Taxonomic study of the subgenus Tropidocheila of the lace bug genus Tingis (Hemiptera: Heteroptera: Tingidae) from Japan, with description of Tingis (Tropidocheila) yamaboushi sp. nov. collected from Cornus kousa (Cornaceae) Author Souma, Jun 0000-0002-2238-5015 Entomological Laboratory, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan. kodokusignal @ gmail. com; https: // orcid. org / 0000 - 0002 - 2238 - 5015 & Research Fellowship for Young Scientists (DC 1), Japan Society for the Promotion of Science, Tokyo, Japan kodokusignal@gmail.com text Zootaxa 2020 2020-10-27 4868 2 284 294 journal article 8919 10.11646/zootaxa.4868.2.8 d1902871-8128-49e0-ad62-f613a1418bec 1175-5326 4417706 65BC2983-0BD3-4545-8E29-952DA89A251B Tingis ( Tropidocheila ) yamaboushi sp. nov. ( Figs. 1 C–G, 2D–F, 3C, D, 4C, 5C, D) Type series. HOLOTYPE (macropterous ♂ ), JAPAN : Honshu : Tokyo , Okutama-cho , Nippara , Mt. Issekisan , 15.viii.2018 , leg. M. Genka ( ELKU ) . PARATYPES (macropterous 9 ♂♂ 7 ♀♀ ), JAPAN : Honshu : as holotype ( 3 ♂♂ 2 ♀♀ , ELKU ) ; Tokyo-to , Okutama-machi , Nippara , Yokosuzu Mountain Ridge, 24.vii.2019 , leg. Y. Noto ( 1 ♂ , ELKU ) ; Ishikawa-ken , Kanazawa-shi , Obishike-machi , Nishiodaira–Shigarakubi , 30.vi.2020 , leg. T. Saeki ( 1 ♂ , TUA ) ; Ishikawa-ken , Kanazawa-shi , Obishike-machi , 3631'44" N 13646 '13"E, 30.vi.2020 , leg. T. Saeki ( 3 ♂♂ 2 ♀♀ , TUA ) ; Ishikawa-ken , Kanazawa-shi , Tanoshima-machi , Iôzen , Nishiodaira , 16.vi.2020 , leg. H. Fukutomi ( 1 ♀ , IIM ) ; as above but 24.vi.2018 , leg. N. Tsuji ( 1 ♂ 2 ♀♀ , ELKU ) ( Fig. 7 ). Diagnosis. Recognized among other species of Tropidocheila by a combination of the following characters: general color brown ( Fig. 1 C–G); pubescence on dorsum shorter than diameter of compound eye; head with four spines ( Fig. 4C ); a pair of frontal spines reaching beyond tip of clypeus; a pair of occipital spines reaching middle part of compound eye; rostrum reaching posterior margin of metasternum ( Fig. 2D ); anterior margin of hood curved inward throughout its length; lateral carinae of pronotum indistinct on pronotal disc; paranotum ridge-shaped, subvertical, with 2 rows of areolae in anterior part and a single row in middle part, without areolae in posterior part ( Fig. 2E ); costal area of hemelytron with 2 rows of areolae throughout its length, narrower than subcostal area at widest part of each ( Fig. 2F ); subcostal area with 4 rows of areolae at widest part; discoidal area with 9–10 rows of areolae at widest part; and sutural area with 13–14 rows of areolae at widest part. Tingis ( Tropidocheila ) yamaboushi sp. nov. resembles T . ( Tr .) matsumurai in general appearance, although the former can be easily distinguished from the latter based on the following characteristics: general color brown ( Fig. 1 C–G); head with four spines ( Fig. 4C ); rostrum reaching posterior margin of metasternum ( Fig. 2D ); anterior margin of hood curved inward throughout its length; lateral carinae of pronotum indistinct on pronotal disc; paranotum with 2 rows of areolae in anterior part and a single row in middle part, without areolae in posterior part ( Fig. 2E ); subcostal area of hemelytron with 4 rows of areolae at widest part ( Fig. 2F ); and sutural area with 13–14 rows of areolae at widest part. In contrast, T . ( Tr .) matsumurai presents the following characteristics: general color black ( Fig. 1A ); head with five spines ( Fig. 4A ); rostrum reaching middle of metasternum ( Fig. 2A ); anterior margin of hood curved outward throughout its length; lateral carinae of pronotum distinct on pronotal disc; paranotum with a single row of areolae in anterior half, without areolae in posterior half ( Fig. 2B ); subcostal area of hemelytron with 3 rows of areolae at widest part ( Fig. 2C ); and sutural area with 11–12 rows of areolae at widest part. FIGURE 1. Three species of Tingis ( Tropidocheila ) from Japan, dorsal and lateral views: T . ( Tr .) matsumurai (A); T . ( Tr .) shaowuana (B); T . ( Tr .) yamaboushi sp. nov. , male (C–E) and female (F, G). Arrow marks antenna with segmental oligomery. Scale bar: 1.0 mm. Description. Macropterous male. General color brown; compound eye dark red; head, apical part of antennal segment IV, calli and sterna black; buccula and sternal laminae ashen; pubescence on body yellowish ( Figs. 1 C–G, 2D–F, 3C, D). Body ( Fig. 1 C–E) covered with pubescence, 2.3 times as long as maximum width across hemelytra. Head ( Fig. 4C ) with four spines; a pair of frontal spines reaching beyond tip of clypeus, as long as occipital spine; a pair of occipital spines reaching middle part of compound eye; antenniferous tubercles angular, curved inward. Antennae smooth; segment I cylindrical; segment II narrower than segment throughout their length; segment III narrowest among antennal segments; segment IV fusiform, as wide as segment II at widest part of each; pubescence on segment IV irregularly longer than pubescence on other antennal segments; ratios of lengths from segments I to IV as 1.0: 1.0: 5.6: 2.4. Bucculae without distinct areolae. Rostrum ( Fig. 2D ) reaching posterior margin of metasternum. FIGURE 2. Rostra of and sternal laminae of two species Tingis ( Tropidocheila ) from Japan, ventral view: T . ( Tr .) matsumurai (A); T . ( Tr .) yamaboushi sp. nov. (D). Pronota and hemelytra of two species of Tingis ( Tropidocheila ) from Japan, dorsolateral view: T . ( Tr .) matsumurai (B, C); T . ( Tr .) yamaboushi sp. nov. (E, F). Scale bars: 0.2 mm. Pronotum ( Figs. 1C, D , 2E , 4C ) 1.5 times as long as maximum width across paranota. Pronotal disc coarsely punctate. Hood roof-shaped; anterior margin curved inward throughout its length. Pronotal carinae without areolae; median carina straight, extending to apex of posterior process, higher than hood at maximum height; lateral carinae nearly parallel to each other, indistinct on pronotal disc, distinct on posterior process, lower than median carina. Calli smooth. Paranotum widened anteriorly, ridge-shaped, subvertical, with 2 rows of areolae in anterior part and a single row in middle part, without areolae in posterior part; outer margin curved outward throughout its length. Posterior process 1.3 times as long as its maximum width. FIGURE 3. Apical part of the abdomen of two species of Tingis ( Tropidocheila ) from Japan, ventral view: T . ( Tr .) matsumurai , male (A) and female (B); T . ( Tr .) yamaboushi sp. nov. , male (C) and female (D). Scale bars: 0.2 mm. Hemelytron ( Figs. 1C, D , 2F ) 2.5 times as long as its maximum width; maximum width across hemelytra 1.4 times as much as maximum width across paranota; costal area with 2 rows of areolae throughout its length, narrower than subcostal area at widest part of each; subcostal area with 4 rows of areolae at widest part; discoidal area expanding beyond middle of hemelytron, with 9–10 rows of areolae at widest part; sutural area with 13–14 rows of areolae at widest part; hypocostal lamina with a single row of areolae throughout its length. Thoracic pleura coarsely punctate ( Fig. 1E ). Sternal laminae ( Fig. 2D ) apparently lower than bucculae, open in anterior and posterior ends; prosternal lamina nearly straight, lower than mesosternal lamina; meso- and metasternal laminae curved outward throughout its length, as high as each other. Legs smooth; femora thickest at middle ( Fig. 1C, D ). Abdomen ellipsoidal, 1.3 times as long as its maximum width. Pygophore ( Figs. 3C , 5D ) compressed dorsoventrally, hexagonal in ventral view, elevated at center of venter, concave at anterior margin of dorsum. Paramere ( Fig. 5C ) expanded in middle part, curved inward in apical part; outer and inner margins covered with pubescence in middle part. Measurements ( holotype ). Body length with hemelytra 3.4 mm ; maximum width across hemelytra 1.5 mm ; pronotal length 1.7 mm ; pronotal width across paranota 1.1 mm . FIGURE 4. Heads and pronota of three species of Tingis ( Tropidocheila ) from Japan: T . ( Tr .) matsumurai (A); T . ( Tr .) shaowuana (B); T . ( Tr .) yamaboushi sp. nov. (C). Scale bars: 0.2 mm. FIGURE 5. Parameres and pygophores of two species of Tingis ( Tropidocheila ) from Japan, dorsal view: T . ( Tr .) matsumurai (A, B); T . ( Tr .) yamaboushi sp. nov. (C, D). Scale bars: A, C, 0.1 mm; B, D, 0.2 mm. FIGURE 6. Living mature and teneral adults (A, B) of Tingis ( Tropidocheila ) matsumurai from Tochigi, Honshu, Japan (photographs taken in captivity). Feeding habitat of adult of T . ( Tr .) matsumurai (C) on host tree Cornus controversa at Fukuoka, Kyushu, Japan (photographs taken in field). Macropterous female. General appearance similar to that of male ( Fig. 1F, G ) except for the following characters: body 2.2 times as long as maximum width across hemelytra; apical part of abdomen ( Fig. 3D ) pentagonal in ventral view, covered with pubescence; ovipositor with ovivalvula at base. Infraspecific variation among both sexes ( holotype and 16 paratypes ). Body length with hemelytra 3.2–3.7 mm ; maximum width across hemelytra 1.3–1.6 mm ; pronotal length 1.5–1.9 mm ; pronotal width across paranota 1.0– 1.2 mm . Brachypterous morph unknown in both sexes. Remarks. In the key to the Japanese species of Tingis ( Takeya 1962 ; Yamada & Tomokuni 2012 ), the new species described above differs from other species in having a ridge-shaped paranotum with two rows of areolae in the anterior part and a single row of areolae in the middle part, without areolae in the posterior part ( Fig. 2E ). Segmental oligomery of the antennae is confirmed in T . ( Tr .) yamaboushi sp. nov. , as one examined individual lacked antennal segment IV ( Fig. 1C ). In other species of Tingis , including T . ( Tingis ) ampliata , T . ( T .) cardui (Linnaeus, 1758) , T . ( T .) grisea Germar, 1835, T . ( T .) lasiocera , and T . ( Tr .) reticulata Herrich-Schäffer, 1835, similar teratological forms have been described ( Štusák & Stehlík 1978 ; Souma 2020 ). Segmental oligomery of antennae may be common in species of Tingis . Distribution. Japan (Honshu). In Japan , Tingis ( Tropidocheila ) yamaboushi sp. nov. inhabits deciduous forests with temperate climate. Etymology. The specific epithet is the Japanese plant name yamaboushi (= Cornus kousa Buerger ex Hance ), referring to the host plant of the new species; a noun in apposition. Host plant. All type materials of Tingis ( Tropidocheila ) yamaboushi sp. nov. were collected from Cornus kousa (Cornaceae) by my colleagues Yasutaka Noto, Masaaki Genka, Hirokazu Fukutomi and Tomoya Saeki, suggesting that the new species feeds on this cornaceous plant. Biology. Adults were collected from June to August. Nymph and overwintering form are unknown.