Guapinannus robustus Frankenberg & Knyshov & Hoey-Chamberlain & Weirauch 2021, sp. n

Guapinannus robustus, sp. n. (Figs 3, 7, 9) Holotype. Male. MEXICO: Chiapas: RSV A El Triunfo, Est. El Triunfo, 16.20286°N 91.86044°W, 1950 m, 08 Aug 1996 – 11 Aug 1996, A. R. Gillogly, 1♂ (UCR _ ENT 00094282) (UCR). Etymology: Named for the extremely thick vesica after “robustus” Latin for robust. Diagnosis: Recognized by the mid-sized body length (1.49 mm), small vein-tracing areoles distributed along scc, rc and rc1 (black arrow) (Fig. 3), slight extensions of the right pygophore margin (black star), and very thick vesica with blunt tip (Fig. 7). Description: Male: Total body length 1.49 mm; length from posterior margin of pronotum to posterior wing margin 1.1 mm; greatest width across pronotum 0.28 mm. General coloration: mix of pale and darker brown or reddish brown. Vestiture: Dorsum with dense setae, setae long; setae on posterior margin of forewing extremely long. Structure: Head: Eye almost half as high as head; muscle scars large. Thorax: Anterior pronotal margin concave, posterior margin slightly concave; pits on pronotum medium-sized, evenly distributed; scutellum in dorsal view gradually narrowed to tip, tip rounded. Forewing: With outline elongate oval; membrane contributing about one third of forewing length, posterior distal margin rounded, vein-tracing areoles small, distributed along scc, rc and rc1; C+Sc broad, wider at widest part of wing; distal process of R pronounced; An1 wing organ on corium strongly inflated, triangular, with median notch, without notch articulating with claval process; rc1 about 3 times as long as wide, slightly wider anteriorly; rc about 5 times as long as wide; tc about 3 times as long as wide; part of An1 and Cu forming posterodistal margin of tc of similar width as other veins; distal margin of rc1, rc, and tc cells double s-shaped; rc2-3 trapezoidal; cub almost reaching wing margin; dc1 with basal portion fairly narrow and elongate. Legs: Claws long. Genitalia (Fig. 7): Pygophore with slightly extended right margin; vesica with about half loop, not reaching right pygophore margin, very thick at midpoint, tapering to blunt tip, close to apex slightly s-shaped; anophoric ridge with process, process short, with single lobe relatively straight, tip pointed; right paramere curved, broad throughout, basal process broad; left paramere straight, tapering, basal process narrow. Female: Unknown. Collecting method: Collected using a flight intercept trap.