Nythomiris, Yasunaga, 2024

Yasunaga, Tomohide, 2024, Reassessment of characters of the ‘ Orientomiris-group’, with descriptions of three new genera and eight new species of the tribe Mirini from the Oriental Region (Hemiptera: Heteroptera: Miridae), Acta Entomologica Musei Nationalis Pragae 64 (2), pp. 397-426 : 417

Nythomiris gen. nov.

Type species. Nythomiris nepalicus sp. nov., here designated.

Diagnosis. Due to lacking stridulatory device, this new genus is excluded from the Orientomiris -group and presumably has a closer relationship to Poppiocapsidea Yasunaga, 1998 (cf. Figs 11E , 15N–P ), from which Nythomiris gen. nov. can be readily distinguished by the pronotum with brown maculae and yellowish posterior margin, and the scutellum and hemelytra almost glabrous. In Poppiocapsidea , the pronotum is usually widely pale, without paler posterior margin ( Fig. 11E ), and the scutellum and hemelytra are uniformly furnished with short, semierect setae ( Fig. 15H ), in addition to different structures of the genitalia (YASUNAGA 1998, CH ḖROT et al. 1999). The 5th (final) instar nymph ( Fig. 3B ) is similar in general appearance (body shape and spotted color pattern) to those of Adelphocorisella species (cf. MIYA- MOTO & YASUNAGA 1993, YASUNAGA 2001); however, the structures of the body surface and genitalia in adults are obviously different between Nythomiris gen. nov. and Adelphocorisella ( Figs 20O–P, MIYAMOTO & YASUNAGA 1993, PAGOLA- CARTE et al. 2022).

Description. Body elongate oval, parallel-sided, rather small (total length 5.0–6.0 mm); basic coloration stramineous brown; dorsal surface shining, with dark maculae as in Figs 3A, C–D , 4E , impunctate, smooth, with sparsely distributed, pale, short, simple setae ( Fig. 15C ). Head smooth, vertical ( Figs 15B, L ); vertex with shallow, longitudinal, mesal sulcation, without basal transverse carina ( Fig. 15L ); clypeus weakly produced. Antenna generally pale brown, long, almost linear, longer than body; segment I shorter than head width across eyes, thicker than segment II; segment II usually shorter than metafemur; segment III usually longer than basal width of pronotum; segment IV longer than I. Labium reaching apex of metacoxa, shorter than metafemur. Thorax: Pronotum smooth, impunctate, nearly glabrous ( Figs 15B, L ), with creamy yellow posterior margin ( Figs 3A, C–D ); calli weakly demarcated from disk ( Figs 15B, L ); mesoscutum with irregular, transverse wrinkles; scutellum shiny creamy yellow, slightly darkened mesally, with dark apex, weakly inflated ( Figs 15B ); metathoracic scent efferent system relatively large ( Figs 15B, M ). Hemelytron pale brown, shining, almost glabrous, densely covered with reticular microstructures ( Fig. 15E ); corium with dark macula medially; apical part of clavus darkened; cuneus reddish brown, with yellowish apex; exocorium (embolium) without serrate margin. Legs long, generally slender; surface of metafemur smooth; tarsi relatively short ( Figs 15H–I ); pretarsal structure as in Figs 15G, J ; pulvilli rather developed. Male genitalia ( Figs 5A–C, E–G , 6D–G , 16A–C, L–P ). Pygophore lacking noticeable process at base of left paramere ( Figs 16A, L ); left paramere semi-circular, with sharply pointed hypophysis ( Figs 5A, E , 16B, N ); right paramere straight, with somewhat flattened and widened hypophysis ( Figs 5B, F , 6D, E ); vesica with four homologous lobal sclerites or spicules ( Figs 6D, F ). Female genitalia ( Figs 5D, H , 16D–K ). Genital chamber with sclerotized anterior margin ( Figs 5D, H , 16D, K ); sclerotized rings thick-rimmed, rather small ( Figs 5D, H , 16D, K ); posterior wall with developed, widened interramal lobes ( Figs 16E, H ), lacking noticeable dorsal structure; interramal lobe with densely distributed, scaly microstructures ( Figs 16F, I ).

Etymology. From Greek, nythos (= dumb, inarticulate, silent) combined with mirid generic name Miris Fabricius, 1794 , referring to included species lacking stridulatory device; masculine.

Biology. Two congeners herein described are considered arboreal.

Distribution. Nepal (Makawanpur), Thailand (Ayutthaya).

Figures

Fig. 11. Habitus images of various mirine plant bugs examined in this study. A – Creontiades bipunctatus Poppius, 1915, female. B – Neomegacoelum vitreum (Kerzhner, 1988), male (left) and female. C – Orientomiris tricolor (Scott, 1880), female. D – O. straminipes (Distant, 1909), female. E – Poppiocapsidea sp., undetermined female specimen from Singapore.F – Sakaeratiella adelphocoroides (Yasunaga, Shishido & Yamada, 2016), holotype male.

Fig. 15. Scanning electron micrographs for Nythomiris nagamasai sp. nov., male (A–H), N. nepalicus sp. nov., male (I–M) and Poppiocapsidea biseratensis (Distant, 1903), female (N–P). A – left lateral habitus. B, K, N – anterior body, left lateral view. C – same, dorsal view. D – thoracic pleura, left lateral view. E – corium and clavus. F – genital segment, left lateral view. G, J – pretarsal structure of hind leg. H, I, P – metatarsus. L, O – head and pronotum, dorsal view. M – metathoracic scent efferent system.

Fig. 3. Habitus images of Oriental mirine plant bugs, live individuals. A – Nythomiris nagamasai sp. nov., male. B – same, final (5th) instar nymph. C – N. nepalicus sp. nov., female from Makawanpur. D – same, from Kathmandu. E–F – Orientomiris andrzeji sp. nov., female.

Fig. 20. Scanning electron micrographs for Sakaeratiella adelphocoroides (Yasunaga, Shishido & Yamada, 2016), holotype male (A–M), and male genitalia of Adelphocorisella lespedezae Miyamoto & Yasunaga, 1993 (N–O).A – anterior body, left lateral view. B – pronotum, scutellum and anterior forewing. C – metathoracic scent efferent system. D – forewing notches. E – metafemur, dorsal surface. F – same, ventral surface. G – apex of metatibia. H – metatarsus. I – pretarsal structure of hind leg. J, N – genital segment (pygophore). K – left paramere. L – right paramere. M, O – vesica.

Fig. 4. Habitus images of Nythomiris nagamasai sp. nov. (A–B) and N. nepalicus sp. nov. (C–E).A, C – male, ventral view. B, D – female, ventral view. E – female, dorsal view.

Fig. 5. Male (A–C, E–G) and female (D, H) genitalia of Nythomiris nagamasai sp. nov. (A–D) and N. nepalicus sp. nov. (E–H). A, E – left paramere. B, F – right paramere. C, G – vesica. D, H – genital chamber.

Fig. 6. Male genitalia of Muttiocapsus cruciger sp. nov.(A–C), Nythomiris nagamasai sp. nov. (D–E), N. nepalicus sp. nov.(F–G), Orientomiris andrzeji sp. nov. (H–J) and O. chiangmai sp. nov. (K–M). A, D, F, H, H – right paramere. B, I, L – left paramere. C, E, G, J, M – vesica.

Fig. 16. Scanning electron micrographs for male and female genitalia of Nythomiris nagamasai sp. nov. (A–G) and N. nepalicus sp. nov. (H–J). A, L – male genital segment (pygophore), dorsal view. B, N – left paramere. C, O–P – vesica. D, K – genital chamber. E–F, H–I – posterior wall. G, J – ovipositor (gonapophysis I). M – right paramere.