Neolygus yonanus, Yasunaga, 2024

Yasunaga, Tomohide, 2024, New species of the plant bug genus Neolygus Knight from Japan, Taiwan and Thailand (Hemiptera: Heteroptera: Miridae: Mirini), Zootaxa 5446 (4), pp. 451-487 : 464

Neolygus yonanus n. sp.

Figs. 5A–B , 9B , 10A–D , 17M–O

Material examined. Holotype (♂). JAPAN: Ryukyus, Okinawa Island, Kunigami Village , Yona , 26.76, 128.22, 21 Feb 1973, H. Hasegawa ( NIAES) ( AMNH _ PBI 00378769 ).

Diagnosis. Currently known by a single male specimen. Most closely related to N. kyushuensis (Yasunaga) ( Fig. 2A–B ), from which N. yonanus n. sp. can be distinguished by its ovoid body ( Fig. 5A ); apical 3/4 of clypeus darkened ( Fig. 5B ); antennal segment II slightly longer than metafemur; labium as long as basal width of pronotum; posterior margin of pronotum, scutellum and clavus darkened ( Fig. 5A ); apical protuberances of parameres more developed ( Fig. 10A–D ); and vesical spiculum tapered apically ( Figs. 9B , 17O ).

Description. Holotype male: Body oval ( Fig. 5A ); dorsum pale brown (probably greenish when alive), with uniformly distributed, pale, simple, reclining setae. Head shining; vertex narrow, with basal transverse carina that is as thick as pronotal collar; apical 3/4 of clypeus darkened ( Fig. 5B ). Antenna pale brown; apex of segment II, whole segments III and IV brown; segment II slightly longer than metafemur; segment III longer than head width across eyes. Labium shiny pale brown, reaching but not exceeding apex of metacoxa. Pronotum shining, darkened posteriorly; scutellum dark brown; pleura including scent efferent system pale brown. Hemelytra somewhat matte; clavus darkened; apical part of corium semi-circularly darkened; membrane pale smoky brown. All coxae and legs pale brown; metafemur with two brown rings that are obliterated ventrally; tibial spines brown; apex of each tarsomere III darkened. Ventral side of abdomen uniformly pale brown.

Male genitalia ( Figs. 9B , 10A–D , 17M–O ): Parameres with rather developed apical protuberance on sensory lobes ( Fig. 10A–D ); vesical spiculum almost straight, tapered and flattened apically ( Figs. 9B , 17O ).

Female: Unknown.

Measurements: See Table 1 .

Etymology. Named for the type locality, Yona (in Kunigami Village, North Okinawa Island); Latinized as an adjective.

Distribution. Japan (Ryukyus: Okinawa Island).

Biology. Collection record suggests that this new species appears earliest (February) among the Japanese congeners. No other information is available on the biology.

Figures

FIGURE 2. Habitus images of living adults and final instar nymphs (C, F) of Neolygus spp. A–C. N. kyushuensis (Yasunaga). D–F. N. tiliicola (Kulik). G. N. tokaraensis (Yasunaga), female.

FIGURE 5. Frontal (G), lateral (B, L), ventral (E) and dorsal habitus images of Neolygus spp., dry-preserved specimens. A–B. N. yonanus n. sp., holotype male. C. N. kyushuensis (Yasunaga), paratype male. D–E. N. tiliicola (Kulik), male from Russian Primorsky Territory. F–G. N. babai n. sp., holotype male. H. N. formosaroseus n. sp., holotype male. I. Same, female. J. N. rufifemoratus n. sp., holotype male. K–L. Same, female.

FIGURE 9. Male (A–D) and female (E–G) genitalia of Neolygus chikanoshima n.sp.(A, E), N.yonanus n. sp. (B), N.kyushuensis (Yasunaga) (C, F) and N. tiliicola (Kulik) (D, G). A–D. Vesica. E–G. Female genital chamber. Scale bars 0.1 mm.

FIGURE 10. Male genitalia of Neolygus yonanus n. sp. (A–D), N. chikanoshima n. sp. (E–F), N. kyushuensis (Yasunaga) (G–H) and N. tiliicola (Kulik) (I–J).A, C, H, I, Left paramere. B, D, G, J, Right paramere. E. Apex of genital segment (pygophore) with parameres, dorsal view. F. Same, ventral view. Scale bars 0.1 mm.

FIGURE 17. Scanning electron micrographs for genitalia of Neolygus kyushuensis (Yasunaga) (A−C, G–I), N. tiliicola (Kulik) (D–F, J–L) and N. yonanus n. sp. (M–O). A, D, Genital chamber. B–C, E–F, Posterior wall [B, paratype from Okinawa Is.; C, from Nagasaki City; E, from Hamamasu, Hokkaido; F from North Korea]. G, J, Apical pygophore (genital segment) with parameres, dorsal view. M, Same, ventral view. H, K, N, Left paramere. I, L, O, Vesica.