Cornonannus, Luo & Gong & Xie, 2022

Luo, Jiu-Yang, Gong, Qiang-Bang & Xie, Qiang, 2022, A new genus and species of minute litter bugs family Schizopteridae Reuter, 1891 from China (Hemiptera, Heteroptera, Dipsocoromorpha), ZooKeys 1120, pp. 177-193 : 177

publication ID	https://dx.doi.org/10.3897/zookeys.1120.90086
publication LSID	lsid:zoobank.org:pub:E576A469-D336-4D82-AE48-7442B473D55C
persistent identifier	https://treatment.plazi.org/id/1AEACAED-23C0-4690-AB8E-5287B3E9E5D9
taxon LSID	lsid:zoobank.org:act:1AEACAED-23C0-4690-AB8E-5287B3E9E5D9
treatment provided by	ZooKeys by Pensoft
scientific name	Cornonannus
status	gen. nov.

Treatment

Genus Cornonannus gen. nov.

Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figure 9

Type species.

Type species by present designation: Cornonannus bui sp. nov.

Diagnosis.

The genus Cornonannus gen. nov. can be distinguished from the other genera of Schizopterinae by the following combined characteristics: 1) male with an upcurved horn-like frontal process on middle of head (Figs 1A-D View Figure 1 , 2A-C View Figure 2 ); 2) pronotum without collar; 3) forewing without costal fracture (Fig. 3A View Figure 3 ); 4) forewing C+Sc, R1 distinctly thicker than other veins, R2 broad, about 2-3 times width of M, Cu or apical half of An (Fig. 3A View Figure 3 ); 5) tarsal formula 3-3-3 (Fig. 3C-E View Figure 3 ); 6) tergites I-VII of abdomen with transverse groove, tubercles on both sides of groove respectively or only on posterior side of groove (Fig. 4B, C View Figure 4 ); 7) male anophoric process large and curved (Fig. 4B, C View Figure 4 ).

Description.

Small (ca 1.5-1.6 mm), oblong and stout, forewing exceeding apex of abdomen (Fig. 1A-D View Figure 1 ). Coloration: ground color brown to dark brown, compound eyes red to dark red, appendages yellowish brown to light brown, subapical of forewings with whitish area (Fig. 1A, D View Figure 1 ).

Structure: head strongly declivent, short in lateral view, with dense punctures; frons slightly convex, with frontal process in the middle (Figs 2A, C View Figure 2 , 5A, C View Figure 5 ), and several frontal cibarial muscle scars; vertex with cibarial scars consists of five contiguous coarse pits arranged in a row on both sides (Fig. 2A View Figure 2 ); areas near inner margin of eyes convex; maxillary plate and buccula with semi-erect, long setae, clypeus with three pairs of semi-erect setae, and one central long seta; labrum with one pair of long setae, labial segment IV with two pairs of long setae (Figs 2A, B View Figure 2 , 5C, E View Figure 5 ). Compound eye with about 30 ommatidia. Ocelli small, near inner margin of eyes, as large as about two ommatidia (Figs 2A, B View Figure 2 , 5B View Figure 5 ). Antennae four-segmented, antennal segments I and II stout, subequal in length, with several semi-erect setae (Fig. 2A-C View Figure 2 ); segments III and IV slender, segment IV longer than III, both segments with very long, semi-erect setae (Fig. 1A-C View Figure 1 ). Labium four-segmented, reaching to middle of mesosternum, segment I thickest, segment IV longest and tapering (Fig. 1A, B View Figure 1 ). Thorax: prothorax with relatively dense punctures as in head (Figs 2A, B View Figure 2 , 5C-D View Figure 5 ). Pronotum near trapezoidal, declivent, without collar; callosite region with muscle scars consist by several pits (Fig. 2A View Figure 2 ); disk region convex; lateral margin sinuate, posterior margin slightly convex, middle near straight; proepisternal lobe inflated, almost reaching antennal insertions in lateral view (Fig. 2B View Figure 2 ). Proepimeral lobe wider than proepisternal lobe, subrectangular, posterior margin of proepimeron sinuate (Fig. 2B View Figure 2 ). Prosternum with wide longitudinal middle groove, apical portion of prosternal xiphus bilobate, sternal plate of prothorax trapezoidal, with straight posterior margin (Fig. 2C View Figure 2 ). Mesoscutum large; apex of mesoscutellum projecting posterodorsally in lateral view, base of mesoscutellum with a pair of pits (Fig. 2D-F View Figure 2 ); axillary cord sinuated; mesopostnotum with dense tubercles (Fig. 2E, F View Figure 2 ); mesoepisternal lobe large, mesepimeral lobe narrow, with tongue-shaped apex; upper area of mesopleura with a caudally directed triangular process (Fig. 2 D-F View Figure 2 ), mesopleura with groove along with middle coxal cleft, a deep concave located near the middle (Figs 2F View Figure 2 , 5F View Figure 5 ); mesosternum with longitudinal mesosternal ridge (Fig. 2F View Figure 2 ). Metascutum transverse, curved; metapostnotum transverse; a deep groove between mesopleura and metapleural (Figs 2F View Figure 2 , 5F View Figure 5 ). Metasternum with large keel-like metasternal spine, interlocking with notch between middle coxal cavities, basal portion of metasternal spine with round process, triangular apex (Figs 2F View Figure 2 , 6A View Figure 6 ); apex of metendosternite bilobate (Fig. 2D-E View Figure 2 ). Forewings macropterous in males, female unknown; C+Sc and R thickened, with very narrow, slender subcostal cell; R2 distinctly wider than other veins; basal cell and trapezoidal discal cell slender; end of M subdivided into two branches (Fig. 3A View Figure 3 ). Hind wings large and subdivided into four lobes, jugal lobe small; Sc+R+M and Cu subequal in length, 1An about three times as long as 2An, m-cu absent, (Fig. 3B View Figure 3 ). Tarsal formula 3-3-3; apex of coxae, whole trochanters, femurs, tibiae, and tarsi with semi-erect setae (Fig. 3C-E View Figure 3 ). Arolia absent; pulvilli fine and straight. Inner apex of foretibiae protuberant, with a long seta (Fig. 5E View Figure 5 ); foretibiae bristle comb with about 10 setae; middle tibiae bristle comb with about 10 setae. Inner surface of hind coxae with adhesive pad (Figs 3E View Figure 3 , 6A, B View Figure 6 ); distal half of hind tibiae slightly curved, apex of hind tibiae with four thick setae. Pregenital abdomen: abdomen strong sclerotized and rigid; terga interlocking, sterna also interlocking; tergites I-VI, sternites II-VI almost symmetric, tergite VII, sternite VII slightly asymmetric, tergite VIII strongly asymmetric (Fig. 4A-C View Figure 4 ). Tergites I and II fused, with transverse groove in the middle, tubercles on both sides of groove respectively or only on posterior side of groove (Figs 4B, C View Figure 4 , 7A, B View Figure 7 ). Middle area of sternites II and III less sclerotized, as sockets interlocking with metasternal plate; middle of sternite IV with longitudinal ridge; posterior margin of sternites VI and VII sinuated; sternite VII showing distinct sinistral asymmetry, sternites on both sides are approximately 90° from caudal view (Fig. 4D View Figure 4 ). Tergite VIII also showing sinistral asymmetry. Genitalia: basal portion of pygophore near globular, overlapped by tergite VIII and sternite VII in repose; apical portion of pygophore flat, and exposed, with dense setae, asymmetrical. Anophore tubular, with anophoric process. Parameres strongly asymmetry; left paramere short, with a broad base, and a curved flattened distal projection; right paramere long, tapering, with a flat oval base provided with inner curved distal projection. Aedeagus complex, with a large, triangular basal plate; apical portion tubular, thin.

Etymology.

The generic name is derived from the Greek prefix “corn-” (horned or having horns or horn-like appendages) and the Greek root “nannus” (a dwarf). The gender is masculine.