Anthocoris takahashii Hiura, 1959

Yamada, Kazutaka & Yasunaga, Tomohide, 2021, The tribe Anthocorini in Japan (Hemiptera: Anthocoridae): descriptions of new species, review of distribution and bionomics, Acta Entomologica Musei Nationalis Pragae 61 (2), pp. 375-426 : 403-404

Anthocoris takahashii Hiura, 1959

( Figs 7K–L , 9E , 12E , 13M–O , 15E , 16E , 21 )

Anthocoris takahashii Hiura, 1959: 6 . Holotype: J, Japan, Hokkaido, Ashoro (OMNH).

Anthocoris takahashii : Fඈඋൽ (1979): 56 (listed, distribution); KൾඋඓHඇൾඋ (1988): 773–774 (figures, in key); Mංඒൺආඈඍඈ & YൺඌඎඇൺGൺ (1989): 165 (listed, distribution); Pඣඋංർൺඋඍ (1996): 115 (catalogue, distribution); Iංඃංආൺ (1997): 15 (record); Bඎ & ZHൾඇG (2001): 120, 162 (in key, figures, redescription); YൺඌඎඇൺGൺ (2001a): 231 (listed, habitat); YൺඌඎඇൺGൺ (2001b): pl. 85, 282 (photo, diagnosis, habitat,phenology); KൺඇඒඎKඈඏൺ & MൺඋඎඌංK (2006): 168 (record); Kൾ & Bඎ (2007): 92–93 (figure, description of female genitalia); MൺൾHൺඋൺ (2009): 65 (record, distribution, photo); VංඇඈKඎඋඈඏ et al. (2010): 58 (catalogue, distribution); Kඈඇඇඈ (2012b): 32 (record, photo, associated plant); MൺൾHൺඋൺ (2012): 35 (record, associated plant, distribution); Hൺඈ & Mൺ (2013): 36 (listed); Kඈආൺඍඌඎ & NൺGൺං (2014):43 (record, habitat,

photo); MൺൾHൺඋൺ (2015): 29 (record, distribution, habitat); Kඈආൺඍඌඎ (2016):97 (listed);Yൺආൺൽൺ et al.(2016):422 (catalogue, distribution). Type material examined. Hඈඅඈඍඒඉൾ: J, ‘ASHORO \ HOKKAIDO \ 28. V. 1957 \ M. TAKAHASHI’ [handwritten], ‘ HOLOTYPE J [handwritten] \ Anthocoris [handwritten] \ takahashii [handwritten] \ HIURA, 1959 [handwritten] \ I. HIURA Det. [printed]’, ‘OMNH TI 191’ [handwritten] ( OMNH).

Additional material examined. JAPAN: HඈKKൺංൽඈ: 1 J, Horokanai-cho, Uen-nai Dam, 20.viii.2000, T. Yasunaga ( TYCN); 1 ♀, Kamikawa-cho, Aizankei, 19.vii.1962, Y. Miyatake ( ELKU); 2 JJ (one in Figs 7K–L ), Asahikawa-shi, Kasuga near Mt. Inoh, 19.vii.1998, T. Yasunaga ( TKPM); 1 ♀, Kamishihoro-cho, Nukabira, 23.vii.1959, K. Morimoto ( ELKU); 1 ♀, Tobetsu-cho, Yon-ban-gawa Riv., 13.vi.1997, S. Yamashita ( TYCN); 2 JJ 1 ♀, same locality, 15.vii.1997, T. Akiba ( TKPM); 1 J ( Figs 12E , 13M–O ) 3 ♀♀ (one in Fig. 9E , one in Fig. 15E ), same locality, 15.vii.1997, A. Hiranuma ( TKPM); 1 ♀, Otaru-shi, Katsuraoka, 14.viii.2005, A. Yamamoto ( TKPM); 1 J, Otaru-shi, Asari Pass, 20.vi.1996, H.Maeda (TKPM) ; 1J, Otaru-shi,Okusawa-Suigenchi, 31.v.1995, M.Ôhara ( TKPM).Rishiri-tô Is.; 1♀, Hime-numa, 18.ix.1991, M. Tomokuni ( NSMT). HඈඇඌHඎ: Tochigi Pref.: 2 ♀♀, Nikko-shi, Nakamiyori, 17.v.2010, S. Maehara ( TKPM); 1 ♀, Nikko-shi, Yumoto, 1.viii.2006, S. Maehara ( TKPM). Niigata Pref.: 1 ♀, Yuzawa-machi, Asakai, 18.vi.1957, K. Baba ( ELKU). Nagano Pref.: 1 ♀, Karuizawa, 3.–7.viii.1959, S. Miyamoto ( ELKU).

Differential diagnosis. Recognized by the following combination of characters: body ( Figs 7K–L , 16E ) generally black; antennae ( Figs 7K–L ) blackish brown; labium ( Fig. 7L ) just reaching to procoxae; hemelytra ( Fig. 7K ) black, sometimes with brownish tinge on anterior half; membrane ( Fig. 7K ) smoky dark brown, with basal and innermost portions and area behind apex of cuneus whitish, large and irregularly shaped markings; legs ( Fig. 7L ) reddish brown to blackish brown, tibiae sometimes yellowish brown; ostiolar peritreme ( Fig. 9E ) straight, slightly narrowed at middle, obtuse at apex and slightly curved forward; abdominal sternum II ( Fig. 12E ) with a pair of small triangular membranous areas along posterior margin.A similar general appearance to eastern Palaearctic A. ussuriensis Lindberg, 1927 , but distinguished from that species by the uniformly blackish-brown antennal segment II (in A. ussuriensis , basal half of segment II yellowish brown), slightly brownish on anterior half of hemelytra (in A. ussuriensis , rather paler on anterior half of hemelytra), and copulatory tube fused on upper surface of intersegmental membrane between sterna VII and VIII, slightly to left of the middle of the membrane (in A. ussuriensis , fused on middle of intersegmental membrane).

Redescription. Male genitalia ( Figs 13M–O ): Pygophore ( Fig. 13M ) turbinate, longer than wide, covered with 8–12 long, stout setae intermixed with short, suberect setae along outer margin and on posteroventral surface, of which the longest is approximately half the length of pygophore; mid-dorsal surface very hirsute with short, suberect setae; paramere ( Figs 13N–O ) sickle-shaped, sub-basally widened, with several short setae on median portion; longitudinal groove lacking.

Female genitalia ( Fig. 15E ): Copulatory tube fused slightly left of middle on upper surface of intersegmental membrane between sterna VII and VIII, approximately 0.6–0.7 mm in length, basal 1/3 thickened, very thin and almost same width on apical 2/3; trunk of conductive tissue visible.

Measurements [mm; JJ (n = 5) / ♀♀ (n = 10)]. Body length 4.60–5.25 / 4.70–5.35; head length (excl. neck) 0.56–0.60 / 0.54–0.63; head width across eyes 0.64–0.70 / 0.63–0.69; vertex width 0.33–0.36 / 0.34–0.38; length of antennal segments I – 0.19–0.21 / 0.19–0.23, II – 0.54–0.65 / 0.53–0.60, III – 0.36–0.38 / 0.35–0.38, and IV – 0.39–0.44 / 0.38–0.44; length of labial segments II – 0.18–0.20 / 0.16–0.20, III – 0.58–0.63 / 0.58–0.65, and IV – 0.35–0.40 / 0.38–0.43; anterior pronotal width 0.53–0.58 / 0.54–0.58; mesal pronotal length 0.66–0.76 / 0.70–0.81; basal pronotal width 1.43–1.60 / 1.50–1.75; length of embolial margin 1.54–1.78 / 1.63–1.85; length of cuneal margin 0.86–0.95 / 0.83–0.96; maximum width across hemelytra 1.55–1.78 / 1.63–1.88.

Bionomics. Anthocoris takahashii has been collected from Alnus spp. (Betulaceae) and Ulmus davidiana Planch. var. japonica (Rehder) Nakai (Ulmaceae) (YൺඌඎඇൺGൺ 2001a,b; Kඈඇඇඈ 2012b; MൺൾHൺඋൺ 2015). This species feeds on psyllids (Bඎ & ZHൾඇG 2001).

Distribution. Japan: Hokkaido (Hංඎඋൺ 1959), Rishiri-tô Is.*; Honshu: Yamagata (Kඈඇඇඈ 2012b), Tochigi (MൺൾHൺ- උൺ 2009), Niigata *, Nagano *; Kyushu: Miyazaki (Kඈආൺඍ- ඌඎ & NൺGൺං 2014). Chishima (Kuril) Islands: Kunashir Is. (KൾඋඓHඇൾඋ 1988, KൺඇඒඎKඈඏൺ & MൺඋඎඌංK 2006). Russia: Far East: Sakhalin (KൾඋඓHඇൾඋ 1988, VංඇඈKඎඋඈඏ et al. 2010). China: Guizhou, Zhejiang (Bඎ & ZHൾඇG 2001). This species is distributed mainly in Hokkaido and the Russian Far East, with scattered records from northern Honshu and Kyushu in Japan, and China ( Fig. 21 ).

Figures

Fig. 7. Habitus of Anthocoris spp., dorsal (A, C, E, G, I, K) and lateral (B, D, F, H, J, L) views. A–B – A. chibi Hiura, 1959, male; C–D – A. confusus Reuter, 1884, male; E–F – A. japonicus Poppius, 1909, male; G–H – A. kalopanacis Kerzhner, 1977, female; I–J – A. nemoralis (Fabricius, 1794), male; K–L – A. takahashii Hiura, 1959, male. Scale bars: 1.0 mm.

Fig. 9. Scanning electron micrographs of ostiolar peritreme and evaporatorium of Anthocoris spp, left lateroventral view. A – A. chibi Hiura, 1959, female; B – A. confusus Reuter, 1884, male (from India); C – A. japonicus Poppius, 1909, female; D – A. kalopanacis Kerzhner, 1977, female; E – A. takahashii Hiura, 1959, female; F – A. miyamotoi Hiura, 1959, female; G – A. venustus sp. nov., paratype, male. Abbreviations: eva ‒ evaporatorium; mf ‒ median furrow; op ‒ ostiolar peritreme; sca ‒ supracoxal area.

Fig. 12. Abdominal sterna II–III of Anthocoris spp., male, ventral view (setae omitted). A – A. chibi Hiura, 1959; B – A. confusus Reuter, 1884; C – A. japonicus Poppius, 1909; D – A. nemoralis (Fabricius, 1794); E – A. takahashii Hiura, 1959; F – A. miyamotoi Hiura, 1959; G – A. venustus sp. nov., paratype. Abbreviations: ma ‒ membranous area; st2–3 ‒ abdominal sternum II to III. Scale bars: 0.2 mm.

Fig. 13. Male genitalia of Anthocoris spp. A–C – A. chibi Hiura, 1959; D–F – A. confusus Reuter, 1884; G–I – A. japonicus Poppius, 1909; J–L – A. nemoralis (Fabricius, 1794); M–O – A. takahashii Hiura, 1959. A, D, G, J, M – pygophore with paramere (ejaculatory bulb omitted), dorsal view; B–C, E–F, H–I, K–L, N–O – paramere, two different views. Abbreviations: prm ‒ paramere; pyg ‒ pygophore. Scale bars: 0.1 mm.

Fig. 15. Female genitalia of Anthocoris spp., dorsal view.A – A. chibi Hiura, 1959; B – A. confusus Reuter, 1884; C – A. japonicus Poppius, 1909; D – A. nemoralis (Fabricius,1794); E – A.takahashii Hiura, 1959; F – A. miyamotoi Hiura, 1959; G – A. venustus sp. nov., paratype.Abbreviations: ct ‒ copulatory tube; ism ‒ intersegmental membrane; sp ‒ sperm pouch; t ‒ trunk of conductive tissue (C–D, trunk of conductive tissue dissolved). Scale bars: 0.1 mm.

Fig. 16. Habitus images of living individuals of Japanese Anthocorini spp. A – Acompocoris brevirostris Kerzhner, 1979, male; B – same, female; C – Tetraphleps aterrima (J. Sahlberg, 1878); D – Anthocoris confusus Reuter, 1884; E – A. takahashii Hiura, 1959; F – A. venustus sp. nov. (courtesy of M. Takai).

Fig. 21. Distribution of Anthocoris takahashii Hiura, 1959 (circles), A. japonicus Poppius, 1909 (triangles), and A. kalopanacis Kerzhner, 1977 (squares) in Japan. Filled symbols represent records based on specimens examined by us, open symbols represent literature records.