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

Guapinannus dispar, sp. n. (Figs 2, 9) Holotype. Female. BRAZIL: Mato Grosso: Jacare Alto Xingu, 10.54341°S 53.75637°W, 330m, 01 Nov 1965, Alvarenga & Werner, 1♀ (UCR _ ENT 00090847) (FMNH). Etymology: Named for the characteristic wing venation after “dispar” Latin for different. Diagnosis: Recognized by the very small size (total body length 0.66 mm), forewing with distinct honey-comb pattern (black arrow), absence of An1/2 claval process, expanded scc divided by sinuous, transverse vein (white arrow), length and shape of rc1 (black star), distinctly surpassing apex of rc and tc, rectangular rc2–3 (white star), and slender and elongate cub (grey star) and tc (Fig. 2). Description: Female: Total body length 0.66 mm; length from posterior margin of pronotum to posterior wing margin 0.51 mm; greatest width across pronotum 0.28 mm; greatest width across forewings 0.42 mm. General coloration: mix of pale and darker brown or reddish brown. Vestiture: Dorsum with sparse, short setae; setae on posterior margin of forewing long. Structure: Head: Eye almost half as high as head; muscle scars small. Thorax: Anterior pronotal margin concave, posterior margin almost straight; pits on pronotum large, evenly distributed; scutellum in dorsal view gradually narrowed to tip, tip pointed. Forewing: with outline broad anteriorly, elongate oval; with distinct honey-comb pattern; membrane contributing less than one third of forewing length, posterior distal margin rounded, vein-tracing areoles on proximal part of wing absent; C+Sc narrow, wider at widest part of wing; distal process of R weakly developed; An1/2 process on clavus absent; An1 wing organ absent (as in all females); rc1 about 4 times as long as wide, much wider anteriorly; rc about 4 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 angular s-shaped; rc2-3 rectangular; cub removed from wing margin; dc1 with basal portion relatively wide and short. Legs: Claws short. Genitalia: As in generic description. Male: Unknown. Collecting method and habitat: Unknown. Discussion: This species is set apart from all other species of Guapinannus both in terms of morphology (size, forewing sculpture, wing venation) and distribution (the only documented species of Guapinannus from Brazil). We decided to include this species into Guapinannus and to somewhat expand the concept of this genus, because G. dispar, sp. n., is more similar to species of “core” Guapinannus than to any other species of Schizopteridae we have seen from the Neotropical region. Once male specimens become available for this species, our hypothesis should be further tested.
Published as part of Frankenberg, Sarah, Knyshov, Alexander, Hoey-Chamberlain, Rochelle & Weirauch, Christiane, 2021, Taxonomic revision of Guapinannus Wygodzinsky, 1951 (Hemiptera: Schizopteridae), with description of 19 new species, pp. 261-286 in Zootaxa 4958 (1) on pages 270-272, DOI: 10.11646/zootaxa.4958.1.14, http://zenodo.org/record/4691718