Chelyolygus parsanus, 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 : 379-382

Chelyolygus parsanus , new species

( Figs. 4 F−J, 5E−H, 21H–O, 22A–D)

Type material. Holotype: male, NEPAL: Makawanpur Dist. : Chitwan National Park, Machan Resort [current Parsa Wildlife Reserve], 27°32′06″N, 84°44′17″E, 270 m, on flowers of Mallotus sp. , T. Yasunaga, M. Takai & B. Shishido, 7–9 November 2005 ( NMTU) ( AMNH _ PBI 00378792 ) . Paratypes: NEPAL: 2 males, 8 females, same data as for holotype ( TYCN, ZRC) .

Diagnosis. Chelyolygus parsanus , new species, is most closely related to C. fuhoshoensis but can be distinguished by the characters mentioned in the above key and the following characters: Relatively smaller body with shorter antennomere II, labium and metafemur; paler maculae on scutellum and hemelytron; shorter hypophysis of left paramere ( Figs. 5F , 22A ); generally shorter vesical spicules ( Figs. 5H , 22B ); smaller sclerotised rings ( Fig. 4J ); and posterior wall with narrower dorsal structure and sparse spinules on anterior interramal sclerite ( Fig. 22C, D ).

Description. Body generally stramineous brown, ovoid, moderate in size; dorsal surface shining, with brown to dark brown stripes and maculae as in Figs. 4F, G , 7D . Head shiny pale brown, with sparsely distributed, short, semi-erect setae; clypeus fuscous; vertex with basal transverse carina concaved mesad, about as thick as pronotal collar ( Fig. 21J ). Antenna pale brown; antennomere I with dark apex; apical ¼–⅓ of antennomere II darkened; antennomeres III and IV dark brown, except for pale base of antennomere III. Labium shiny pale brown, reaching but not exceeding middle of metacoxa; apical part of segment IV dark reddish brown. Pronotum shiny pale brown, with sparsely distributed, short, reclining setae and minute punctures ( Fig. 21I, J ); calli usually with a pair of dark spots; pleura pale brown; metathoracic scent efferent system creamy yellow, with small, triangular peritreme ( Fig. 21L ); scutellum polished, with brown mesal stripe and dark apex, finely and shallowly punctate, with uniformly distributed, short, semi-erect setae ( Fig. 21I ). Hemelytron shining, stramineous brown, with striped pattern as in Figs. 4F, G , 7D , with uniformly distributed, semi-erect or reclining setae ( Fig. 21H ); apex of cuneus narrowly brown; membrane pale smoky brown. All coxae and legs pale brown; metafemur apically with two brown rings; apex of each tarsomere III dark brown; pretarsal structures as in Fig. 21N ; parempodia relatively short, narrow. Abdomen pale brown. Male genitalia ( Figs. 5 E−H, 21O, 22A, B): Left paramere stout, L-shaped, with short hypophysis ( Figs. 5F , 22A ); right paramere with short, tapered hypophysis ( Fig. 5G ). Vesica with two apically tapered spicules ( Fig. 5H , 22B , 1–2 ); lobal-sclerite ( Fig. 5H , 3 ) relatively short. Female genitalia ( Figs. 4I, J , 22C, D ): sclerotised rings elongate ovoid, narrow ( Fig. 4J ); ovipositor (gonapophysis I) as in Fig. 4I ; posterior wall with small, rounded dorsal structure and sparse spinules on anterior interramal sclerite ( Fig. 22C, D ).

Measurements. See Table 1.

Etymology. Named for the type locality, Parsa Nature Reserve in S. Nepal; adjective.

Distribution. Nepal (Makawanpur District).

Biology. This new species was found to co-occur with Euphorbialygus rufobrunneus , new species, on inflorescence of Mallotus sp. ( Fig. 8H ). However, no immature form was confirmed.

Figures

Fig. 4. Habitus images (A–C, F–H) and female genitalia (D, E, I, J) of Chelyolygus fuhoshoensis (A–E) and C. parsanus, new species (F–J). A, B, F, G, Male; C, H, female; D, I, ovipositor (gonapophysis I); E, J, genital chamber with sclerotised rings and adjacent structures.

Fig. 5. Male genitalia of Chelyolygus fuhoshoensis (A–D) and C. parsanus, new species (E–H). A, E, Genital segment (pygophore) in dorsal (A) and ventral (E) views; B, F, left paramere; C, G, right paramere; D, H, vesica. Scale bars 0.2 mm.

Fig. 22. Scanning electron micrographs of Chelyolygus fuhoshoensis (A–D), C. parsanus, new species (F–I), C. virgulatellus, new species (J–O) and Apolygopsis furvocarinatus (E). A, F, Left paramere; B, G, vesica; C–E, H, I, posterior wall; J, anterior body, dorsal view; K, left lateral habitus; L, M, apex of pygophore, left lateral view; N, metatarsus; O, pretarsal structure of metaleg. Abbreviations: DOS = dorsal structure, IRL = interramal lobe, IRS = interramal sclerite, LLB = lateral lobe.

Fig. 7. Habitus images and habitats (J, L) of Chelyolygus wolskiorum, new species (A–C), C. parsanus, new species (D), Himalisundacoris duwalae, new species (E, F), Sabactiopus schuhi, new species (G, H) and S. sauteri (K). A, E, G, K, Adult male; B, D, F, H, I, adult female; C, final (5th) instar immature form; J, deciduous-broadleaf mixed forest with Urtica dioica, on which Himalisundacoris duwalae, new species, and Sabactiopus schuhi, new species, coexist (Lalitpur, Nepal); L, Styrax formosanus inflorescences, one of the breeding hosts of Sabactiopus sauteri (Nantou, Taiwan).

Fig. 21. Scanning electron micrographs of Chelyolygus fuhoshoensis (A–G) and C. parsanus, new species (H–O). A, Head and pronotum, dorsal view; B, H, dorsal habitus; C, J, anterior body, left lateral view; D, L, metathoracic scent efferent system; E, M, metatarsus; F, N, pretarsal structure of metaleg; G, O, male genital segment (pygophore) with parameres, dorsal view; I, pronotum, scutellum and anterior corium, dorsal view; K, thoracic pleura, left lateral view.

Fig. 1. Habitus images of Chelyolygus species. A, B, Chelyolygus tabananicus, new species, holotype female in dorsal (A) and ventral (B) views; C, D, C. cheroti, new species, male; E, F, ditto, female; G, C. wolskiorum, new species, female in ventral view; H, ditto, holotype male in ventral view; I, C. bipuncticollis, male in dorsal view; J, ditto in right lateral view.

Fig. 2. Male (A–E) and female (F–H) genitalia of Chelyolygus bipuncticollis (A–E) and C. tabananicus, new species (F–H). A, B, Vesica; C, left paramere; D, E, right paramere; F, genital chamber with sclerotised rings and adjacent structures; G, posterior wall; H, apex of ovipositor (gonapophysis I). Scale bars 0.2 mm.

Fig. 3. Male (A–D, G–J) and female (E, F, K, L) genitalia of Chelyolygus wolskiorum, new species (A–F) and C. cheroti, new species (G–L). A, Apex of pygophore; B, G, left paramere; C, H, right paramere; D, I, J, vesica; E, K, genital chamber with sclerotised rings and adjacent structures; F, L, posterior wall. Scale bars 0.2 mm.

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.