Physatocheila miyatakei Miyamoto, 1964

Souma, Jun & Ishikawa, Tadashi, 2022, Taxonomic review of the tingine genera Cysteochila, Hurdchila, Physatocheila, and Xynotingis from Japan, with description of a new genus (Hemiptera: Heteroptera: Tingidae), Zootaxa 5150 (1), pp. 1-42 : 23-24

Physatocheila miyatakei Miyamoto, 1964

( Figs. 8G , 9F , 10F , 11F , 12A–C , 17I , 18I )

Physatocheila miyatakei Miyamoto, 1964: 525 . Holotype: macropterous ♂, Japan: Ishigaki Is., Omoto-san; ELKU.

Physatocheila miyatakei: Azuma & Kinjo (1987: 34) (checklist: Ryukyu Islands); Miyamoto & Yasunaga (1989: 167) (checklist: Japan); Péricart & Golub (1996: 55) (checklist: Palaearctic); Hayashi (2002: 137) (checklist: Ryukyu Islands); Yamada & Tomokuni (2012: 199) (monograph); Yamada & Ishikawa (2016: 432) (checklist: Japan); Souma (2021: 31) (distribution).

Specimens examined. Non-types (5 ♂♂ 9 ♀♀ 1 nymph), JAPAN: Ryukyu Islands: Osumi Islands : Yaku Is., Kurio, alt. 50 m, 22.viii.2021, leg. T. Ono (2 ♀♀, ELKU) . Tokara Islands : Kagoshima-ken, Kagoshima-gun, Toshimamura , Nakanoshima , Nanatsuyama Bch. , 14.iv.2017, leg. Y. Fukuda (1 ♀, TUA) ; Kagoshima-ken, Kagoshima-gun, Toshima-mura , Akusekijima , Yudomari , 15.iv.2017, leg. H. Kojima (1 ♀, TUA) . Amami Islands: Amami Isls., Kikai Is., Hyakunodai , 9.iii.2019, leg. H. Kojima (2 ♀♀, TUA) ; Kagoshima-ken, Tokuno-shima Is., near Mt. Hagedake , 17.ix.2017, leg. N. Tsuji (1 ♂, ELKU) . Yaeyama Islands: Okinawa-ken, Ishigaki-shi, Arakawa , Maesedake , 22.iii.2006, leg. M. Hayashi (2 ♂♂ 2 ♀♀ 1 nymph, TUA) ; Okinawa Pref., Ishigaki Is., Mt. Omoto-dake , 1.v.2014, leg. T. Nakata (1 ♂, TUA) ; Iriomote-jima Is., Shirakawa-rindo , 3.v.1999, leg. T. Shimada (1 ♀, TUA) ; Iriomotejima Is., Ôhara, Fusatoruba , 26.iii.2006, leg. T. Ishikawa (1 ♂, TUA) .

Diagnosis. Recognized among other species of Physatocheila by a combination of the following characters: general color light brown ( Figs. 8G , 9F , 10F , 11F ); median spine on head extending beyond bases of frontal spines; rostrum reaching posterior margin of metasternum; pubescence on pronotum less than 0.5 times as long as diameter of compound eye; lateral carinae of pronotum nearly parallel to each other throughout their length, touching outer margin of paranota at anterior end; paranota incompletely covering pronotal disc in anterior part, not touching each other, not concealing median carina of pronotum, not widened posteriorly, not bulged upward in posterior part, not forming a cyst; outer margin of paranotum nearly straight in its entire length; costal area of hemelytron as wide as subcostal area, less than 0.5 times as wide as discoidal area at widest part, with 2 rows of areolae in its entire length; and subcostal area subhorizontal, with 3 rows of areolae in its entire length.

Description of genitalia. Pygophore ( Figs. 10F , 17I ) compressed dorsoventrally, hexagonal in ventral view, strongly concave at anterior margin of dorsum, elevated at center of venter, smooth on surface, irregularly punctate in middle part of dorsum. Paramere ( Fig. 18I ) expanded in middle part, curved inward in apical part; outer and inner margins covered with pubescence in middle part. Female terminalia ( Fig. 11F ) pentagonal in ventral view, covered with pubescence.

Fifth instar nymph. General color light brown; antennal segment IV and all tarsi black; compound eyes light red ( Fig. 12A–C ). Body oval in shape, 2.1 mm in length; dorsum with countless granular projections on surface. Head with five spines. Antennae smooth on surface, covered with minute pubescence; segments I separated from each other at their bases; segment II shortest among antennal segments; segment III longest among antennal segments; segment IV longer than segment I. Rostrum reaching posterior margin of metasternum. Pronotum with two pairs of spines along midline; anterior pair on anterior part of pronotum and posterior pair on middle part of pronotum; posterolateral angle with a single spine. Mesonotum with a pair of spines on posterior part; mesonotal wing pad reaching anterior margin of abdominal tergite V, with a single spine on outer margin. Metanotum with a pair of spines on posterior part; metanotal wing pad concealed by mesonotal wing pad throughout their length. Legs smooth on surface, longer than rostrum, covered with minute pubescence. Abdomen longer than combined length of head and thorax except mesonotal wing pad; tergite I with a pair of spines on posterior part; tergites II, V, VI and VIII with a single spine along midline; tergites IV–IX with a pair of spines on posterolateral angles.

Remarks. Physatocheila miyatakei closely resembles P. veteris in general appearance but can be distinguished from it by the following characteristics: hood roof-shaped ( Fig. 8G ); lateral carinae of pronotum touching outer margin of paranota at anterior end; and subcostal area with 3 rows of areolae at widest part.

Distribution. Japan (Ryukyu Islands: Yakushima Island, Nakanoshima Island, Akuseki Island, Amami-Oshima Island, Tokunoshima Island, Kikai Island, Ishigaki Island, Iriomote Island).

Physatocheila miyatakei was recorded from Nakanoshima Island, Akuseki Island, Tokunoshima Island, Kikai Island, and Iriomote Island for the first time.

Host plant. Physatocheila miyatakei was collected from Prunus mume (Sieb.) Sieb. et Zucc. (Rosaceae) (Yamada & Tomokuni 2012), which may be its host plant.

Biology. Adults were observed from March to May, and in August and September, and nymphs were observed in March (Miyamoto 1964; Yamada & Tomokuni 2012; present study).

Figures

FIGURE 8. Nine Physatocheila species from Japan. Dried specimens, dorsal view: P. chiniana comb. nov. (A); P. consueta comb. nov. (B); P. distinguenda (C); P. euthenia comb. nov. (D); P. fieberi from Japan proper (E); P. fieberi from the Ryukyu Islands (F); P. miyatakei (G); P. nigrintegerrima (H); P. orientis (I); P. veteris (J). Scale bar: 1.0 mm.

FIGURE 9. Rostra and sternal laminae of nine Physatocheila species from Japan, ventral view: P. chiniana comb. nov. (A); P. consueta comb. nov. (B); P. distinguenda (C); P. euthenia comb. nov. (D); P. fieberi (E); P. miyatakei (F); P. nigrintegerrima (G); P. orientis (H); P. veteris (I). Scale bars: 0.2 mm.

FIGURE 10. Male terminalia of nine Physatocheila species from Japan, ventral view: P. chiniana comb. nov. (A); P. consueta comb. nov. (B); P. distinguenda (C); P. euthenia comb. nov. (D); P. fieberi (E); P. miyatakei (F); P. nigrintegerrima (G); P. orientis (H); P. veteris (I). Scale bars: 0.2 mm.

FIGURE 11. Female terminalia of nine Physatocheila species from Japan, ventral view: P. chiniana comb. nov. (A); P. consueta comb. nov. (B); P. distinguenda (C); P. euthenia comb. nov. (D); P. fieberi (E); P. miyatakei (F); P. nigrintegerrima (G); P. orientis (H); P. veteris (I). Scale bars: 0.2 mm.

FIGURE 12. Fifth instar nymphs of two Physatocheila species from Japan. Dried specimens, dorsal, dorsolateral and lateral views: P. miyatakei (A–C); P. nigrintegerrima (D–F). Scale bar: 1.0 mm.

FIGURE 17. Pygophores of eleven species of Cysteochila and its close relatives from Japan, dorsal view: C. abundantis (A); Limnostatua lewisi comb. nov. (B); Physatocheila chiniana comb. nov. (C); P. consueta comb. nov. (D); P. distinguenda (E); P. euthenia comb. nov. (F); P. fieberi from Japan proper (G); P. fieberi from the Ryukyu Islands (H); P. miyatakei (I); P. nigrintegerrima (J); P. orientis (K); P. veteris (L). Scale bars: 0.1 mm.

FIGURE 18. Parameres of eleven species of Cysteochila and its close relatives from Japan, dorsal view: C. abundantis (A); Limnostatua lewisi comb. nov. (B); Physatocheila chiniana comb. nov. (C); P. consueta comb. nov. (D); P. distinguenda (E); P. euthenia comb. nov. (F); P. fieberi from Japan proper (G); P. fieberi from the Ryukyu Islands (H); P. miyatakei (I); P. nigrintegerrima (J); P. orientis (K); P. veteris (L). Scale bars: 0.1 mm.