Diognetus bagmaticus, Yasunaga & Schwartz & Chérot, 2023

Yasunaga, Tomohide, Schwartz, Michael D. & Chérot, Frédéric, 2023, Revision of the plant bug genus Diognetus, with descriptions of thirteen new species from the Oriental and Eastern Palearctic Regions (Hemiptera: Heteroptera: Miridae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 63 (1), pp. 1-55 : 5-12

Diognetus bagmaticus sp. nov.

( Figs 1G , 2A− C , 7A− C , 8A− D , 9A− B , 10A− D , 25A− P )

Type material. HOLOTYPE: J, NEPAL: BAGMATI ZONE: Kathmandu, Tripureshwor , 27.693555, 85.316545, UV lighting, 29 Oct 2006, T.Yasunaga ( AMNH _ PBI 00380744 ) ( NMTU) . PARATYPES: NEPAL: Kathmandu,same data as for holotype, 1 J 1 ♀ ( TYCN); Kathmandu, Gongabu-Samakhusi, 27.731066, 85.313088, UV lighting, 31 Jun2005, T.Yasunaga,1J ( TYCN); Kathmandu District,Nagarjun,27.7483,85.2519, 1,700 m (5,577 ft),flowers of Quercus semecarpifolia , 16 May 2005, T. Yasunaga, 1 J ( AMNH _ PBI 00419516) ( CNC), 1 J without USIs ( TYCN); Kathmandu District, Patibhanjyang, pastures, 27.84678, 85.45931, 1,829 m (6,000 ft), 20 Jun 1967, Can. Nepal Exped.,6JJ 7♀♀ ( CNC)(00419583–00419595);Lalitpur District, Godawari [Godavari], 27.59339, 85.39727, 1,829 m (6,000 ft), 14–23 Jul 1967, Can. Nepal Exped., 3JJ 16 ♀♀ ( CNC) (00419596–00419611); Laritpur,Godawari,Taukhel, 27.5999, 85.3555,flowers of Schima wallichii , 16 Jun 2006, R.K.Duwal,4JJ 1♀ ( AMNH, TYCN). RASUWA: Langtang Himal National Park, Dhunche,28.112073,85.297022, 1,950 m, at FL light of lodge balcony, 8–9 Jun 2006, T.Yasunaga, 1 ♀ ( TYCN).

Description. Body elongate ovoid, relatively large in size, 5.1–5.8 mm ( Figs 2A− C , 7A ). COLORATION: Dorsum varying from reddish-brown ( Figs 2B , 7A ) to chocolate brown ( Fig. 2A ), usually with mottled pattern ( Figs 2A− C ). Antennae pale reddish-brown; apex of segment II, segment III (except for pale extreme base) and segment IV dark brown. Labium pale brown, partly tinged with red. Pronotum reddish-brown, with calli and posterior half sometimes darkened ( Fig. 2A ) and posterior margin narrowly pale; pleura broadly fuscous; scent efferent system creamy yellow. Hemelytron reddish-brown, usually speckled with dark maculae; apices of exocorium (embolium) and cuneus narrowly pale; membrane smoky brown, with yellowish veins. Coxae and legs yellowish brown; mesofemur with two faint dark rings subapically; apical 1/3 of metafemur dark brown, with two pale rings subapically. Ventral surface of abdomen pale brown (somewhat greenish when alive); with more or less darkened lateral margins ( Figs 7B− C ). SURFACE AND VESTITURE: As in generic diagnosis; dorsal surface weakly shining; vestiture on thoracic pleura relatively sparse; hemelytron rather matte. STRUCTURE: Vertex narrow, with a basal transverse carina, weakly arched ( Figs 25B− C ). Antennal segment I about as thick as pronotal collar, longer than segment IV. Labium slightly exceeding apex of mesocoxa but not reaching apex of metacoxa ( Fig. 25D ). Scutellum rather flat, shallowly and sparsely punctate, with transverse wrinkles. Metathoracic scent efferent system as in Fig. 25E . Metatarsomere I short, about half as long as III; pretarsal structure as in Figs 28H− I ; parempodia rather long. MALE GENITALIA ( Figs 8A− D , 25F, J ): Left paramere with squared, developed sensory lobe and rather broad hypophysis that is hooked at apex ( Figs 8B , 25F ). Vesica with short, branched MS and smooth LS, lacking noticeable TP ( Figs 8D , 25J ). FEMALE GENITALIA (9A− B, 10A− D, 25K− O): Sclerotized ring with thickened anterior rim ( Figs 11B , 28L ); sclerotized ring with thickened anterior margin ( Figs 10A− B ); posterior wall ( Figs 9A , 10C , 25M− O ) with narrow dorsal structure and moderate-sized interramal lobe.

Measurements. See Table 1.

Differential diagnosis. Recognized by its relatively elongate, large body and shape of the male and female genitalic structures described above. Most similar in overall appearance to D. dhampus sp. nov., which was also found in Nepal and sympatric in some areas; distinguished by shorter antennal segment IV that is (♀) as long as / (J) slightly shorter than segment I, sensory lobe of left paramere more strongly produced, somewhat squared; apex (hypophysis) of right paramere flattened; and vesica with shorter, branched MS, lacking TP.

Etymology. Named for the type locality, Bagmati Zone in Nepal; latinized as an adjective.

Biology. Many of available individuals were collected by UV lighting method. Like as D. cheimon sp. nov., this species may utilize garden plants or landscaping trees as breeding hosts, since some specimens were collected at downtown area of Kathmandu. Several specimens were yielded by sweeping inflorescence of Quercus semecarpifolia Sm. (Fagaceae) ( Fig. 1G ) and Schima wallichii (DC.) Korth. (Theaceae) ( Fig. 1H ). Collection records suggest D. bagmaticus has a bivoltine life cycle; the adults were found in June and October.

Distribution. Nepal (Bagmati Zone, Rasuwa District).

Figures

Fig. 1. Habitats and host plants, Japan (A−F), Nepal (G−H) and Taiwan (I) for Diognetus cheimon sp. nov. (A−F), D. laureus sp. nov. (A−F), D. vernus sp. nov. (A−F), D. bagmaticus sp. nov. (G), D. puspae sp. nov. (H) and D. styrax sp. nov. (I). A–C − Eurya emarginata at preserved wetland (A), house entrance (B) and seaside park (C) in Nagasaki; D − Machilus thunbergii at Satoyama zone in Nagasaki City; E−F − Castanopsis sieboldii at coastal zones in Nagasaki City; G − Quercus semecaprifolia, inflorescence, at Nagarjun, Kathmandu; H − flowers of Schima wallichii at Godawari Valley, Lalitpur; I − Styrax formosanus, flowers, in Nantou.

Fig. 2. Habitus images for Diognetus species from Nepal.A–C – D. bagmaticus sp. nov.; D – a female identical to D. dhamphus sp. nov. (from Langtang Himal National Park, Rasuwa, NMTU); E – D. duwalorum sp. nov., holotypeJ; F–G, D. puspae sp. nov., sucking on banana fruit; H – a female identical to D. intonsus Distant, 1904 (from Langtang Himal National Park).

Fig. 7. Habitus images of Diognetus spp.A−C − D. bagmaticus sp. nov.,J (A−B) and♀ (C); D – undeterminedJ specimen from Queensland,Australia; E−F − D. dhampus sp. nov.,J; G−H − D. duwalorum sp. nov., holotype J; I − D. giganteus sp. nov., holotype ♀; J−K − D. gotohi sp. nov., holotype J; L−N − D. flavigenis (Horváth, 1905), J (M − head in frontal view). Scale bar 2 mm.

Fig. 8. Male genitalia of Diognetus bagmaticus sp. nov. (A−D), D.cheimon sp. nov.(E−G), D. dhampus sp. nov. (H−J) and D. duwalorum sp. nov.(K−M). A−B, E − apex of pygophore with parameres; C, H, L − right paramere; I, K − left paramere; D, F−G, J, M − vesica (endosoma). Scale bars 0.2 mm.

Fig. 9. Female genitalia of Diognetus bagmaticus sp. nov. (A−B) and D. intonsus Distant, 1904 (C−D). A, C − posterior wall; B, D − genital chamber. Scale bars 0.1 mm.

Fig. 10. Female genitalia of Diognetus bagmaticus sp. nov. (A−D), D. cheimon sp. nov. (E−G) and D. laureus sp. nov. (H−K). A, E − genital chamber; B, I − sclerotized ring; C, F, J − posterior wall; D, G, K − ovipositor (gonapophysis I). Scale bars 0.1 mm.

Fig. 25. Scanning electron micrographs for Diognetus bagmaticus sp. nov. from Nepal, J (A−J) and ♀ (K−O). A−B − dorsal habitus; C − head and anterior pronotum, left lateral view; D − anterior body, left lateral view; E − pleura and scent efferent system, left lateral view; F − pygophore, left lateral view; G − metatarsus; H−I − pretarsal structure of metaleg; J − apex of pygophore with exposed vesica and left paramere; K − genital chamber, dorsal view; L − sclerotized ring; M − posterior wall; N − dorsal structure; O − interramal lobe.

Fig. 28. Scanning electron micrographs for Diognetus flavigenis (Horváth, 1905) from Honshu, Japan, J (A, C−H) and ♀ (B, K−P). A – left lateral habitus; B − dorsal habitus; C − scutellum and adjacent structures; D − head and pronotum, anterior view; E − pleura and scent efferent system, left lateral view; F − metatarsus; G−H − pretarsal structure of metaleg; I − left paramere; J − right paramere; K − posterior wall; L − dorsal structure; M − dorsal structure and interramal lobe; N − interramal lobe; O − sclerotized ring; P − apex of ovipositor (gonapophysis I).

Fig. 11. Male (A–E) and female (F–I) genitalia of Diognetus flavigenis (Horváth, 1905).A − right paramere; B−C − left paramere; D−E − vesica (endosoma); F − ovipositor (gonapophysis I); G−H − genital chamber; I − posterior wall. Scale bars 0.1 mm.