Eurygaster Laporte, 1833

Neimorovets, Vladimir, 2020, Review of the genus Eurygaster (Hemiptera: Heteroptera: Scutelleridae) of Russia, Zootaxa 4722 (6), pp. 501-539 : 505

Genus Eurygaster Laporte, 1833

Eurygaster Laporte, 1833: 68 . Type species by subsequent designation ( Anonymous, 1838: 295): Cimex hottentotta Fabricius, 1775 .

Description. Body wide oval, moderately convex, without vestiture, with dense black, brown or pale punctures. Abdominal punctures small, hardly visible. Dorsum usually brownish to pale yellow, rarely grey, varying from pale to very dark, with more or less distinct marble-like pattern ( Figs. 56–104 , 108 ).

Melanist forms occur among specimens of E. austriaca , E. integriceps , E. maura , and E. testudinaria ( Figs. 61 , 74 , 83 and 90 ). Studied material of E. dilaticollis and E. laeviuscula did not include black specimens ( Figs. 62–65 ).

Head large, more or less triangular when viewed from above, pointed or rounded apically and slightly tilted down ( Figs. 13–25 ). Head 1.5–2.7 times as wide as long. Mandibular plates same length with clypeus ( E. integriceps , E. maura and E. dilaticollis ) or slightly extended ( E. testudinaria , Fig. 25 ). Mandibular plates in E. austriaca and E. laeviuscula , longer than clypeus and often closed in front of clypeus ( Figs. 19, 20 and 23 ). Lateral margins of mandibular plates straight or slightly convex. Antennae thin, second segment slightly curved.

Pronotum 2.1–2.7 times as wide as long. Anterolateral margins of pronotum prominently convex, straight or slightly concave. Anterior lobes of prothorax broad, extending forward and covering base of antennae. Scutellum tongue-shaped with straight parallel lateral margins, covering most of abdomen and extending beyond its tip. Visible part of corium narrow, with costal margin more or less widely concave at middle. Legs short, covered with short sharp setae. Tibiae shorter than respective femora.

Abdomen at widest point usually wider than pronotum, ventrally convex, dorso-ventrally flattened at sides. Connexivum mostly visible from above. Aedeagus with one to four pairs of conjunctival appendages. Crown of paramere divided into thorn and blade ( Fig. 11 ). Lateral edge of paramere more or less convex and covered with setae. Shape of conjunctival appendages ( Figs. 32–37 , 38–49 A–C), parameres ( Figs. 38–49 D–F) and postgenital segments of females ( Figs. 50–55 ) more or less vary within each studied species.

Figures

FIGURES 56–65. Species of Eurygaster. 55–65—E. austriaca (Schrank, 1776), the different variants of coloration: 56, 57 and 59—female, Russia, Voronezh Province: 60, 61—female, Russia, Belgorod Province. 62–63—E. dilaticollis Dohrn, 1860: 62—male, 63—female. 64–65—E. laeviuscula Jakovlev, 1886: 64—female, 65—male.

FIGURES 66–74. Eurygaster integriceps Puton, 1881, variability of coloration. 66, 68 and 73—female, Russia, Krasnodar Territory; 67, 69–72 and 74—male, Russia, Krasnodar Territory.

FIGURES 75–85. Eurygaster maura (Linnaeus, 1758), variability of coloration.75, 76 and 85—female, Russia, Altai Territory; 77, 79, 82 and 84—female, Russia, Omsk Province; 78, 80 and 81—male, Russia, Altai Territory; 83—male, Russia, Belgorod Province.

FIGURES 86–97. Eurygaster testudinaria (Geoffroy, 1785), variability of coloration. 86, 87—female, Russia, Krasnodar Territory; 88—male, Russia, Kostroma Province; 89—male, Russia, Irkutsk Province; 90—female, Russia, Irkutsk Province; 91—male, Ukraine, Zhytomyr Province; 92—male, Mongolia, Dornod Province; 93—male, China, Nanjing Province; 94, 95, 97—female, North Korea, Chagang Province; 96—male, North Korea, Chagang Province.

FIGURES 98–104. Eurygaster testudinaria (Geoffroy, 1785) from China. 98, 99—male, Jiangxi Province; 100—female, Jiangxi Province; 101, 103—female, Tibet Autonomous Region; 102—male, Tibet Autonomous Region; 104—female, Guizhou Province. © Photo by Laurent Fauvre.

FIGURES 105–111. Eurygaster sinicus Walker, 1867. 105—Holotype labels; 106—anterior view; 107—head, dorsal view; 108—body, dorsal view; 109–111—aedeagus: 109—dorsal view, 110—dorsolateral view, 111—left lateral view. © The Trustees of the Natural History Museum, London. Photography by Ken Merrifield and Mick Webb.

FIGURES 13–18. Head of Eurygaster, anterior view. 13—E. austriaca (Schrank, 1776), male; 14—E. dilaticollis Dohrn, 1860, female; 15—E. integriceps Puton, 1881, male; 16—E. laeviuscula Jakovlev, 1886, male; 17—E. maura (Linnaeus, 1758), male; 18—E. testudinaria (Geoffroy, 1785), female.

FIGURES 19–25. Head of Eurygaster, view from above. 19—E. austriaca (Schrank, 1776), male (apices of mandibular plates converge); 20—E. austriaca (Schrank, 1776), male (apices of mandibular plates don’t converge); 21—E. dilaticollis Dohrn, 1860, female; 22—E. integriceps Puton, 1881, male; 23—E. laeviuscula Jakovlev, 1886, male; 24—E. maura (Linnaeus, 1758), male; 25—E. testudinaria (Geoffroy, 1785), female.

FIGURES 11–12. The schemes of left paramere and female’s postgenital segments of E. integriceps. 11—left paramere (Alateral view, 11B—dorsal view, Cr—crown, th—thorn, bl—blade, le—lateral edge, St—stem); 12—female’s postgenital segments in posterior view (lt8, lt9—laterotergites VIII, IX; vf8—valvifer VIII).

FIGURES 32–37. Schemes of aedeagus of Eurygaster (A—dorsal view, B—dorsolateral view, C—left lateral view). 32—E. austriaca (Schrank, 1776); 33—E. dilaticollis Dohrn, 1860; 34—E. integriceps Puton, 1881; 35—E. laeviuscula Jakovlev, 1886; 36—E. maura (Linnaeus, 1758); 37—E. testudinaria (Geoffroy, 1785).

FIGURES 38–41. Male genitalia of Eurygaster (aedeagus: A—dorsal view, B—dorsolateral view, C—left lateral view; parameres: D—right paramere, E—left paramere, F—left paramere, dorsal view). view from abow. 38—E. austriaca (Schrank, 1776); 39—E. dilaticollis Dohrn, 1860; 40, 41—E. integriceps Puton, 1881.

FIGURES 42–45. Male genitalia of Eurygaster (aedeagus: A—dorsal view, B—dorsolateral view, C—left lateral view; parameres: D—right paramere, E—left paramere, F—left paramere, dorsal view). 42—E. laeviuscula Jakovlev, 1886 (holotype); 43—E. maura (Linnaeus, 1758); 44, 45—E. testudinaria (Geoffroy, 1785).

FIGURES 46–49. Male genitalia of Eurygaster testudinaria (Geoffroy, 1785) (aedeagus: A—dorsal view, B—dorsolateral view, C—left lateral view; parameres: D—right paramere, E—left paramere, F—left paramere, dorsal view). 46—Ukraine, Zhytomyr Province; 47—China, Gansu Province [Kansu nur]; 48—North Korea, Chagang Province; 49—Korea, [Kvonkzhen– Syasulma].

FIGURES 50–55. Female’s postgenital segments of Eurygaster. 50—E. austriaca (Schrank, 1776); 51—E. dilaticollis Dohrn, 1860; 52—E. integriceps Puton, 1881; 53—E. laeviuscula Jakovlev, 1886; 54—E. maura (Linnaeus, 1758); 55—E. testudinaria (Geoffroy, 1785).