Physatocheila nigrintegerrima Souma, 2019

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 : 24-27

Physatocheila nigrintegerrima Souma, 2019

( Figs. 8H , 9G , 10G , 11G , 12D–F , 14A–C , 17J , 18J )

Physatocheila nigrintegerrima Souma, 2019: 265 . Holotype: macropterous ♂, Japan: Honshu , Niigata-ken , Nagaoka-shi, Suyoshi-machi, Magihanzogana-rindo; TUA.

Physatocheila nigrintegerrima: Maehara (2019: 109) (distribution); Yazaki (2019: 3) (distribution); Konno (2020: 18) (distribution).

Specimens examined. Non-types (11 ♂♂ 11 ♀♀ 4 nymphs), JAPAN: Honshu: Aomori Pref., Hirosaki , 4.viii.1953, leg. N. Fukuhara (1 ♀, NIAES); Tochigi-ken , Haga-gun , Motegi-machi , Makino , 3634'20.5" N 14011 '26.0"E, 10.vii.2019, leg. J. Souma (11 ♂♂ 10 ♀♀ 4 nymphs, TUA) .

Diagnosis. Recognized among other species of Physatocheila by a combination of the following characters: general color black ( Figs. 8H , 9G , 10G , 11G ); median spine on head reaching level far remote from bases of frontal spines; rostrum reaching middle part of metasternum; pubescence on pronotum less than 0.5 times as long as diameter of compound eye; lateral carinae of pronotum close to each other in anterior part, concealed by paranotum in anterior part; paranota incompletely covering pronotal disc in anterior part, not touching each other, not concealing median carina of pronotum, widened posteriorly, not bulged upward in posterior part, not forming a cyst; outer margin of paranotum gently curved outward in its entire length; costal area of hemelytron narrower than subcostal area at widest part, 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. 10G , 17J ) 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. 18J ) expanded in middle part, curved inward in apical part; outer and inner margins covered with pubescence in middle part. Female terminalia ( Fig. 11G ) pentagonal in ventral view, covered with pubescence.

Fifth instar nymph. General color naturally yellow but brown in dried specimen; head dark yellow, antennae and legs black; compound eyes red ( Fig. 12D–F ). Body oval in shape, 2.5–2.7 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 middle part of metasternum. Pronotum without spines. Mesonotum without spines; mesonotal wing pad reaching anterior part of abdominal tergite V. Metanotum without spines; 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; tergites I–VIII without spines; tergite IX with a pair of spines on posterolateral angles.

Remarks. Physatocheila nigrintegerrima resembles P. distinguenda in general appearance but can be easily distinguished by following characteristics: general color black ( Figs. 8H , 9G , 10G , 11G ); a pair of frontal spines on head reaching behind tip of clypeus; median spine on head reaching level far remote from bases of frontal spines; a pair of occipital spines on head reaching middle of compound eyes; rostrum reaching middle part of metasternum; and costal area slightly narrower than subcostal area at widest part.

Distribution. Japan (Honshu).

Host plant. Japanese raisin tree, Hovenia dulcis Thunb. (Rhamnaceae) ( Maehara 2019; Souma 2019; Yazaki 2019; Konno 2020).

Biology. A number of adults and nymphs of Physatocheila nigrintegerrima were collected from the flowers and fruits of the host tree Hovenia dulcis in July ( Maehara 2019; Souma 2019; Yazaki 2019). In the field, individuals of this species were observed assembling on the fruits of Ho. dulcis in July ( Fig. 14B, 14C ) and sprouts of Ho. dulcis in May ( Konno 2020).

Adults were observed from March to August, and nymphs were collected in July ( Maehara 2019; Souma 2019; Yazaki 2019; Konno 2020; present study). The overwintering stage remains unknown.

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 14. A living fifth instar nymph of Physatocheila nigrintegerrima (A) from Tochigi, Honshu, Japan (photograph taken indoors). Feeding habitat of P. nigrintegerrima adults (B, C) on the host plant (Hovenia dulcis Thunb.) at Tochigi, Honshu, Japan (photographed in the field).

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.