Diognetus magnificus, 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 : 28-30

Diognetus magnificus sp. nov.

( Figs 14G− I , 15K− N , 16F− H , 32A− F )

Type material. HOLOTYPE: J, INDONESIA: SUMATRA: North Sumatra, Dolokmaranggir [Dolok Merangir], 3.14100, 99.12600; no date provided, E.W. Diehl ( AMNH _ PBI 00419630 ) ( CNC) . PARATYPE: INDONESIA: SUMATRA: N. Sumatra, Karo,Aek Popo, NW of Lake Toba, N 2.92 E 98.50, 1,700 m, light trap, 1 May 1989, K. Maruyama, 1 ♀ ( TYCN).

Description. Body elongate, large-sized, more than 6.3 mm; 2nd largest species among known congeners. COLORATION: Body generally castaneous ( Fig. 14G− I );

dorsum partly darkened. Head somewhat lighter; frons weakly darkened. Antennae pale brown; segment I partly suffused with red; segments III and IV brown. Labium pale reddish-brown; apex of segment IV infuscate ( Fig. 14H ). Pronotum widely darkened posteriorly, with yellowish posterior margin; calli with a pair of dark, ovoid spots; mesoscutum pale brown; scutellum uniformly darkened in J ( Fig. 14I ) or pale brown with dark mesal and lateral stripes in ♀ ( Fig. 14G ); pleura widely fuscous; scent efferent system creamy yellow. Hemelytron castaneous, with dark irregular spots in ♀; cuneus tinged with red, with yellowish extreme apex; membrane pale smoky brown, with distally pale veins and two semitransparent spots posterior to apex of cuneus. Coxae and legs pale brown; meso- and metafemora darkened except for pale bases; apical half of each tarsomere III brown. Ventral surface of abdomen dark brown, with paler median part in ♀. SURFACE AND VESTITURE: As in generic diagnosis; dorsal surface weakly shining, with rather sparsely distributed, silvery, reclining setae; scutellum less rugose, sparsely and finely punctate; hemelytron rather matte. STRUCTURE: Antennal segment I obviously longer than segment IV. Labium longer than basal width of pronotum, reaching but not exceeding apex of mesocoxa. Scutellum weakly arched. Metathoracic scent efferent system as in Fig. 32B . Metatarsomere II almost equal in length to III ( Fig. 32C ). MALE GENITALIA ( Figs 15K− N ): Left paramere with a conical process at middle and developed, squared protuberance of sensory lobe ( Fig. 15K ). Vesica with short MS and well-sclerotized, spicule-like LS; RS with weak TP ( Fig. 15N ). FEMALE GENITALIA ( Figs 16F− H , 32A− F ): Sclerotized ring thickened anteriorly ( Figs 16F , 32D ); posterior wall ( Figs 16G , 32E ) with narrow dorsal structure; interramal lobe relatively wide with rounded lateral margin; micro-spines on interramal lobe with 2−4 sharp branches ( Fig. 32F ).

Measurements. See Table 1.

Differential diagnosis. Recognized by its large size; long antennal segment I that is longer than IV; short labium not exceeding apex of mesocoxa; and male and female genitalic structures as described above. Externally most similar to D. dhampus sp. nov. from Nepal, from which D. magnificus sp. nov. can be distinguished by the larger size, antennal segment I longer than IV, and darkened metafemur.

Etymology. Latin adjective magnificus (= magnificent), referring to the large-sized body of this new species.

Biology. Unknown.

Distribution. Indonesia (N. Sumatra).

Figures

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. 32. Scanning electron micrographs for Diognetus magnificus sp. nov., ♀ from N. Sumatra, Indonesia (A−F) and D. pilosus (Poppius, 1914), ♀ from W. Malaysia (K−M) and Sumatra (G−J, N−P). A − scutellum and adjacent structures, left lateral view; B, I − pleura and scent efferent system, left lateral view; C, J − metatarsus; D, K, N − sclerotized ring; E, O − posterior wall; F, M − interramal lobe; L, P − dorsal structure and interramal lobe.