Campsurus froehlichi Cruz & Molineri & Hamada 2022, sp. nov.

Campsurus froehlichi sp. nov. (Figures 3 A–J and 4 A–G) Material examined. Holotype: male imago (INPA) from Brazil; Amapá; Serra do Navio; Rio Cachaço, Cachoeira do Fernando; 61m. a.s.l.; 0.88856 / -52.02303; 02.viii.2011; A. Pes, P. V. Cruz, A. Fernandes cols. Paratypes: Four male imagos, same data as holotype. Additional material: 7 males and 1 female, imagos (3 males and female in IBN, 4 males in UFV) from Brazil, Amazonas, Barcelos, Serra do Aracá, (base), tributário do igarapé da Cobra, (BO6), 00º 52’ 13.2” N 63º 27’ 13.4” W, 147 m.a.s.l., 25–26. vii.2009, PRONEX-INPA equipe col., Pensylvannia trap. SURINAM: 11 male imagos from Brokopondo district, creek on N edge Brokopondo (5° 1′ 34″ N – 54° 59′ 24″ W), 90 m, 27.xii.1978, W.L. & J.G. Peters cols. (FAMU except 6 in IBN). Diagnosis. Male imago. 1) sternum IX with truncated posterior margin, medial line blackish (Fig. 3D); 2) pedestal of each side touching basally, inner projection digitiform, apically rounded, outer projection slender, long and apically rounded (Figs 3D and 3G); 3) main lobe of penis with basal half expanded laterally (ear-like) and with transverse ridge (Figs 3D–I); 4) dorsal surface of penis rugose (Fig. 3F); 5) secondary lobe translucent, slender and cylindrical, almost reaching the apex of main lobe (Figs 3E–I). Female imago. 1) anteromedian socket oval to circular in shape, internal sclerites with two openings (Figs 4D–F). Description. Male imago. Length (n= 2, mm): body, 6.5–7.6; fore wing, 5.5–6.5; hind wing, 2.0–2.6. General coloration yellowish, widely shaded with gray (Fig. 3A). Head completely shaded with black dorsally, brownish gray on gena, antenna with scape and pedicel brownish gray, flagellum yellowish. Thorax (Fig. 3A). Pronotum completely shaded with gray, darker on anterior portion. Mesonotum yellowish, shaded with gray on sutures. Metanotum yellowish, shaded with gray medially. Legs. Foreleg completely shaded gray, slightly paler at base of tarsomeres; middle and hind legs shaded completely with gray. Wings (Figs 3B–C). Membrane hyaline, except C and Sc areas shaded with brownish gray, veins hyaline, except C, Sc, and R 1 brownish; MP 2 not connected to IMP, ICu 1 connected to CuA, ICu 2 directly connected to ICu 1. Hind wing hyaline, except C and Sc areas very slightly shaded with gray; intercalary vein of radial sector long. Abdomen (Fig. 3A) widely and strongly shaded with gray on terga. Abdominal sterna translucent white, shaded with gray, slightly darker on medial line and inner margin of gill sclerites. Genitalia (Figs 3D–I): yellowish whitish; sternum IX with truncate posterior margin, medial line black; pedestal of each side touching basally, inner projection digitiform, short, and apically rounded, outer projection slender, long and apically rounded; forceps short and translucent, shaded with gray; base of main lobe of penis sclerotized, basal half expanded laterally (ear-like), proximal margin of expansion forming a transverse ridge (tr in figures 3G, 3I and 3J), with rugose dorsal surface (ru in Figure 3F); apical half narrowing toward apex, apex in ventral view pointed and with tip curved outwards (tco in Figure 3H); in lateral view main lobe of penis curved ventrally, apical half thin, apex pointed; secondary membranous lobe translucent, slender and cylindrical, almost reaching the apex of main lobe. Caudal filament translucent whitish. Female imago. Length (n= 1, mm): body, 7.3; fore wing, 7.5; hind wing, 3.0. Coloration (Figs 4A–C) and gray marks similar to male, except shaded more slightly with gray. Abdominal sternum VIII with anteromedian socket, oval to circular in shape, internal sclerites with two openings (Figs 4D – F). Egg. Length 285µ; width 225µ. Polar cap relatively large (Fig. 4G) formed by coiled threads. Egg yellowish bowl-shaped, granulated under photonic microscope. Etymology. The name of this species is in honor of Dr. Claudio Gilberto Froehlich for his significant contributions to the knowledge of the aquatic insects in South America. Discussion. Campsurus froehlichi sp. nov. belongs to a morphological group of species with the base of main lobe of penis (basal third or half) expanded (ear-like), pedestal with well-developed outer projection (long and slender or short and thick), and short and digitiform inner projection. Four species share the same scheme in the male genitalia, Campsurus zunigae Molineri & Salles, 2017, Campsurus pereirae, Campsurus janae Molineri & Salles, 2017 and Campsurus cristales Molineri & Granados-Martinez, 2019. The male imago of C. froehlichi sp. nov. can be distinguished from the ones of C. janae and C. cristales by its long and slender outer projection of pedestal; by its long secondary lobe of penis, while short in C. pereirae; and by its rugose dorsal surface of penis, while smooth in C. zunigae. The female imago of Campsurus froehlichi sp. nov. can be distinguished from the ones of C. pereirae and C. cristales by its circular socket, while subquadrate in C. pereirae and elongated in C. cristales. The female imago of C. janae and C. zunigae are unknown.Published as part of Cruz, Paulo Vilela, Molineri, Carlos & Hamada, Neusa, 2022, Two new species and new records of Campsurus Eaton (Ephemeroptera: Polymitarcyidae) in Amazon, pp. 435-444 in Zootaxa 5100 (3) on pages 440-443, DOI: 10.11646/zootaxa.5100.3.7, http://zenodo.org/record/620184