Cornicola mizuki, Ohara & Hayashi, 2022

Ohara, Naomichi & Hayashi, Masami, 2022, Recognition of the genera Igutettix Matsumura and Vilbasteana Anufriev (Hemiptera: Cicadellidae: Typhlocybinae), with discovery of a new related genus from Japan, Zootaxa 5125 (1), pp. 63-74 : 71-73

Cornicola mizuki sp. nov.

( Figs. 5–8 , 11, 12 , 17, 18 , 24–30 , 39–42 )

Body pale yellow to ivory white, and somewhat darkened in males. Head with pair of small black patches, tinged with reddish in dorsal mid-line and antero-laterally in males; face fuscous to black in ventral half in males, brownish to fuscous in lateral margin of frontoclypeus, gena situated between eye and frontoclypeus, and usually anteclypeus and lorum entirely in females. Pronotum with pair of antero-lateral spots fuscous; mesonotum fuscous apically; venter of thorax entirely in males and venter of mesothorax in females fuscous; leg pale yellow with claw dark brown and with male hind femur fuscous. Fore wing semitransparent, with veins dark yellow in males and pale yellow in females; hind wing semitransparent, with veins dark brown in males. Abdomen fuscous with genitalia pale yellow, and subgenital plate fuscous centrally in males, while pale yellow tinged with fuscous dorsally in most of 3 rd ‒6 th tergites and central part of 7 th ‒9 th tergites, with ovipositor fuscous in females.

Head 0.8 times as wide as pronotum; vertex 2.6–3.1 times as wide as dorsal midline, 1.0–1.3 times as long as next to eye, 0.2 times as long as pronotum. Pronotum 1.5 times as wide as long, 1.7–2.3 times as long as mesonotum. Male abdominal sternal apodemes reaching posterior margin of 5 th sternite; female 7 th sternite roundly rectangular, with posterior margin incised near middle, with lateral margin sinuate.

Body length (mean): ♂ 4.0– 4.3 mm (4.1 mm); ♀ 4.5–5.0 mm (4.8 mm).

Male genitalia. Subgenital plates slightly convex centrally, widened subbasally and gradually narrowed apicad. Aedeagus strongly bent dorsad, compressed dorsoapically, bearing 2 short spikes distally (occasionally absent); apical process slender, arched, extending laterally and strongly curved cephalad.

Female genitalia. First valvula of ovipositor with ventral margin narrowed subapically, with dorsal sculpture strigate in apical half. Second valvulae asymmetrical; right valvula with 8–10 strong teeth dorsally, which are small apically and at wider space basally; left one slightly serrated dorsally. Third valvula elongate with apex obtuse.

Type material. Holotype: ♂, Sugadaira (1,330 m), Ueda , Nagano Pref., 28. VII. 1995, M. Hayashi et al. ( ELKU) . Paratypes: [Hokkaido] 11♂ 5♀, Jôzankei, Minami-ku, Sapporo , 19. VII. 2012, H. Inoue leg. [ Honshu ] 8♀, Kashiwadai, Hachimantai , Iwate Pref., 21. VII. 2007 , M. Hayashi et al.; 5♂ 13♀, Sunakomi, Takizawa , Iwate Pref., 25. VI. 2014, S. Okudera leg.; 7♂ 3♀, Sagaekubo, Sagae , Yamagata Pref., 2. VII. 2005, S. Okudera leg. ; 1♂ 5♀, Tsuchiyusawa, Inawashiro , Fukushima Pref., 5. VIII. 2012 , K. Kogure et al.; 1♀, Asase, Yamakita, Tanzawa Mts. , Kanagawa Pref., 23. VI. 1994, M. Hayashi et al.; 25♀, Uchino (970 m), Oshino , Yamanashi Pref. 31. VII. 2019, M. Hayashi leg. ; 8♀, same data except 18. VIII. 2020 ; 32♀, same data as holotype except 1. IX. 1992 (light trap) ; 4♀, same data except 2. IX. 1992 ; 11♀, same data except 17. IX. 1993 ; 2♂ 2♀, same data except 25. VII. 1995 (light trap) ; 37♂ 36♀, same data as holotype ; 1♀, same data except 5. IX. 1996 ; 4♂ 35♀, same data except 8. VIII. 2005, M. Ozaki leg. ; 1♂ 2♀, Kannonzawa Valley, Shimosuwa , Nagano Pref., 17. VII. 2005, M. Ozaki leg. ; 5♀, Toyohira-Nagakura, Chino , Nagano Pref., 17. VIII. 2005, M. Ozaki leg. ; 1♀, Otonashi Rev., Kitayamakashiwabara, Chino , Nagano Pref., 17. VIII. 2005, M. Ozaki leg. ; 2♀, Miyagawa, Chino , Nagano Pref., 18. VIII. 2005, M. Ozaki leg. ; 3♂, Tamagawa, Chino , Nagano Pref., 16. VII. 2009, M. Ozaki leg. ; 1♂, Nakashinden, Hara , Nagano Pref., 16. VII. 2009, M. Ozaki leg. ; 1♂, Harayama, Hara , Nagano Pref., 6. VIII. 1995 , M. Hayashi et al.; 1♂, Yokomiyama, Hara , Nagano Pref., 7. VIII. 1995 , M. Hayashi et al.; 2♀, Fujimi, Fujimi , Nagano Pref., 17. VII. 2008, M. Ozaki leg. ; 2♂, Hirohara, Fujimi , Nagano Pref., 17. VII. 2008 , M. Hayashi et al.; 4♀, Osafuji-Kurosawa, Takatô, Ina , Nagano Pref., 18. VIII. 2005, M. Ozaki leg. ; 3♀, Fujisawa-Furuyashiki, Takatô, Ina , Nagano Pref., 18. VIII. 2005, M. Ozaki leg. ; 5♂ 6♀, Daitôhô, Kobuchisawa, Hokuto , Yamanashi Pref., 18. VII. 2008 , M. Hayashi et al.; 5♂, same data except 15. VII. 2009, M. Ozaki leg. [ Shikoku ] 8♂, Omogo Valley, Kumakôgen-chô , Ehime Pref., 17. VI. 2009, N. Ohara leg. All paratypes are deposited in ELKU .

Distribution. Japan (Hokkaido, Honshu, Shikoku).

Remarks. This species has hitherto been found mainly from East Japan, westward to Nagano Prefecture in central Honshu, and isolated in Shikoku of western Japan. Adults and nymphs are exclusively found on table dogwoods, Cornus controversa of Cornaceae , inhabit the lower surface of leaves, and adults occur from mid June to late September with a peak period during late July to early August.

Etymology. This species name is derived from the Japanese name of the host plant.

Figures

FIGURES 1–8. Habitus in dorsal and lateral views. — 1, 2, Igutettix pulverosus Matsumura sp. rev. (♂ 3.7 mm); 3, 4, Vilbasteana oculata (Lindberg) comb. rev. (♂ 4.5 mm); 5–8, Cornicola mizuki gen. et sp. nov. (5, 6, ♂ 4.2 mm; 7, 8, ♀ 4.7 mm).

FIGURES 9–12. Face in males (9–11) and female (12). — 9, Igutettix pulverosus Matsumura sp. rev.; 10, Vilbasteana oculata (Lindberg) comb. rev.; 11, 12, Cornicola mizuki gen. et sp. nov.

FIGURES 13–18. Fore and hind wings in males. — 13, 14, Igutettix pulverosus Matsumura sp. rev.; 15, 16, Vilbasteana oculata (Lindberg) comb. rev.; 17, 18, Cornicola mizuki gen. et sp. nov. Scale: 1.0 mm.

FIGURES 24–30. Male abdominal sternal apodemes (24) and ♂ genitalia (25–30) of Cornicola mizuki gen. et sp. nov. — 25, Genital capsule in lateral view; 26, subgenital plate in ventral view; 27, 28, style and connective in lateral (27) and dorsal (28) views; 29, 30, aedeagus in lateral (29) and caudal (30) views. Scales: 0.15 mm (29, 30), 0.4 mm (24–28).

FIGURES 31–42. Female 7th abdominal sternite and apex of ovipositor (1st, 2nd and 3rd valvulae) of Igutettix pulverosus Matsumura sp. rev. (31–34), Vilbasteana oculata (Lindberg) comb. rev. (35–38) and Cornicola mizuki gen. et sp. nov. (39–42). — 31, 35, 39, Abdominal sternite in ventral view; 32, 36, 40, 1st valvula of right side in lateral view; 33, 37, 41, 2nd valvulae of right side in lateral view; 34, 38, 42, 3rd valvula of right side in lateral view. Scales: 0.3 mm.