Euphorbialygus rufobrunneus, Yasunaga, 2024

Yasunaga, Tomohide, 2024, New genera and species of the ‘ Lygus-complex’ ranging from the Himalaya-Oriental to the Wallacea region (Insecta: Heteroptera: Miridae: Mirinae), Raffles Bulletin of Zoology 72, pp. 371-423 : 389-392

Euphorbialygus rufobrunneus , new species

( Figs. 8E, F, H , 9 F−H, 10G–I, 25)

Type material. Holotype: male, NEPAL: Makawanpur Dist. , Chitwan National Park, Machan Resort [current Parsa Wildlife Reserve], 7°32′06″N, 84°44′17″E, 270 m, on flowers of Mallotus sp. , 7–9 November 2005, T. Yasunaga, M. Takai & B. Shishido ( NMTU) ( AMNH _ PBI 378781 ) . Paratypes: 5 males, 3 females, same data as for holotype ( AMNH, TYCN, ZRC) .

Diagnosis. Euphorbialygus rufobrunneus , new species, is distinguished from E. nanglong , new species, by its larger size; densely distributed, micro-setae on pronotal collar; larger and triangular dark spot on cuneus; longer hypophysis and weakly inflated sensory lobe of left paramere; shorter flagellate lobal-sclerite on vesica; smaller paired process on posterior wall; and more densely distributed scaly microstructures on interramal lobe.

Description. Body generally dark reddish brown, oval, comparatively large in size; dorsal surface weakly shining ( Fig. 8A, C ). Head shiny brown, with sparsely distributed, short, semi-erect setae; jugum and lorum pale brown, partly suffused with red; clypeus dark brown. Antenna dark brown; antennomere I pale reddish brown, with basal ⅓–½ darkened; antennomere II with pale basal ⅓–½ and basal dark ring; extreme base of antennomere III creamy yellow. Labium shiny pale brown, reaching but not exceeding apex of metacoxa; segment IV darkened. Pronotum shining, uniformly castaneous; collar densely furnished with micro-setae or pruinosity ( Fig. 25B ) pleura pale brown; ventral margin of propleuron, posterior margin of mesepisternum and metathoracic scent efferent system creamy yellow; scutellum castaneous, without noticeable spot or macula ( Fig. 8E ). Hemelytra weakly shining, reddish chocolate brown; cuneus sanguineous, with a dark, semi-circular spot contiguous to lateral margin (cf. Fig. 8E, F ); membrane smoky brown, with pale red veins. All coxae and legs pale brown, partly suffused with red; apical part of each femur more or less darkened; each tarsomere III dark brown; pretarsal structures as in Fig. 25G . Abdomen pale brown, partly with reddish spots. Male genitalia ( Figs. 9 F−H, 25H–J): Hypophysis of left paramere stout, long ( Fig. 9F , 25I ). Vesical spicule thick, curved subapically; flagellate lobal-sclerite comparatively short ( Fig. 9H , 25J, K ). Female genitalia ( Figs. 10 G−I, 25L–O): Sclerotised rings relatively enlarged ( Figs. 10G , 25M ); anterior paired process on posterior wall weak, reduced ( Fig. 25N ); interramal lobes narrow, with rather densely distributed scaly microstructures on distal half ( Fig. 25O ).

Measurements. See Table 1.

Etymology. From Latin, ‘rufo’ (or ‘ruber’ = red) + ‘brunneus’ (brown), referring to the general colouration of this new species; adjective.

Distribution. Nepal (Makawanpur District).

Biology. All available specimens were collected by sweep-netting the inflorescences of Mallotus sp. ( Euphorbiaceae ) ( Fig. 8H ). No other information is currently available.

Figures

Fig. 8. Habitus images and habitats (G, H) of Euphorbialygus nanglong, new species from Nakhon Nayok, Thailand (A–D, G) and E. rufobrunneus, new species from Chitwan National Park, Nepal (E, F, H). A, B, Male; C, E, F, female; D, 5th instar nymph; G, Homonoia riparia; H, Mallotus sp.

Fig. 9. Male genitalia of Euphorbialygus nanglong, new species (A–E) and E. rufobrunneus, new species (F–H). A, B, F, left paramere; C, D, G, right paramere; E, H, vesica. Scale bars 0.2 mm.

Fig. 25. Scanning electron micrographs of Euphorbialygus rufobrunneus, new species. A, head and thorax, left lateral view; B, head and anterior pronotum, dorsal view; C, metathoracic scent efferent system; D, anterior body, dorsal view; E, scutellum, clavus and corium, dorsal view; F, metatarsus; H, pretarsal structure of metaleg; H, pygophore, dorsal view; I, left paramere; J, K, vesica; L, genital chamber and ovipositor (gonapophysis I); M, genital chamber; N, O, posterior wall.

Fig. 10. Female genitalia of Euphorbialygus nanglong, new species (A–F) and E. rufobrunneus, new species (G–I). A, Genital chamber with ovipositors (gonapophyses II), ventral view; C, G, genital chamber, ventral view; D, ditto, dorsal view; E, sclerotised ring; F, I, posterior wall, anterior view; apex of ovipositor (gonapophysis I). Scale bars 0.2 mm.