taxonID	type	description	language	source
854F87B5FFFB681EFF0AB941FE96ADF9.taxon	description	(Figs 1, 7)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFB681EFF0AB941FE96ADF9.taxon	diagnosis	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 1 A – 1 L). Head and body (Fig. 1 A) mostly dark brown, antennae with dark stripes; forewings black, with sparse white spots, spots around pterostigma larger (Fig. 1 A), but indistinct for specimens preserved in alcohol. Head (Fig. 1 B) 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 1 C; 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 R 1 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. 1 D), 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. 1 D), lacking in female. Male genitalia (Figs 1 E – 1 I). Segment IX (IX) triangular in lateral aspect (Fig. 1 E). Segment X (X) with pair of mesocaudal lobes (m. c. l.), separated apically in dorsal aspect (Fig. 1 F), each with round apex in dorsal and lateral aspects (Figs 1 E, 1 F), with stout clavate setae; pair of lateral lobes (l. l.) projected outward in dorsal aspect (Fig. 1 F), appearing jagged posteriorly because of tiny marginal spines, with short stout setae ventrally, shape of posterior margin in lateral aspect variable (Figs 1 E, 1 I); pair of preanal appendages (p. a.) large oval in lateral aspect (Fig. 1 E), 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. 1 F). Phallic apparatus thick basally, narrow in middle (Fig. 1 G); apex weakly bulging laterally in dorsal aspect (Fig. 1 H), with two pairs of endothecal processes (e. p.) dorsally, each process ovate, dorsal pair larger than ventral pair. Female genitalia (Figs 1 J – 1 L). Sternum VIII cleft from base, forming pair of lateral lobes (l. l.) widely separated from each other posteriorly in ventral aspect (Fig. 1 L). Segment IX (IX) triangular in dorsal aspect (Fig. 1 K), rhomboid in lateral aspect (Fig. 1 J); with pair of long external sclerotized ribs (s. r.) ventrolaterally, weakly ridged (Figs 1 J, 1 L). Vulval scale (v. s.) tongue-like in ventral aspect (Fig. 1 L), reinforced by sclerotized ribs basolaterally; apex membranous with small median bulge. Segment X (X) rhomboid in lateral aspect (Fig. 1 J), 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.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFB681EFF0AB941FE96ADF9.taxon	distribution	Distribution. Japan: Hokkaido, Honshu, Shikoku, Kyushu, Tsushima, Yaku-shima. South Korea. Japanese name. Kibune-miyama-shima-tobikera.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFB681EFF0AB941FE96ADF9.taxon	discussion	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. 1 I), 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. ”	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFE6818FF0ABB90FC0EA858.taxon	description	(Figs 2, 7)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFE6818FF0ABB90FC0EA858.taxon	diagnosis	Diagnosis. The male of this species is similar to that of D. kibuneana in the genitalic morphology but is distinguishable from that of the latter by the characters given in the diagnosis for that species. Adult (Figs 2 A – 2 G). Only one male specimen available in this study. General appearance similar to D. kibuneana, but white markings more distinct (Fig. 2 A). On the head (Fig. 2 B), frontal setal wart (f. s. w.) small oval; each anterior setal wart (a. s. w.) divided into 2 warts, anterior one [= vertexal lateroantennal complex setal wart of Sun (2017)] small, long oval, posterior one [= vertexal lateral compact setal wart of Sun (2017)] irregularly triangular; each posterior setal wart (p. s. w.) large oval. Forewings each 7.0 mm long, venation similar to that of D. kibuneana (Fig. 1 C). Pair of lateral filaments (l. f.) of abdominal segment V (V) long, each about 1.3 times as long as segment V (Fig. 2 C). Internal gland of segment V small, internal gland of segment VIII (VIII) absent (Fig. 2 C). Male genitalia (Figs 2 D – 2 G). Segment IX (IX) triangular in lateral aspect (Fig. 2 D). Segment X (X) with pair of mesocaudal lobes (m. c. l.), each long oval in lateral and dorsal aspects (Figs 2 D, 2 E), with stout clavate setae; pair of lateral lobes (l. l) projecting outward in dorsal aspect (Fig. 2 E), with spine-like posterodorsal projection, ventral margin strongly sclerotized, with short setae; pair of preanal appendages large oval in lateral aspect, weakly bulging, setose. Inferior appendages (i. a.) each with basal segment long club-like, extending beyond apex of segment X (Fig. 2 D); distal segment about 1 / 3 as long as basal segment, tapering to apex, curved mesad (Fig. 2 E). Phallic apparatus narrow in middle in lateral aspect (Fig. 2 F); with two pairs of endothecal processes (e. p.) apicodorsally, each ovate (Fig. 2 G). Immature stage. Unknown. Specimens examined. Shikoku, Kochi: 1 male, Befu, Monobe-cho, Kami-shi, 27. vii. 2003, M. Takai.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFE6818FF0ABB90FC0EA858.taxon	distribution	Distribution. Japan (Shikoku, Ryukyu islands), Pakistan, India, Nepal, Thailand, Vietnam, Taiwan. Japanese name. Buruha-miyama-shima-tobikera.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFE6818FF0ABB90FC0EA858.taxon	discussion	Remarks. The single male specimen available in this study has many characteristics which agree with those of D. burha described or redescribed by Schmid (1961), Malicky (2002), and Ito & Nozaki (2018); for example, the length of the lateral filaments of abdominal segment V, the size of the internal glands of segment V, lack of internal glands of segment VIII, and the shape of the genitalia. The shape of the mesocaudal lobes and lateral lobes of the segment X are different from those of males collected from Ryukyu islands, southwestern Japan (Ito & Nozaki 2018), but similar to those illustrated in the original description (Schmid 1961, pl. 17, figs 7, 8). Schmid (1961) and Malicky (2002) reported variations of the male genitalia in this species.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFF681BFF0AB96DFDE8AAB9.taxon	description	(Figs 3, 7)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFF681BFF0AB96DFDE8AAB9.taxon	diagnosis	Diagnosis. Male genitalia of this species are similar to those of Diplectrona guangxiensis Sun 2017 described from China but are distinguished by the length of the lateral filaments of the abdominal segment V: Each lateral filament is about 1.7 times longer than the segment V in D. aiensis, but slightly shorter than the segment in D. guangxiensis. Furthermore, the pair of internal glands of the abdominal segment VIII of D. aiensis are larger than those of D. guangxiensis. Adult (Figs 3 A – 3 J). General appearance similar to D. kibuneana (Fig. 3 A). On head (Fig. 3 B), frontal setal wart (f. s. w.) small oval; each anterior setal wart (a. s. w.) divided into 3 warts, 2 anterior ones each small oval, posterior one triangular; each posterior setal wart (p. s. w.) large oval. Forewings each 7.0 – 9.5 mm long in male (n = 10), 9.3 – 11.5 mm in female (n = 10), venation similar to that of D. kibuneana (Fig. 1 C). Pair of lateral filaments (l. f.) of abdominal segment V (V) long, each about 1.7 times as long as segment V in male (Fig. 3 C), 1.4 times in female. Segment V with small internal gland (i. g.) in both male and female. Segment VIII (VIII) with large internal gland in male (Fig. 3 C), slightly shorter than segment VII (VII), lacking in female. Male genitalia (Figs 3 D – 3 G). Segment IX longitudinally short in lateral aspect (Fig. 3 D), anterior margins angled 50 ° in lateral aspect. Segment X (X) triangular in lateral aspect (Fig. 3 D), with pair of mesocaudal lobes (m. c. l.) V-shaped in dorsal aspect (Fig. 3 E); pair of lateral lobes (l. l) rectangular in dorsal aspect (Fig. 3 E), each with apex directed dorsad and with short setae ventrally (Fig. 3 D); preanal appendages indistinct, forming only large setose areas. Inferior appendages each with basal segment long club-like, extending beyond apex of segment X (Fig. 3 D); distal segment slightly shorter than 1 / 3 of basal segment, tapering to apex, weakly curved mesad (Fig. 3 E). Phallic apparatus thick basally and with apical 2 / 3 almost straight in lateral aspect (3 F), thick apex with two pairs of endothecal processes dorsally, each apex somewhat sharp (Fig. 3 F). Female genitalia (Figs 3 H – 3 J). Sternum VIII cleft from base, lateral lobes (l. l.) widely separated from each other posteriorly in ventral aspect (Fig. 3 J). Segment IX (IX) semicircular in dorsal aspect (Fig. 3 I), anterior margins gently convex anteriorly about 1 / 3 from base in lateral aspect (Fig. 3 H); with pair of shallow slits posterodorsally; pair of short external sclerotized ribs (s. r.) ventrally (Figs 3 H, 3 J). Vulval scale (v. s.) with pair of short protrusions basolaterally in ventral aspect (marked with arrow in Fig. 3 J), apical part broadly membranous. Segment X (X) rhomboid in lateral aspect (Fig. 3 H). Immature stage. Morphology and biology of this species will be reported in a future work. Specimens examined. Holotype: Male (in alcohol, M- 8232), Ai (200 m), Nita-gun, Shimane, 22. vii. 1985, M. Kobayashi (KPM-NK). Honshu, Akita: 2 males, Sashimaki, Tazawa-ko, Semboku-shi, 29. vi. 2012, M. Tanaka. Ibaraki: 3 males, Uwaso, Ishioka-shi, 7. vi. 2008, N. Katsuma; 1 female, same locality, 15. vii. 2008, N. Katsuma; 5 males, 4 females, same locality, 4. vi. 2011, N. Katsuma; 6 males, 5 female, same locality, 11. vi. 2011, N. Katsuma. Aichi: 2 males, Hashigoda, Kikko, Moriyama-ku, Nagoya-shi, 16. v. 2011, T. Nozaki. Mie: 1 male, Tabika, Komono-cho, alt. 85 m, 1 – 8. x. 2000, H. Morita; 4 males, 1 female, same locality, 6. v. 2006, H. Morita; 2 males, same locality, 31. v. 2011, H. Morita; 3 males, 4 females, Okubano, Iga-shi, 9 – 22. vi. 2012, H. Morita (NK). Shiga: 1 male, Shishitobi-bashi, Seta-gawa, Oishi-higashi, Otsu-shi, 2. ix. 2014, S. Kobayashi. Okayama: 1 male, Okutsu-kawanishi, Kagamino-cho, 26. vi. 2013, K. Nojima (KN). Kyushu, Saga: 1 male, Fuji-cho, Saga-shi, 6. v. 2011, T. Iwai et al. Distribution. Japan: Honshu, Kyushu. Japanese name. Ai-shima-tobikera.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	description	(Figs 4, 7)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	description	Diplectrona sp. (aiensis gr.): Kawase & Morita 2010, 42. Diplectrona sp. (aff. aiensis): Nojima 2017, 119. Diplectrona sp.: Nozaki 2016, 75, 348, photo (adult male)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	diagnosis	Diagnosis. The male of this species is similar to that of D. albofasciata known from Taiwan and the southernmost islands of Japan, and Diplectrona wangyipingi Sun 2017, described from China. However, the male is easily distinguishable from the latter two species by the shape of the phallotheca: the phallotheca bears a pair of prominent apicolateral lobes in this species, but it lacks such lobes in D. albofasciata and D. wangyipingi. Furthermore, the length of the internal gland is longer than segment VII in this species, but shorter than the segment in D. albofasciata and D. wangyipingi; and the length of the lateral filaments is approximately the same length as segment V in this species, but longer than the segment in D. wangyipingi. Adult (Figs 4 A – 4 M). Head and body (Figs 4 A, 4 B) mostly dark brown; antennae with dark stripes, but apical half paler. Forewings dark brown to black with white markings, but markings variable: on Shikoku usually with 3 large white markings (Fig. 4 A), but occasionally indistinct (4 B); on Honshu with sparse white spots similar to those on D. kibuneana (Fig. 1 A). On head, frontal setal wart (f. s. w.) small oval, each anterior setal wart (a. s. w.) divided into 2 warts (Fig. 4 C), anterior one long oval but often divided into 2 small warts (Fig. 4 D), posterior one triangular; each posterior setal wart (p. s. w.) large oval. Forewings each 5.0 – 7.2 mm long in male (n = 10), 5.5 – 8.2 mm in female (n = 10), venation similar to that of D. kibuneana (Fig. 1 C). Pair of lateral filaments (l. f.) of abdominal segment V (V) short, each approximately same length as segment V in both male and female (Fig. 4 E). Segment V with small internal gland (i. g.) in both male and female (Fig. 4 E). Segment VIII (VIII) with internal gland in male, very large, longer than segment VII (VII) (Fig. 4 E), lacking in female. Male genitalia (Figs 4 F – 4 J). Segment IX (IX) in lateral aspect (Fig. 4 F) narrow, anterior margins gently convex anterad, posterior margins sinuate in ventral half. Segment X (X) triangular in lateral aspect (Fig. 4 F); pair of mesocaudal lobes (m. c. l.) V-shaped in dorsal aspect (Fig. 4 G), laterally fused with respective lateral lobe; pair of lateral lobes (l. l.) protruding caudad posterodorsally, apically triangular and with short setae posteroventrally in lateral aspect (Fig. 4 F), truncate in dorsal aspect (Fig. 4 G); preanal appendages indistinct, only forming pair of large setose areas. Inferior appendages (i. a.) each with basal segment long club-like, apical 1 / 3 slightly thicker, extending beyond apex of segment X (X) (Fig. 4 F); distal segment about 1 / 3 as long as basal segment, tapering to apex, weakly curved mesad (Fig. 4 G). Phallic apparatus short and thick; bilobed apically in dorsal and ventral aspects (Figs 4 I, 4 J), each lateral lobe triangular in lateral aspect (Fig. 4 H), its apex directed dorsomesad (Fig. 4 H, 4 J); with two pairs of long endothecal processes (e. p.) apicodorsally, each process lanceolate, ventral processes narrower than dorsal processes (Figs 4 H). Female genitalia (4 K – 4 M). Sternum VIII cleft from base, each lateral lobe (l. l.) quarter-circle in ventral aspect (Fig. 4 M). Segment IX (IX) almost rhomboid in lateral aspect (Fig. 4 K), triangular posteriorly in dorsal aspect (Fig. 4 L), anterior margin slightly convex anteriorly about 1 / 3 from base in lateral aspect; with pair of external sclerotized ribs (s. r.) ventrolaterally (Fig. 4 M). Vulval scale (v. s.) tongue-like in ventral aspect (Fig. 4 M), membranous apically. Segment X (X) rhomboid in lateral aspect (Fig. 4 K). Immature stages. Diplectrona sp. DC described by Akagi (1956) is the larval stage of this species. The adult and larval association of this species was established by Kagaya et al. (1998).	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	materials_examined	Holotype. Male (in alcohol), Mt. Iwaguro, Teragawa, Ino-cho, Kochi, 33.744 ° N, 133.162 ° E, alt. ca. 1350 m, 17. vii. 2004, M. Takai (CBM-ZI 0180241). Paratypes. 24 males, 2 females, Namakusa-dani, Odamiyama, Nakagawa, Uchiko-cho, Ehime, 33.562 ° N, 132.916 ° E, alt. 1200 m, 8. vii. 2000, E. Yamamoto (CBM-ZI 0180244 – 0180269); 10 males, 5 females, same locality, 24. vii. 2000, E. Yamamoto (KPM-NK); 1 male, 1 female, Yosakoi-toge, Teragawa, Ino-cho, Kochi, 3. viii. 2001, I. Yamashita (CBM-ZI 0180242 – 0180243). Other specimens examined. Honshu, Tokyo: 2 males, Hirai-gawa, Hinode-machi, larvae collected on 20. vii. 1990, adults emerged on 10 – 15. viii. 1990, by T. Nozaki. Shizuoka: 1 female, Oyamada-gawa, Horikiri, Izushi, alt. 350 m, 14. v. 1995, T. Hattori (SPMN-IS); 1 female, Yokosawa, Aoi-ku, Shizuoka-shi, alt. 550 m, 8. vi. 2001, T. Hattori (SPMN-IS); 1 male, same locality, 18. v. 2005, T. Hattori (SPMN-IS); 1 male, Utoge-no-taki, Kurata, Fujieda-shi, G. Yoshinari (TT). Gifu: Ten-no-taki, Mikawa, Shirakawa-cho, 12. vi. 2010, T. Nozaki. Shiga: 11 males, 4 females, Yuzurio, Eigenji, Higashi-Omi-shi, 31. v – 26. vi. 2009, N. Kawase (NK); 11 males, 40 females, same locality, 26. vi – 29. vii. 2009, N. Kawase (MITR- 20090429 & 20090433). Okayama: 1 male, 1 female, Ogaya, Nishiawakurason, 15. vii. 2017, K. Nojima (KN). Shikoku, Ehime: 1 male, Honomata, Odamiyama, Nakagawa, Uchiko-cho, 21 – 30. vi. 2000, E. Yamamoto (TN); 1 male, 1 female, Ishizuchi Sky-line, Kumakogen-cho, 3. viii. 2006, M. Takai. Kochi: 1 female, Teragawa, Ino-cho, 16. vii. 2000, I. Yamashita; 1 male, Befu-kyo, Monobe, Kami-shi, 16. v. 2003, M. Takai; 1 female, Shiragagoe, Monobe-cho, Kami-shi, 3. vii. 2004, M. Takai; 1 male, 1 female, Mt. Shiraga, Monobe, Kami-shi, Kochi, 25. vii. 2004, M. Takai.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	etymology	Etymology. This species is dedicated to Mr. Mikio Takai, who provided me valuable specimens and excellent photographs, including specimens and photographs of this species.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	distribution	Distribution. Japan: Honshu, Shikoku. Japanese name. Takai-miyama-shima-tobikera.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFFC6814FF0ABC23FE6BAB25.taxon	discussion	Remarks. The markings of the forewings in this species are variable, and Malicky (2002) also reported similar variations in D. albofasciata.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFF36814FF0ABAF9FE58AEFF.taxon	description	(Fig. 5)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFF36814FF0ABAF9FE58AEFF.taxon	discussion	Remarks. Banks (1906) described Arctopsyche japonica based on specimens collected from Hikosan, Buzen (now Fukuoka, Kyushu), and a figure of distinct yellow markings of the left forewing was provided. He also recorded this species from Gifu, central Honshu, but precise data were not provided (Banks 1906). Ulmer (1907) transferred this species to the genus Diplectrona based on examination of males collected from Gifu, which have similar markings to the illustration by Banks (1906). However, according to photographs of a syntype male collected from Hikosan, and deposited in the Museum of Comparative Zoology, Harvard University (Figs 5 A – 5 D: photographed by C. W. Farnum), the male bears a club-like process on each anterolateral corner of abdominal sternum V (s. V) (marked with an arrow in Fig. 5 B). Furthermore, in male genitalia (Fig. 5 C), each inferior appendage (i. a.) is onesegmented, and the large phallic apparatus (ph.) bears long spine-like processes. Males collected from the same area as the syntype male was collected have the same genitalic morphology (Fig. 5 E). This species therefore belongs to the genus Homoplectra, and not to Diplectrona. After the publication by Banks (1906), many authors recorded D. japonica based on the characteristic markings of the forewings; however, Kawase & Morita (2014) noted that multiple species have this character. This taxonomic problem warrants future work.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFF36816FF0ABE16FBEBAAB9.taxon	description	(Fig. 6)	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
854F87B5FFF36816FF0ABE16FBEBAAB9.taxon	discussion	Remarks. Ulmer (1907) described this species as a member of the genus Diplectrona based on a female specimen collected from an unknown locality in Gifu, central Honshu, and provided only a general description without illustrations. In 2021, I obtained photographs of the holotype of this species deposited in the Royal Belgian Institute of Natural Sciences, Brussels (Figs 6 A – 6 D: photographed by J. Lalanne). Although the specimen lacks her head, her abdomen retains the following characteristics: Abdominal sternum V (s. V) bears a club-like process near the anterolateral margin (marked with an arrow in Fig. 6 B), the vulvar scale (v. s.) bears a pair of plate-like lobes basally (marked with a black arrow in Fig. 6 C), and a large pocket-like concavity between segment IX and vulval scale (marked with a white arrow in Fig. 6 C). Through the course of my study, I obtained females collected in Gifu, which have these characters (the latter two characters marked with arrows in Fig. 6 E). Their morphology, such as stout antennae, shape of wings, wing venation, etc., suggests that this species does not belong to the genus Diplectrona, but to Homoplectra. Although the markings of the forewings of the holotype female are indistinct (Fig. 6 A), the two females examined in this study have forewings with distinct yellow markings similar to those of H. japonica. Furthermore, 45 females collected from Shiga, an adjacent district of Gifu, have the same genitalic morphology as the holotype and 36 of these females bear the distinct markings, but 9 of them lack the markings. Redescription of this species in detail, including the variation of wing coloration, warrants future study.	en	Nozaki, Takao (2021): The genus Diplectrona Westwood (Trichoptera: Hydropsychidae) in the Japanese main islands. Zootaxa 5082 (3): 245-258, DOI: https://doi.org/10.11646/zootaxa.5082.3.3
