Hypseloecus tamaderai, Yasunaga & Duwal, 2025

Yasunaga, Tomohide & Duwal, Ram Keshari, 2025, Three new species of the plant bug tribe Pilophorini from Japan (Hemiptera: Heteroptera: Miridae: Phylinae), Zootaxa 5632 (3), pp. 531-546 : 538-543

Hypseloecus tamaderai sp. nov.

Figs. 1 A−D, 2C−E, 3E–H, 4, 6H−P, 7, 9

Material examined. Holotype (♂), JAPAN: Honshu, Kanagawa Prefecture, Odawara City, Shiroyama , 35°15’02”N 139°09’14”E, on Taxillus yadoriki , 4 Nov 2023, Y. Tamadera ( NWHS) ( AMNH _ PBI 00378810 ) . Paratypes: JAPAN: Honshu , same data as for holotype, 3♂ 2♀ ( NWHS) ; Honshu, Wakayama Pref., Minabe Township, Higashi- Konogawa , 33°52’N 135°23’E, on Taxillus yadoriki , 7 Oct 2023, Y. Tamadera, 2♂ 2♀ ( NWHS) ; Honshu, Mie Pref., Kumano City, Kiwa Township , Kobune , 33°51’N 135°52’E, on Taxillus yadoriki , 4 Nov 2023, H. Fukutomi, 1♂ 2♀ ( NWHS) ; Kyushu, Miyazaki Pref., Kunitomi Township, Hodedake Park , 32°02’24”N 131°15’12”E, on Taxillus yadoriki , 30 Nov 2023, T. Saeki, 2♂ 1♀ ( NWHS) ; Miyazaki Pref., Miyazaki City, Shimokitakata, Heiwadai Park , 31°56’58”N 131°24’59”E, on Taxillus yadoriki , 27 Sep 2023, H. Fukutomi, 1♂ ( NWHS) ; same locality and plant, 27 Sep 2024, R. Ito, 2♀ ( NWHS) ; Kagoshima Pref., Tanegashima Island, Minamitane Township, Hirayama , 30°26’N 130°57’E, on Taxillus yadoriki , 11 Oct 2023, T. Saeki, 1♂ 2♀ ( TYCN) ; same data, except for date 15 Apr 2024, 2♂ ( TYCN) and 20 Apr 2024, 5♂ 2♀ ( CNC, TYCN) ; Kagoshima Pref., Yakushima Island, Miyanourarindo , 30°24’N 130°34’E, on Taxillus yadoriki , 25 Sep 2023, Y. Tamadera, 10♂ 12♀ ( AMNH, NWHS) ; Yakushima Island, Miyanoura, Ushidoko-Moisho , 30°24’35”N 130°33’53”E, on Taxillus yadoriki , 20 Apr 2024, T. Saeki, 1♂ ( TYCN) ; Ryukyus, Kagoshima Pref., Amami-Oshima Island, Amami City , Tatsugo Township , near Nagakumotoge , 28°26’N 129°35’E, on Taxillus yadoriki , 25 Sep 2023, H. Fukutomi, 3♂ 2♀ ( TYCN) ; Ryukyus, Okinawa Pref., Okinawa Island, Kunigami Village , Benoki , 26°46’20”N 128°15’43”E, on Taxillus yadoriki , 28 Apr 2024, T. Saeki, 1♀ ( NWHS) ; Okinawa Pref., Iriomote Island , 24°22’N 123°49’E, on Taxillus nigrans , 1 Dec 2023, H. Fukutomi, 7♂ 3♀ ( CNC, TYCN) .

Diagnosis. Distinguished from other East Asian congeners by its rounded, tortoise-shaped body ( Fig. 1A, C ); dark reddish brown or maroon basic coloration; long labium exceeding apex of metacoxa; irregular sanguineous maculae on metafemur; and clear reddish brown annulations on each tibia. The present new species is a close relative of H. fukutomii sp. nov., from which H. tamaderai sp. nov. is distinct in having the characters suggested in the above diagnosis and key to species. Externally, H. tamaderai sp. nov. is like H. castaneus Yasunaga, Yamada & Artchawakom, 2015 ( Fig. 1E–F ) and H. katrinae Yasunaga, Yamada & Artchawakom, 2015 from central Thailand; however, the genitalic structures of these Thai congeners are evidently different from those of H. tamaderai (cf. Yasunaga et al. 2015).

Description. Body generally maroon to dark reddish brown; dorsum relatively matte, with densely distributed, silvery, lanceolate, scale-like setae and sparsely distributed, dark, simple, semierect setae ( Fig. 6J ). Head dark reddish brown, weakly shining, with densely distributed silvery scale-like setae ( Figs. 1B , 2C , but easily rubbed off as in Fig. 6H ). Antenna reddish brown; segment I dark brown; segment II yellowish brown, except for darkened apical 1/4 and extreme base, (in male) about as long as / (in female) shorter than basal width of pronotum; segment III and IV grayish brown, filiform, with whitish extreme base of segment III. Labium shiny reddish brown, reaching but not exceeding apex of metacoxa. Pronotum almost uniformly dark reddish brown, with fuscous anterior and posterior pleural glands ( Fig. 1C ); scutellum fuscous, usually with paler or reddish lateral and posterior margins; pleura reddish brown; metathoracic scent efferent system creamy yellow, with circular peritreme ( Fig. 6K ). Hemelytron weakly shining, strongly declivous at cuneal fracture; cuneus reddish brown, with pale anterior margin; membrane smoky brown, with pale veins and small, pale spot at middle. All coxae creamy yellow, sometimes partly with orange-red spots; all femora reddish brown, each speckled with pale maculae or spots; all tibiae pale brown, with clear, dark reddish brown annulations; each tarsus yellowish brown, except for darkened apical part; meta-tarsomere III about as long as II ( Fig. 6L ); pretarsal structure as in Fig. 6M ; pulvilli relatively large. Abdomen reddish brown or darker. Male genitalia ( Figs. 3 E−H, 7A–I): similar in overall appearance to those of H. fukutomii sp. nov. Left paramere with sub-lateral protuberance smaller ( Figs. 3E , 7B–C ); right paramere with blunt-tipped hypophysis ( Figs. 3F , 7E–F ); phallotheca with sharp branch ( Fig. 3G ); vesical median process relatively short, broad ( Fig. 3H , 7H–I ). Female genitalia ( Figs. 4 , 7J–O ): Genital chamber with a pair of ovoid sclerites at bases of lateral oviducts and ribbon-like sclerite along posteromedial margin ( Fig. 4B, F ); sclerotized rings thick-rimmed, stout, triangular ( Figs. 4B, F , 7J, M ); vestibular sclerite tumid ( Fig. 4C ); ovipositor (gonapophysis I) as in Fig. 4A, D, E ; posterior wall with wide, triangular interramal lobes and anteromesal spinulate process ( Fig. 7K–L, N–O ); interramal lobe with dense spinules on distal 2/3 ( Fig. 7L, O ).

Measurements. See Table 1.

Etymology. Named after Dr. Yutaka Tamadera, who collected and presented valuable specimens of this new species; a noun in the genitive case.

Biology. The breeding host of this new species was confirmed to be Taxillus yadoriki (Siebold ex Maxim.) Danser and T. nigrans (Hayata) Danser ( Loranthaceae ). The newly emerged adults of Hypseloecus tamaderai sp. nov. are mostly found from the inflorescence of these Loranthaceae mistletoes. Since several adult specimens of the mirid were collected in April, this new species is presumed to overwinter in the adult stage.

Figures

FIGURE 1. Habitus images of living individuals (and habitat: D) of Hypseloecus spp. A−C. H. tamaderai sp. nov., paratype ♀ (from Miyazaki Pref.). D. Host plant of H. tamaderai, Taxillus yadoriki. E. H. castaneus Yasunaga, Yamada & Artchawakom, ♂ (from Nakhon Ratchasima, Thailand). F. Same, ♀. G. H. takahashii Yasunaga, 2000, paratype ♀ (from Ishigaki Island, courtesy of M. Takai).

FIGURE 2. Dorsal (A, C, F, H, J–L) and ventral (others) habitus images of Japanese pilophorine species. A−B. Hypseloecus fukutomii sp. nov. (A, holotype ♂, B−C, paratype ♂, D−E, paratype ♀). C–E. H. tamaderai sp. nov., paratypes (C, E from Yakushima Is., D from Amami-Oshima Is.). F–G. H. nakagawai Yasunaga & Duwal, 2019, paratype ♂ (from Akita Pref., Japan). H–I. Pilophorus reoi sp. nov., holotype ♂. J. Same, paratype ♀. K. P. maeharai Yasunaga & Duwal, 2016 (paratype ♀ from Tochigi Pref., Japan). L. P. hyotan Yasunaga, Duwal & Nakatani, 2021 (paratype ♀ from Nagasaki Pref., Japan).

FIGURE 3. Male genitalia of Hypseloecus fukutomii sp. nov. (A–D) and H. tamaderai sp. nov. (E–H). A, E. Left paramere. B, F. Right paramere. C, G. Phallotheca. D, H. Vesica.

FIGURE 4. Female genitalia of Hypseloecus tamaderai sp. nov. (A–D from Wakayama Pref., Honshu and E–F from Iriomote Is., Ryukyus) A, E. Genital chamber and ovipositors (gonapophyses I). B, F. Genital chamber. C. Vestibular sclerite. D. Apical part of gonapophysis I.

FIGURE 6. Scanning electron micrographs for Hypseloecus fukutomii sp. nov., holotype ♂ (A–G) and H. tamaderai sp. nov. (H–P: H, J, M from Mie Pref., Japan, I, L from Iriomote Is. And K, N–P from Amami-Oshima Is). A, J. Left lateral habitus of anterior body. B, E, O. Thoracic pleura, left lateral view. C, K. Metathoracic scent efferent system. D, H, I. Frontal head. F, M. Pretarsal structure of metaleg. G, L. Metatarsus. Thoracic pleura, left lateral view. N. Anterior pleural gland. P. Posterior pleural gland.

FIGURE 7. Scanning electron micrographs for male (A–F) and female (G–O) genitalia of Hypseloecus tamaderai sp. nov. (A– B, F, H–L from Mie Pref., C–E, G from Amami-Oshima Is. and E–F, M–O from Iriomote Is.). A. Genital segment (pygophore), left lateral view. B–C. Left paramere. D. Genital segment, dorsal view. E–F. Right paramere. G–H. Vesica. I. Vesical median process. J, M. Genital chamber. K–L, N–O. Posterior wall.