Diognetus intonsus Distant, 1904

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 : 26-27

Diognetus intonsus Distant, 1904

( Figs 2G , 9C− D , 14C− F , 15F− J , 16D− E , 30A− I )

Diognetus intonsus Distant, 1904b: 432 (as new species).

Diognetus intonsus: SCHUH (1995) : 760 (catalog), SCHUH (2002 –2013) (online catalog); CH ḖROT et al. (2017): 93–94 (diagnosis, DV, MG, FG); SAHA et al. (2020): 279 (faunal list).

Diophantus literatus Distant, 1909: 510–511 (as new species).

Diophantus literatus: SCHUH (1995) : 760 (catalog), SCHUH (2002 –2013) (online catalog); CH ḖROT et al. (2017): 94 (synonymy).

Diplotrichiella rufescens Poppius, 1915 a: 66 (as new species). New junior subjective synonym.

Diplotrichiella rufescens: SCHUH (1995) : 761 (catalog), SCHUH (2002 – 2013) (online catalog).

Type material examined. Diognetus intonsus : LECTOTYPE: ♀ ( BMNH), SRI LANKA: Ceylon , Maskelyia, Green (no further data, BMNH).

Diognetus literatus : LECTOTYPE: ♀ ( BMNH), SRI LANKA: Ceylon , Ohiya, Green (no further data, damaged specimen, BMNH).

Diplotrichiella rufescens : HOLOTYPE: ♀ ( MZHF), INDIA: TAMIL NADU: Trichinopoly, 1898, Coll. Nouhalier (vertically compressed and partly damaged condition).

Additional material examined. INDIA: TAMIL NADU: Madras,Anamalai Hills, Cinchona, 10.28228, 76.97999, 1,067 m (3,500 ft), Apr 1959, P. S. Nathan, 1♀ ( AMNH _ PBI 00419635) ( CNC); same locality, May 1965; P. S. Nathan, 3 JJ 2 ♀♀ (00419670–00419674) ( CNC). THAILAND: CHIANG MAI: Doi Pui, 18.826460, 98.892088, UV lighting, 23–24 Oct 1981, S. Sakurai, 3 ♀♀ ( DOAT, TYCN).

Redescription. Body oval, moderate in size, 4.8–5.3 mm. COLORATION: Dorsum castaneous, usually tinged with red ( Figs 14C− D ), usually with mottled pattern ( Fig. 14C ). Antennae yellowish brown; apical 1/6−1/5 of segment II, segment III (except for pale extreme base) and segment IV brown. Labium pale brown, partly tinged with red. Pronotum reddish-brown, relatively shining, with posterior 1/3−1/2 darkened and posterior margin pale; anterior mesal part of scutellum sometimes narrowly infuscate; pleura fuscous; scent efferent system creamy yellow. Hemelytron castaneous to reddish-brown, without mottled pattern; border between apex of corium and cuneal base narrowly pale; membrane pale smoky brown, with irregular pale, semitransparent maculae and pale veins. Coxae and legs yellowish brown; apical 1/3−1/2 of metafemur darkened, with two (subapical and apical) pale rings ( Fig. 14F ). Ventral surface of abdomen pale brown, with more or less reddish lateral margins. SURFACE AND VESTITURE: As in generic diagnosis; dorsum with densely distributed, silvery, reclining setae; base of mesepisternum with long, erect setae ( Fig. 30B ); hemelytron rather matte. STRUCTURE: Vertex relatively wide ( Fig. 30C ). Labium reaching apex of metacoxa ( Fig. 13F ). Scutellum weakly swollen, shallowly and sparsely punctate, less rugose.

Metathoracic scent efferent system as in Fig 30B . Metatarsomere II as long as III ( Fig. 30E ); pretarsal structure as in Fig. 30F ; parempodia slightly shorter than claw. MALE GENITALIA ( Figs 15F− J ): Left paramere generally broad, with small, median process and flattened apex ( Fig. 15F ). Vesica with short, narrowed MS, medialy spinulate LS and tiny TP ( Figs 15I–J ). FEMALE GENITALIA ( Figs 9C–D , 16D− E , 30G− I ): Sclerotized ring with thickened anterior rim, posterolateral angle somewhat angulate ( Fig. 16D ); posterior wall ( Figs 30H− I ) with wide, rounded interramal lobe; dorsal structure lacking spinulate processes ( Fig. 30I ).

Measurements. See Table 1.

Differential diagnosis. Recognized and distinguished from other congeners by the following combination of characters: body moderate-sized, ovoid; dorsum with relatively dense, reclining, silvery setae; scutellum less rugose, with sparsely distributed, fine punctures; left paramere generally stout, with a small median process on sensory lobe; posterior wall with rather wide interramal lobe; and dorsal structure lacking spinulate processes.

Biology. Unknown; most of available specimens were collected by UV lighting method at forest zones in the Oriental Region.

Distribution. India (Tamil Nadu), Sri Lanka, Thailand (Chiang Mai); record from Papua New Guinea by CH ḖROT et al. (2017) most probably represents an undescribed species.

Figures

Fig 13. Habitus images of adults (A−E) and immature forms (F−I) for Diognetus laureus sp. nov. A, C − male on Machilus thunbergii (C− holotype); B, E − female; D − male and exuvia (left); F − 4th instar nymph; G − 3rd (left) and 5th instar nymphs; H−I − 5th instar nymph.

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. 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. 14. Habitus images of Diognetus spp.A−C − D. insulanus (Yasunaga, 1994), ♀, dorsal (A) and ventral (B) views; C−F − D. intonsus Distant, 1904, J (C) and ♀ (D) from India, ♀ (E−F) from Thailand. G−I – D. magnificus sp. nov., ♀ (G−H) and holotype J (I).

Fig. 15. Male genitalia of Diognetus insulanus (Yasunaga, 1994) (A−E), D. intonsus Distant, 1904 (F−J) and D. magnificus sp. nov. (K−N). A−B, F−G, K−L − left paramere; C, H, M − right paramere; D−E, I−J, N − vesica (endosoma). Scale bars 0.1 mm.

Fig. 16. Female genitalia of Diognetus insulanus (Yasunaga, 1994) (A−C), D. intonsus Distant, 1904 (D−E) and D. magnificus sp. nov. (F−H). A, F − genital chamber; D − sclerotized ring; B, G − posterior wall; C, E, H − ovipositor (gonapophysis I). Scale bars 0.1 mm.

Fig. 30. Scanning electron micrographs for Diognetus intonsus Distant, 1904,♀ from Chiang Mai, Thailand (A−I) and D. laureus sp. nov.,J from Nagasaki, Japan (J−O). A, K − anterior body, left lateral view; J − left lateral habitus; B, L − scutellum and adjacent structures, left lateral view; C − head and anterior pronotum, dorsal view; D − scutellum and adjacent structures; E−F − metatarsus; G − sclerotized ring; H − posterior wall; I − dorsal structure and interramal lobe; M − dorsal habitus; N − corium; O − posterior corium and anterior cuneus.