Kokeshia Miyamoto, 1960

Luo, Jiu-Yang & Xie, Qiang, 2022, Taxonomic review of Kokeshia Miyamoto, 1960 from China, with description of ten new species (Hemiptera: Heteroptera: Schizopteridae), European Journal of Taxonomy 802, pp. 1-57 : 3-5

Genus Kokeshia Miyamoto, 1960

Kokeshia Miyamoto, 1960: 163 .

Type species

Kokeshia esakii Miyamoto, 1960 by original designation.

Diagnosis

The genus Kokeshia can be recognized among Schizopterinae (including the former ʻOgeriinaeʼ) by the following combination of characters: (a) labium short, four-segmented; (b) tarsal formula 2–2–3; (c) forewing with costal fracture, C+Sc, R+M and R prominently thicker than other veins, medial fracture very short, subcostal cell elongated triangular, trapezoidal cell with five emanating veins, free distal remigial veins usually with a fused apical portion, and terminate before wing margin; (d) male abdominal tergite VII and sternite VII slightly asymmetrical, tergite VIII usually subdivided into two parts, and left hemitergite VIII usually with process; (e) apical portion of phallus sclerotized, tubular and coiled. The venation of forewing is similar to genus Caucanannus Weirauch et al., 2020 and Guapinannus Wygodzinsky, 1951 in welling-developed costal fracture; prominently thick C+Sc, R+M and R; R with only one branch; abdomen of male well sclerotized, and near symmetrical, with well-developed tergites, but it can be distinguished from the latter two genus by M normal, without wing organ or gland; free distal remigial veins usually with a fused apical portion, and terminate before wing margin, instead of reaching to wing margin.

Redescription

BODY. Body small (about 1.07‒1.49 mm), suboval ( Fig. 1A‒C ). Only macropterous male and brachypterous female reported up to now (hind wings absent in female).

COLORATION. Body color relatively uniform, light brown to brown; antennae, labium and legs yellowish brown ( Fig. 1A‒C ).

SURFACE AND VESTITURE. Cuticle matt; head, thorax, veins of forewing, and abdomen with relatively dense, short, and adpressed setae. Anteclypeus with long setae; antennal segments I and II with short curved setae, segments III and IV with very long semi-erect to erect setae. Legs with relatively long, rather dense semi-erect setae.

HEAD. Head short and vertical, wider than long in frontal view. Eyes small, wide of eye about ⅛ × as wide as head in frontal view, raspberry appearance; ocelli present in macropterous male and absent in brachypterous female, located on anterior portion of fronto-vertex close to eyes in male. Labium short, 4-segmented, reaching to middle coxae, segment I stoutest, segments II and III subequal in length and diameter, segment IV longest and tapering to tip. Antennal segments I and II thick and short, subequal in length; segments III and IV slender, subequal in length as well.

THORAX. Pronotum of male broad, near trapezoid, about 3 /5 × as long as wide, with distinct collar; collar short and broad, about 1 /6 × as long as pronotum, middle part of posterior margin concave. Pronotum of female smaller than male, posterior margin slightly arc-shaped concave. Scutellum small, with small tongue-shaped apex, two small pits located in middle area near base. Tarsal formula in both sexes is 2–2–3. Metasternum with high, rounded central process ( Fig. 1C ). Forewings of male exceed apex of abdomen, costal fracture distinct. Venation unique, C+Sc, R+M and R prominently thicker than other veins, medial fracture very short, subcostal cell elongated triangular, trapezoidal cell with five emanating veins, free distal remigial veins usually with fused apical portion, and terminate before wing margin; subcostal cell triangular and elongate, with elongate quadrangular basal and elongate pentagonal discal cell ( Fig. 1A ). Forewings of female short, surpassing posterior margin of tergite IV ( K. esakii Miyamoto, 1960 ) to reaching tergite VII ( K. martensi Štys, 1985 , K. similis Štys, 1985 and K. stysi Rédei, 2008 ).

ABDOMEN. Pregenital abdomen strongly sclerotized, tergites I and II fused together, can be distinguished by a transverse groove; sternite I absent, sternites II and III fused, boundary could not be recognized ( Fig. 1D ). Tergite VII of male large, slightly asymmetrical, sternite VII large, almost symmetric to slightly asymmetrical, forming a bowl-shaped subgenital plate. Sternite VIII of male probably absent, invisible in appearance, tergite VIII of male in all except K. acutiformis sp. nov. subdivide into two asymmetrical hemitergites, left hemitergite usually with process in different shapes and size (key diagnostic character for species identification) ( Figs 1 D−G, 2A−B).

GENITALIA. Pygophore asymmetrical, dorsally separated in appearance. Parameres strongly asymmetrical, distal projection of both left and right paramere elongate and flattened, but left paramere usually with angulate projection at base ( Fig. 2 D−G). Phallus with large basal process, apical portion sclerotized, tubular and coiled ( Fig. 1 D−E). Segment X asymmetrical, ring-shaped, segment XI membranous. Genitalia of female simple, tergite VIII and IX strongly sclerotized, visible in dorsal view, sternite IX with sclerotized intervalvular membrane.

Figures

Fig. 1. Kokeshia acutiformis sp. nov. A‒C. Habitus, holotype, ♂ (SYSBM). A. Dorsal view. B. Lateral view. C. Ventral view. D. Pregenital abdomen and genitalia, dorsal view, paratype, ♂ (SYSBM). E‒G. Scanning electron micrographs of genitalia, paratype, ♂ (SYSBM). E. Dorsal view. F. Right side, dorsal view. G. Left side, dorsal view. Abbreviations: see Material and methods.

Fig. 2. Kokeshia acutiformis sp. nov., segment VIII and genitalia, paratype, ♂ (SYSBM). A‒B. Left hemitergite VIII. A. Dorsal view. B. Right lateral view. C. Phallus. D‒E. Left paramere, two different aspects. F‒G. Right paramere, two different aspects.