Anthocorini, Fieber, 1836

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 : 378

Key to the genera of Anthocorini occurring in Japan

1. Metasternum apically truncate or weakly rounded; metacoxae widely separated from each other. ......... 2

– Metasternum apically triangular; metacoxae contiguous with each other. ................................................. 3

2. Labium usually extending to mesocoxae ( Fig. 1B ); lateral margin of pronotum notched at the border of collar and callus ( Figs 1A,C ); ostiolar peritreme protruding, directed transversely toward the outer margin of metapleuron and almost truncated or obtuse at its apex ( Figs 2A–B ). ......... Temnostethus Fieber, 1860

– Labium reaching or barely exceeding procoxae ( Fig. 1F ); lateral margin of pronotum straight ( Fig. 1E ); ostiolar peritreme subplanate, directed obliquely toward the outer margin of metapleuron and gently acute at its apex ( Fig. 2C ). ............. Elatophilus Reuter, 1884

3. Hemelytra impunctate or shallowly punctate; abdominal sternum with a pair of membranous areas on segments II–III ( Fig. 12 ). ... Anthocoris Fallén, 1814

– Hemelytra densely covered with setigerous punctures; abdominal sternum without membranous area.. ....... 4

4. Ostiolar peritreme protruding slightly at the apex but not prolonged tongue-like, its apex continued by a fine carina ( Fig. 5A ). ...... Acompocoris Reuter, 1875

– Ostiolar peritreme apically projected, tongue-like and protruding above the surface of evaporatorium, its apex not continued by a fine carina ( Fig. 5D ). ........... ............................................ Tetraphleps Fieber, 1860

Figures

Fig. 1. Habitus, dorsal (A, C, E) and lateral (B, D, F) views. A–B – Temnostethus distans Kerzhner, 1973, female; C–D – T. mirificus sp. nov., holotype, male; E–F – Elatophilus nipponensis Hiura, 1966, male. Scale bars: 1.0 mm.

Fig. 2. Scanning electron micrographs of diagnostic characters of Japanese anthocorids. A – Temnostethus distans Kerzhner, 1973, female; B, D – T. mirificus sp. nov., female (B) and male (D), paratypes; C – Elatophilus nipponensis Hiura, 1966, female. A–C – ostiolar peritreme and evaporatorium, left lateroventral view; D – pygophore with paramere, lateral view. Abbreviations: eva ‒ evaporatorium; mf ‒ median furrow; op ‒ ostiolar peritreme; prm ‒ paramere; pyg ‒ pygophore.

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. 5. Scanning electron micrographs of diagnostic characters of Japanese anthocorids. A–C – Acompocoris brevirostris Kerzhner, 1979, female (A) and male (B–C); D–F – Tetraphleps aterrima (J. Sahlberg, 1878), male.A, D – ostiolar peritreme and evaporatorium, left lateroventral view; B, E – pygophore with paramere, dorsal view; C, F – paramere, dorsal views. Abbreviations: eva ‒ evaporatorium; mf ‒ median furrow; op ‒ ostiolar peritreme; prm ‒ paramere; pyg ‒ pygophore.