, mesal margin slightly concave; each posterior setal wart (p.s.w.) large, oval. Venation as in Figure 1C View FIGURE 1 ; forewings each 6.0–8.5 mm long in male (n = 10), 6.8–10.5 mm in female (n = 10), with postcostal region (posterior of looped anal veins) half as long as wing and wider than any wing cells; hind wings each with Sc and R1 veins bowed at pterostigma. Pair of lateral filaments (l.f.) of abdominal segment V (V) long, each approximately 2 times as long as segment V in male ( Fig. 1D View FIGURE 1 ), 1.5 times in female. Segment V with small internal gland (i.g.) both in male and female. Segment VIII (VIII) with very large internal gland in male, apparently longer than segment VII (VII) ( Fig. 1D View FIGURE 1 ), lacking in female.

Male genitalia ( Figs 1E–1I View FIGURE 1 ). Segment IX (IX) triangular in lateral aspect ( Fig. 1E View FIGURE 1 ). Segment X (X) with pair of mesocaudal lobes (m.c.l.), separated apically in dorsal aspect ( Fig. 1F View FIGURE 1 ), each with round apex in dorsal and lateral aspects ( Figs 1E, 1F View FIGURE 1 ), with stout clavate setae; pair of lateral lobes (l.l.) projected outward in dorsal aspect ( Fig. 1F View FIGURE 1 ), appearing jagged posteriorly because of tiny marginal spines, with short stout setae ventrally, shape of posterior margin in lateral aspect variable ( Figs 1E, 1I View FIGURE 1 ); pair of preanal appendages (p.a.) large oval in lateral aspect ( Fig. 1E View FIGURE 1 ), weakly bulging, setose. Inferior appendages (i.a.) each with basal segment long, extending beyond apex of segment X, gradually thickened from base to apex; distal segment about 1/3 as long as basal segment, tapering to apex, curved mesad ( Fig. 1F View FIGURE 1 ). Phallic apparatus thick basally, narrow in middle ( Fig. 1G View FIGURE 1 ); apex weakly bulging laterally in dorsal aspect ( Fig. 1H View FIGURE 1 ), with two pairs of endothecal processes (e.p.) dorsally, each process ovate, dorsal pair larger than ventral pair.

Female genitalia ( Figs 1J–1L View FIGURE 1 ). Sternum VIII cleft from base, forming pair of lateral lobes (l.l.) widely separated from each other posteriorly in ventral aspect ( Fig. 1L View FIGURE 1 ). Segment IX (IX) triangular in dorsal aspect ( Fig. 1K View FIGURE 1 ), rhomboid in lateral aspect ( Fig. 1J View FIGURE 1 ); with pair of long external sclerotized ribs (s.r.) ventrolaterally, weakly ridged ( Figs 1J, 1L View FIGURE 1 ). Vulval scale (v.s.) tongue-like in ventral aspect ( Fig. 1L View FIGURE 1 ), reinforced by sclerotized ribs basolaterally; apex membranous with small median bulge. Segment X (X) rhomboid in lateral aspect ( Fig. 1J View FIGURE 1 ), anteroventral corner slightly protruding anteriorly.

Immature stage. Diplectrona sp. DB described by Akagi (1956) is the larval stage of this species ( Kagaya et al. 1998; Inazu & Nishida 2011).

Specimens examined. Holotype male, paratype male of Hydropsyche difficultata Kobayashi 1984 (in alcohol): Konomazawa, Aone, Tsukui-machi , Kanagawa, 13.vii.1983, M. Kobayashi ( KPM-NK). Hokkaido: 1 female, Akanko-Takiguchi , Akan-cho , Kushiro-shi , 1.vii.1991, Y. Hirama; 4 males, 2 females, Ken’ichi River , Yakumocho , 26.vi.–20.vii.1995, Y. Ito & T. Ito ( TI). Honshu , Iwate, 1 female, Omori, Koromogawa-ku , Oshu-shi , 19– 20.vi.2017, T. Ito. Akita: 1 male, Otaki-yama , Akita-shi , 6.vii.2004, M. Tanaka ( MT); 1 female, Kasukose , Sannai , Yokote-shi , 30.viii.2011, M. Tanaka. Fukushima: 5 males, 2 females, Shio-zawa , Kanozu , Tadami-machi , alt. 430 m, 2–3.viii.2014, S. Inaba. Gunma: 1 male, Funako, Kanna-machi, 28.vii.1998, T. Hattori ( SPMN-IS). Ibaraki: 1 male, Uwaso, Ishioka-shi, 4.vi.2011, N. Katsuma. Tokyo: 1 male, Una-zawa, Okutama-machi, 10.vii.1991, T. Nozaki; 4 males, 1 female, Mitsu-sawa, Hinode-machi, 9.vii.1991, T. Nozaki & T. Kagaya; 5 males, Takimoto-sawa, Oguno, Hinode-machi, alt. 430 m, 21.vii.2010, T. Nozaki. Kanagawa: 2 males, Sawai-gawa, Fujino, Midori-ku, Sagamihara-shi, 11.vii.1984, T. Nozaki; 2 males, 2 females, Sakai-gawa, Shiroyama-cho, Sagamihara-shi, larvae collected on 7.vi.1984, adults emerged on 9.vii–12.viii.1984, T. Nozaki; 7 males, Jindai-sawa, Yamakita-machi, 5.vii.1984, T. Nozaki. Niigata: Higashimata-gawa, Oishi, Sekikawa-mura, 31.viii–1.ix.2014, S. Inaba. Toyama: 1 female, Kotani-gawa, Nanto-shi, alt. 450 m, 30.vii.1995, T. Hattori ( SPMN-IS). Yamanashi: 1 male, Akasawa, Hayakawa-cho, 3.viii.2008, T. Nozaki. Nagano: 1 male, Shira-kawa, Mitake, Kiso-machi, alt. 1060 m, 4.viii.1998, T. Nozaki; 1 male, Oonagare-sawa, Tohyama-gawai, Iida-shi, 8.viii.2008, T. Torii ( TT). Gifu: 1 male, Tsukechikyo, Nakatsugawa-shi, 22.viii.2008, T. Torii ( TT); 1 female, Ten-no-taki, Mikawa, Shirakawa-cho, 12.vi.2010, T. Nozaki. Shizuoka: 1 male, 1 female, Jizodo-gawa, Izu-shi, 2.vi.2009, T. Hattori ( SPMN-IS); 3 males, same locality, 16.ix.2009 ( SPMN-IS); 1 male, 1 female, Kurobe-sawa, Hirano, Aoi-ku, Shizuoka-shi, 20.viii.2009, T. Hattori ( SPMN-IS); 1 male, 1 female, Hirano, Aoi-ku, Shizuoka-shi, 25.v.1995, T. Hattori ( SPMN-IS). Mie: 1 male, Yunoyama, Komono-cho, 30.v.1997, H. Morita; 2 males, Minamiise-cho, 2.x.2008, H. Morita ( NK); 3 males, Kakiuchi, Hakusan-cho, Tsu-shi, 31.v.2009, H. Morita ( NK); 1 male, Hirakura, Misugi-cho, Tsu-shi, 14.viii.2011, H. Morita ( NK); 3 males, Kammuri-yama, Mizusawa-cho, Yokkaichi-shi, 6–16.iv.2009, H. Morita ( NK); 6 males, Kikaji, Iitaka-cho, Matsusaka-shi, 4.viii.2019, H. Morita ( NK). Shiga: 2 males, 2 females, Yuzurio, Eigenji-cho, Higashi-omi-shi, alt. 380 m, 6.ix.2013, T. Ito. Hyogo: 3 males, Omen-no-taki, Shinonsen-cho, 12.viii.1989, C. Kugo. Hiroshima: 1 male, Ohta-gawa, Doi, Akiota-cho, 26.vii.2003, S. Nakamura; 1 male, 1 femal, Hosomi-dani, Yoshiwa, Hatsukaichi-shi, alt. 820 m, 19.vii–13.ix.2005, I. Mori. Shikoku, Ehime: 1 male, Ono-ga-hara, Seiyoshi, 7.viii.2018, E. Yamamoto; 2 males, 3 females, Izugatani-yama, Nishidani, Kumakogen-cho, 1–10.viii.2018, E. Yamamoto; 7 males, 6 females, Honomata, Odamiyama, Nakagawa, Uchiko-cho, 11.ix.2018, E. Yamamoto; 10 males, 2 females, Namakusa-dani, Odamiyama, Nakagawa, Uchiko-cho, 16.vii.2000, E. Yamamoto; 1 male, 1 female, same locality, 11–20.vii.2020, E. Yamamoto. Kochi: 1 male, Yosakoi-toge, Teragawa, Ino-cho, 3.viii.2000, I. Yamashita; 1 male, Kuwaze, Ino-cho, alt. 618 m, 2.vii.2003, K. Nio; 2 males, Befu-kyo, Monobe-cho, Kami-shi, 18.ix.2003, K. Nio; 1 male, Tengu-ike, Tsuno-cho, 13.viii.2005, M. Takai; 1 male, 1 female, Kuishi-yama, Kochishi, 8.vii.2005, M. Takai; 1 male, Kitao, Hane, Muroto-shi, 3.vi.2006, M. Takai; 2 males, Kanaezaki, Tosashimizushi, 30.ix.2006, M. Takai; 2 males, 2 females, near Ashizuri-misaki, Tosashimizu-shi, 21.v.1999, A. Ohkawa & T. Ito. Kyushu, Fukuoka: 1 male, Mt. Hiko , Soeda-machi, alt. 650 m, 10.ix.1996, T. Nozaki. Nagasaki: 4 males, 3 females, Todoroki-keikoku, Takaki-cho, Isahaya-shi, 18.ix.2000, T. Nozaki. Kumamoto: 2 males, Kakizako, Izumi-machi, Yatsushiro-shi, 24.v.1998, T. Hattori ( SPMN-IS). Miyazaki: 3 males, 2 females, Kawanaka, Aya-cho, 9.xi.2012, Y. Hayashi. Kagoshima: 2 males, 2 females, Tashirofumoto, Kinko-cho, 28.vi.2014, S. Inaba.

Distribution. Japan: Hokkaido, Honshu, Shikoku, Kyushu, Tsushima, Yaku-shima. South Korea.

Japanese name. Kibune-miyama-shima-tobikera.

Remarks. Tsuda (1940) described this species based on two males collected from Kyoto, central Japan. Although I could not examine the type series materials of this species, which are likely lost, the male characteristics in the original description agree well with those of the male described above, especially the length of lateral filaments of abdominal segment V, and the shapes of mesocaudal lobes of segment X and inferior appendages.After comparative study of the type series males of Hydropsyche difficultata with specimens collected widely from Japanese main islands, I recognized that H. difficultata is the same species as D. kibuneana . Although the posterior margin of each lateral lobe of H. difficultata bears a ventral projection directed posterodorsad in lateral aspect ( Kobayashi 1984, fig. 12; Fig. 1I View FIGURE 1 ), the shape is variable in D. kibuneana even in the same locality.

In the collection of the late Mr. Kobayashi deposited in the Kanagawa Prefectural Museum of Natural History , the holotype and paratype males of H. difficultata were preserved together in the same vial with two handwritten labels reading “7262 ♂.” A male without abdomen and a cleared abdomen in the vial must have been used in the original description by Kobayashi (1984). I added a label “ HOLOTYPE labeled by T. Nozaki, 2021” into this vial and another male was moved into a different small vial with labels, “7262 ♂ ” and “ PARATYPE labeled by T. Nozaki, 2021.”