Orthonotus takaii, Yasunaga, 2022

Yasunaga, Tomohide, 2022, The plant bug subfamily Phylinae in Japan, with key to genera and descriptions of eight new species (Hemiptera: Heteroptera: Miridae), Zootaxa 5094 (1), pp. 1-52 : 22

Orthonotus takaii n. sp.

( Fig. 9 D−E; 10B−C, H−I; 16; 23J−O; 24I−L, O; 25G−L)

Orthonotus bicoloripes (misidentification, non Kerzhner, 1988): Yasunaga, 2001: 167, pl. 25, fig. 101 (diag.); Komatsu, 2016: 106 (local fauna).

Material examined. Holotype (♂). JAPAN: Nagano Pref., Matsumoto City, Iriyamabe, Tobira Hot-spring , 36.187, 138.082, 5 Jul 1999, M. Takai ( AMNH) ( AMNH _ PBI 00380703 ) . Paratypes: JAPAN: Honshu , same data as for holotype, 3♂ 1♀ ( TYCN) ; Nagano Pref., Matsumoto City, Shima-uchi, Nature Park , 36.266, 137.955, Malus toringo flowers, 4 Jul 1999, M. Takai, 3♂ 4♀ ( TYCN) ; Aomori Pref., Takko-machi, Ryugamori , 40.31, 141.01, 28 Jun 1987, T. Ichita, 1♂ 1♀ ( TYCN) (1♂ with USIs, 00380704) ; Okayama Pref., Ibara City, San’nou , 34.577, 133.466, 16 Jun 1993, Wesco Co., 1♀ ( TYCN) (00380705) .

Diagnosis. Recognized by the characters mentioned in above key and generic diagnosis. This new Japanese species was previously regarded conspecific with O. bicoloripes by Yasunaga (2001d) as a single female specimen of the latter ( Fig. 9G ) was available for comparison at the time. However, based on increased information, Orthonotus takaii n. sp. can be distinguished from O. bicoloripes by the following different features: Not sexually dimorphic (body ovoid in both sexes); all femora uniformly chocolate brown; basal 5/2−1/2 of each tibia darkened; and apical part of vesica distinctly elongate ( Figs. 10C , 24L ).

Description. Body ovoid in both sexes, declivous at cuneal fracture ( Figs. 9E , 23J ), not sexually dimorphic in coloration and external structures; basic coloration dark brown ( Fig. 9 D−E); dorsal surface weakly shining, with relatively sparsely distributed, brown, simple setae and silvery, reclining, lanceolate setae ( Fig. 23L , 24O ). Head fuscous; eye relatively large. Antenna dark brown, except for median part of segment II (base and apical 1/3−2/5 darkened as in Fig. 9D ); segment II as long as mesotibia (♂)/ shorter than mesotibia (♀). Labium shiny chocolate brown, its apex reaching but not exceeding apex of metacoxa; segment III and basal half of segment IV yellowish brown. Pronotum, mesoscutum and scutellum shiny fuscous; pleura chocolate brown; metathoracic scent efferent system as in Fig. 23M . Hemelytron shiny dark brown; membrane smoky brown. All coxae and legs chocolate brown; trochanters pale reddish brown; all femora uniformly darkened; basal 2/5−1/2 of each tibia darkened; tibial spines pale reddish brown; all tarsi yellowish brown; pretarsal structure as in Fig. 23O ; pulvilli occupying basal half of claw; parempodia hairlike. Abdomen shiny chocolate brown. Male genitalia ( Figs. 10 B−C; 24I−L): Ventral apical part of pygophore with distinct mesal keel ( Figs. 10B , 24I ); phallotheca gradually sharpened towards apex ( Fig. 24J ); vesica sigmoid, elongate apically, terminated in hook-shape ( Figs. 10C , 24K–L ). Female genitalia ( Figs. 10 H−I; 25G−L): Sclerotized rings thick-rimmed, subtriangular ( Figs. 10H , 25K ); posterior wall relatively wide ( Fig. 25G ).

Measurements: See Table 3 .

Etymology. Named for Mr. M. Takai who collected and provided valuable specimens herein designated as type series.

Distribution. Japan (Honshu, Kyushu).

Biology. More than a few adults were collected from inflorescence of Malus toringo (Sieb.) Sieb. (Rosaceae) (Takai, pers. obs.).A univoltine life cycle is assumed, based on collection records.However, no additional information is available on their biology.

Figures

FIGURE 9. Habitus images of Orthonotus spp. A−C, H. O. nakagawai n. sp. D–E. O. takaii n. sp. F–G. O. bicoloripes (from Primorsky, FE Russia). A, D, E, F, H. Male. B, G. Female. C. Fifth instar nymph. Images courtesy of Y. Nakagawa, Akita (A–C) and M. Takai, Kochi (D).

FIGURE 10. Male (A−E) and female (F−I) genitalia of Orthonotus spp. A. O. bicoloripes (from Primorsky, FE Russia). B–C, H–I. O. takaii n. sp. D−G. O. bicoloripes n. sp. A, C, E. Vesica (endosoma). B. Genital segment (pygophore), right lateral view. D. Same, left lateral view. F & H. Bursa copulatrix, ventral view. G & I. Apex of ovipositor (gonapophysis I). Scale bars 0.2 mm.

FIGURE 23. Scanning electron micrographs for Orthonotus bicoloripes (A−C, M), O. nakagawai n. sp. (D−I) and O. takaii n. sp. (J−O). A, D, J. Left lateral habitus. B, E, K, L. Dorsal habitus. C, F, M. Thoracic pleura, left lateral view. G. Ventral habitus. L. Clavus and corium. H, I, N, O. Metatarsus.

FIGURE 24. Scanning electron micrographs for Orthonotus bicoloripes (A−C, M), O. nakagawai n. sp. (D−H, N) and O. takaii n. sp. (I−L, O). A, E, J. Male genital segment (pygophore), dorsal view. D, I. Same, with apicoventral keel, left lateral view. B−C, G−H, K−L. Vesica. M−O. Silvery setae on corium.

FIGURE 25. Scanning electron micrographs for female genitalia of Orthonotus nakagawai n. sp. (A−F), O. takaii n. sp. (G−L) and Psallus nigricornis Yasunaga & Vinokurov (M–O). A–C, G–I, M–O. Posterior wall. D, J. Bursa copulatrix, dorsal view. E, K. Sclerotized rings. F, L. Apex of ovipositor (gonapophysis I). Abbreviations—IRL: (undifferentiated) interramal lobe, IRS: interramal sclerite, PMS: posterior margin sclerite, SCR: sclerotized rings.