Illustrated key to the genera included in the tribe Acanthocephalini (Hemiptera Heteroptera: Coreidae: Coreinae), with descriptions of three new genera, seven new species, new taxonomic rearrangements, and a key to genera of Placoscelini Author Brailovsky, Harry text Zootaxa 2021 2021-12-21 5082 5 457 475 journal article 2716 10.11646/zootaxa.5082.5.4 3fa676b0-872a-41c6-85ea-dacfab4e216a 1175-5326 5794957 D46E05BA-53A9-4284-984D-F85477D1998C Key to Genera of Acanthocephalini * 1. Hind tibiae simple or with tiny expansion.................................................................. 2 - Hind tibiae conspicuously expanded..................................................................... 10 2. Rostral segment IV longer than III; fore, mid, and hind femora in each sex with only one acute subapical spine; humeral angles almost obtuse, with only a tiny expansion ( Fig. 23 ).......................................... Leptopetalops Breddin - Rostral segment III longer than IV; fore, mid, and hind femora in each sex with one or two rows of acute or stout spines, and always with two large subapical spines; humeral angles expanded, each with a large spine directed outward and backward or with a medium size spine sometimes acute or rounded........................................................ 3 3. Scutellum wider than long; body nearly oval; supracoxal spine present in males; triangular process of pronotum absent or slightly projected ( Fig. 13 )................................................................. Laminiceps Costa - Scutellum longer than wide or dimensions subequal; body elongate; supracoxal spine present or absent in males; triangular process of pronotum visible or absent..................................................................... 4 4. Humeral angles obtuse, slightly angulate; supracoxal spine in males absent; body surface with bluish-green metallic reflections ( Fig. 19 )......................................................................... Ctenomelynthus Breddin - Humeral angles expanded, with a medium size to clearly elongate spine, acute, directed outward and backward; supracoxal spine in males present or absent; body surface with or without bluish-green reflections.............................. 5 5. Metapleural supracoxal spine in males present.............................................................. 6 - Metapleural supracoxal spine in males absent............................................................... 7 6. Rostral segment III longer than II; humeral angles conspicuously produced into sharp spines directed outward and slightly backward ( Figs. 21 , 33–36 )........................................................ Petalops Amyot & Serville - Rostral segment II longer than III; humeral angles produced into a medium size spine, directed outward and slightly backward ( Fig. 24 )................................................................................... Salapia Stål 7. Head and pronotum densely clothed with erect hairs; male hind femora without short, acute basal spine................. 8 - Head and pronotum glabrous or with few scattered hairs; male hind femora with short, acute basal spine................ 9 8. Antenna shorter than total body length; hind femora in both sexes moderately robust; hind tibiae in males with small spines, in females unarmed ( Fig. 14 ).......................................................... Cleotopetalops Brailovsky - Antennae longer than total body length; hind femora in both sexes conspicuously incrassate (slightly less in females); hind tibiae in males armed with one row of large and stout spines (unarmed in females) ( Figs. 4–5 )....... Antipetalops gen. nov. 9. Male hind acetabulae with large, broad, creamy yellow hardened protuberance; tylus in lateral view conspicuously expanded, resembling a foliate-shape; rostrum reaching to middle third of metasternum ( Figs. 7–9 ).......... Cryptopetalops gen. nov. - Male hind acetabulae without creamy yellow, hardened protuberance; tylus in lateral view not prominently projected, triangular; rostrum reaching posterior border of mesosternum ( Figs. 1–3 )............................. Anomalopetalops gen. nov. 10. Dorsal surface of male connexival segments V–VII covered with small acute to stout spines or tubercles, intermixed with large and robust expansion................................................................................. 11 - Male and female connexival segments V–VII without spines or tubercles along the upper surface..................... 13 11. Metathoracic scent gland opening with two fused auricles resembling an unilobed structure; mesopleuron without creamy yellow hardened spots; hind tibiae longer than the maximum length of abdomen; antennal segments IV longer than II and III together ( Figs. 18 , 22 )....................................................... Stenometapodus Breddin (in part) - Metathoracic scent gland auricle bilobate; mesopleuron with one or two creamy yellow hardened spots; hind tibiae longer or shorter than maximal length of abdomen; antennal segment IV longer or shorter than II and III together................ 12 12 Antennal segment IV longer than II and III together; hind tibiae longer than maximal length of abdomen; apex of scutellum globose with hardened prominent creamy yellow callosity; mesopleuron with one or two creamy yellow hardened callosities ( Fig. 11 )............................................................ Ichilocoris Brailovsky & Barrera (in part) - Antennal segment IV shorter than II and III together; hind tibiae shorter or subequal to the maximal length of abdomen; apex of scutellum creamy yellow to yellowish orange, slightly raised above scutellar disk; mesopleuron without one or two creamy yellow hardened callosities ( Fig. 15 ).................................. Cervantistellus Brailovsky & Barrera (in part) 13. Posterior angles of abdominal segments V and VI spined..................................................... 14 - Posterior angles of abdominal segments V and VI not spined.................................................. 19 14. Pronotal disc tuberculate, impunctate ( Fig. 16 ).................................................. Empedocles Stål - Pronotal disc punctate, without tubercles.................................................................. 15 15. Hind tibiae shorter than maximal length of abdomen; outer expansion of hind tibiae lanceolate....................... 16 - Hind tibiae longer than maximal length of abdomen; outer expansion of hind tibiae uniformly narrowed............... 17 16. Triangular process absent; scutellar disc lacking erect setae; anterior third of anterolateral margins of pronotum covered with small blunt spines close to frontal angles; mesopleuron without creamy yellow callosities; rostral segment IV subequal to III ( Fig. 20 )........................................................................ Meluchopetalops Breddin - Triangular process present; scutellar disc with erect setae; entire anterolateral margins of pronotum irregularly nodulose and with blunt spines; mesopleuron with one or two creamy yellow callosities; rostral segment IV shorter than III ( Fig. 15 ).................................................................... Cervantistellus Brailovsky & Barrera (in part) 17. Metathoracic scent gland opening with two fused auricles resembling an unilobed or single structure ( Figs. 18 , 22 ).................................................................................. Stenometapodus Breddin (in part) - Metathoracic scent gland auricle bilobate................................................................. 18 18. Triangular process present; mesopleuron with one or two creamy yellow hardened callosities ( Fig. 11 )...................................................................................... Ichilocoris Brailovsky & Barrera (in part) - Triangular process absent; mesopleuron without creamy yellow hardened callosities ( Fig. 6 )..... Zygometapodus Brailovsky 19. Outer expansion of hind tibiae straight, narrow, without spines; antennal segments II and III together shorter than IV ( Fig. 10 ).......................................................................................... Lucullia Stål - Outer expansion of hind tibiae not straight, wide, either sinuate or spinated; antennal segments II and III together longer than IV ................................................................................................ 20 20. Rostral segments III and IV together longer than II ( Fig. 17 )................................ Acanthocephala Laporte - Rostral segments III and IV together shorter than II ( Fig. 12 )......................................... Thymetus Stål