Campsurus dasilvai Molineri & Salles 2017, sp. nov.

Campsurus dasilvai sp. nov. (Figs. 56–59, 167) Type material. Holotype male imago from BRAZIL, Amazonas, Rio Demeni, barco, 8–9.viii.2009, pennsylvania light trap, N Hamada col. (CZNC) [approx. S 00°25'29" / W 62°54'20"]. Paratypes: 1 ♂ i from Roraima, Caracaraí, rio Branco, Bem Querer, N 01°55' / W 61°00', 18–21.xi.2002, AMO Pes col. (CZNC); 4 ♂ i from Amazonas, Rio N. Aripuanã, Rio Juma, Ig. Campineiro Gde., 8–9.ix.2004, pennsylvania light trap (CZNC); 12 ♂ i and 1 ♂ si from Amazonas, Barcelos, rio Demeni, barco, 8–9.viii.2009, pennsylvania light trap, N Hamada col. (CZNC, except 5 ♂ i IBN) [approx. S 00°25'29" / W 62°54'20"]; 5 ♂ i from Roraima, Boa Vista, rio Cauamé, N 2° 49' 11" / W 60° 40' 24", 29.v.2009, L Fusari & A Fernandes cols. (CZNC). Additional material. BOLIVIA: 5 ♂ i from Beni, río Itenez, Bella Vista, Laguna La Granja, 137 m, S 13° 14' 1" / W 63° 43' 22", 9.v.2006, E Domínguez & C Molina cols. (IBN). Male imago. Length (mm): body, 6.5–7.5; fore wing, 6.0–6.5; hind wing, 3.0–3.3; cerci, 18.0–21.5; fore leg, 2.8–3.4. General coloration whitish yellow (Fig. 167). Head yellowish, completely shaded with gray dorsally except around median ocellus and base of antenna. Antennae yellowish white, shaded with gray. Thorax (Fig. 167). Pronotum hyaline translucent, very slightly shaded with light gray on lateral and hind margins; prosternum and propleura pale, with grayish spot between coxae. Mesonotum yellowish, shaded with gray very slightly on median zone of scutum but darker on and between PSP; pleura and sterna yellowish white, without shading; metathorax yellowish, shaded with gray medially on notum. Legs. Fore leg whitish translucent, shaded completely with purplish gray except at base of tarsomeres and claws; middle and hind legs yellowish translucent. Wings. Membrane hyaline veins shaded slightly gray, paler toward apex, cross veins hyaline except slightly shaded gray on C area. Hind wing with faintly grayish veins, Sc darker. Abdomen whitish translucent, shaded slightly with gray on terga except on mediolongitudinal line, intersegmental membranes and pale lateromedian dash on terga III–VII, terga VIII–IX shaded more uniformly but with some pale spots, tergum X pale with light gray hind margin. Abdominal sterna translucent white, yellowish toward gill sclerites and sternum IX. Genitalia (Figs. 56–59): pale except grayish secondary lobe of penes; sternum IX with truncate (Fig. 56) to slightly concave (Fig. 58) hind margin, covered by 3–7 pointed microlepides (detail on Fig. 58); pedestal of each side touching basally, with large apically rounded parastylus (in ventral view, Figs. 56, 58) but acute at lateral view (arrow in Fig. 57), round inner corner strongly projected (ic in Fig. 56); forceps whitish except grayish at base; base of penes wide proximally, narrowing abruptly on distal half (bp in Fig. 56); main lobe of penes (ml in Fig. 56) very wide at base, large and sclerotized, slightly curved ventrally and with pointed apex; secondary membranous lobe of penes (sl in Fig. 56) large and cylindrical. Caudal filament translucent yellowish white. Etymology. We dedicate this species to Elidiomar Ribeiro da Silva, advisor of FFS when he was an undergraduate student aiming to contribute to the taxonomy of Campsurus. Distribution (Fig. 179). Brazil (Amazonas, Roraima), Bolivia. Diagnosis. Campsurus dasilvai sp. nov. is only known from male adults that can be characterized as follows: 1) posterior margin of male abdominal sternum IX truncate to slightly concave (Fig. 56, 58), sternum IX sculptured with 3 to 7 pointed microlepides (Fig. 58); 2) pedestals long and slender, well-developed, outer-posterior margin projected and forming a long parastylus with rounded apex (truncate and apically pointed in lateral view, Fig. 57), inner margin also projected but shorter (ic in Fig. 56); 3); penes separated and converging distally, each arm formed by a large dorsal sclerotized lobe with a wide base (ml in Fig 56), and a relatively large ventral apically rounded membranous lobe (sl in Fig 56), apex of main lobe of penes acutely pointed (Fig. 57); 4) small size (length of male fore wings 6.0– 6.5 mm). Discussion. Please see characters to separate C. dasilvai sp. nov. from closely related species in the discussion of C. nessimiani sp. nov., above.Published as part of Molineri, Carlos & Salles, Frederico F., 2017, Review of selected species of Campsurus Eaton 1868 (Ephemeroptera: Polymitarcyidae), with description of eleven new species and a key to male imagos of the genus, pp. 301-354 in Zootaxa 4300 (3) on pages 317-318, DOI: 10.11646/zootaxa.4300.3.1, http://zenodo.org/record/83843