Campsurus salobra, Molineri & Salles, 2017

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, Zootaxa 4300 (3), pp. 301-354 : 307-309

Campsurus salobra sp. nov.

( Figs. 25–34 , 164 )

Type material. BRAZIL: holotype ♂ i from Mato Grosso do Sul, Bodoquena, rio Salobra , Canaã , S 20°33’08.8” / W 056°40’49.7”, 210 m, 27.ii.2012, FF Salles, FH Silva cols. ( CZNC) . Paratypes: 13 ♂ i and 7 ♀ i, same data as holotype (4 ♂ i and 3 ♀ i IBN, rest in CZNC) .

Male imago. Length (mm): body, 12.0–13.4; fore wing, 10.6–12.5; hind wing, 5.2–5.5; cerci, 32.0–34.0; fore leg, 4.7–5.5. General coloration whitish, with well-defined gray markings dorsally. Head yellowish white, almost completely shaded with black dorsally except medially on occiput. Lateral ocelli with purplish gray line around whitish area. Antennae whitish translucent, shaded with purplish gray. Thorax ( Fig. 164 ). Pronotum translucent, anterior portion almost completely shaded with gray, paler at medial zone, pronotal hump translucent; posterior pronotal portion translucent, shaded with black on lateral subrectangular mark and small submedian mark, medial line and posterior margin blackish; prosternum whitish. Mesonotum yellowish, almost completely shaded with gray except for unpigmented anteronotal projection (ap in Fig. 164 ), and blackish mps and area between PSP; with gray V-shaped mark (arrow in Fig. 164 ) on mesoscutum after anteronotal impression; pleura and sternum yellowish; metanotum yellowish shaded medially with gray. Legs: fore legs whitish, almost completely shaded with purplish gray, becoming lighter on tarsi, claws pale; middle and hind legs yellowish translucent. Wings. Membrane hyaline except base and fore margin purplish gray; fore wings with veins C, Sc and R1 purplish gray, lighter toward apex; other longitudinal and cross veins whitish translucent; hind wing with whitish veins. Abdomen ( Fig. 164 ) translucent whitish slightly shaded with gray dorsally except pale at medial band, lateral transversal irregular mark on terga III–VII, and lateral longitudinal mark on terga VIII–X, terga IX–X slightly darker; abdominal sterna pale without shading, except triangular anterolateral gray mark on sternum VIII. Genitalia: sternum IX with light grayish medial mark, with blunt medial projection ( Figs. 25, 29 ), and covered with small microtrichiae (detail in Fig. 29 ); pedestal bases well separated from each other, pedestals yellowish, with outer apical corner acute, projected in small parastylus ( Figs. 25, 29 ); forceps whitish; penes whitish except dorsal sclerotized margin yellowish and transverse gray line at base of secondary lobe, base of penes large and subquadrangular ( Figs. 25, 29 ), main lobe of penes conical and ventrally curved, only with tiny apical portion pointed and twisted, dorsal margin in lateral view smoothly curved without indentations ( Figs. 25–26, 29–30 ), secondary lobe of penes cylindrical (sl in Figs. 26, 30 ). Caudal filament translucent whitish.

Female imago. Length (mm): body, 12.1–15.0; fore wing, 15.5–17.0; hind wing, 6.0–7.2. Similar to male, except pigmentation more marked. Sternum VIII with fused anteromedian sockets ( Figs. 2 7–28, 31 –32 ), sockets relatively long and opening towards median line ( Figs. 31–32 ).

Egg. Length, 314 µm; maximum width, 263 µm. Ovoid outline, bowl-shaped, one polar cap present, relatively large (length 32 µm, width 142µm), formed by ca. 10 long coiled threads ( Figs. 33–34 ). Polar cap 0.5× maximum width of egg.

Etymology. The name alludes to the type locality.

Distribution ( Fig. 178 ). Brazil (Mato Grosso do Sul).

Diagnosis. Campsurus salobra sp. nov. can be distinguished from all other species of the genus by the following combination of characters. In the adult: 1) posterior margin of male abdominal sternum IX convex and subtriangular, medially rounded (mp in Figs. 25, 29 ), surface covered with microtrichiae ( Fig. 29 ); 2) pedestal bases well separated from each other, pedestals subquadrate with outer-posterior margin projected forming a short and acute parastylus (p in Figs. 25, 29 ); 3) penes separated and slightly diverging distally ( Figs. 25–26, 29–30 ), each arm formed by a large and sclerotized lobe (ml in Fig. 30 ), and a relatively large secondary membranous lobe (sl in Fig. 30 ); 4) medium to large size (length of male fore wings 10.6–12.0 mm); 5) female sternum VIII with anteromedian paired sockets (arrow in Figs. 27, 31 ), sockets relatively long and rounded, opening toward medial line (arrow in Fig. 32 ); 6) medium sized polar cap present in the egg ( Figs. 33–34 ), polar cap 0.5× maximum width of egg.

Discussion. Campsurus salobra sp. nov. is closely related to C. latipennis and C. evanidus ; differences among them are discussed under the first species section.

Figures

FIGURES 178. Distribution maps.

FIGURES 25 – 34. Campsurus salobra sp. nov., adult: 25, male genitalia, v. v.; 26, same, l. v.; 27, female sternum VIII; 28, detail of female sockets. SEM photographs: 29, male genitalia, v. v. (with detail of microtrichiae); 30, apical portion of penes, v. v.; 31, female sterna VIII – X; 32, female sockets (with detail of microtrichia); 33, egg, convex side; 34, detail of capped pole.

FIGURES 163 – 166. Male imago, general view, dorsal: 163, C. latipennis; 164, C. salobra; 165, C. essequibo; 166, C. nessimiani sp. nov. Abbreviations: ap = anteronotal projection, mps = medio parapsidal suture, ph = pronotal hump, psp = posteroscutal protuberances.

FIGURES 1 – 12. Campsurus latipennis, adult. Male imago: 1, genitalia, ventral view (v. v.); 2, details of pedestal, v. v.; 3, detail of penes and pedestals, v. v.; 4 – 5, penes, lateral view (l. v.); 6, genitalia, l. v. SEM photographs: 9, genitalia, v. v.; 10, detail of microtrichia on sternum IX; 11, pedestal, v. v.; 12, detail of penes, v. v. Female adult: 7, abdominal sternum VIII; 8, detail of sockets. Abbreviations: bp = base of penes, ml = main lobe of penes, mp = median projection of sternum IX, ps = parastylus, sl = secondary lobe of penes.

FIGURES 13 – 24. Campsurus latipennis, nymph. 13, head, d. v. (long setae omitted); 14, left mandible, d. v. (row of filtering setae indicated with dashed line); 15, right mandible, v. v. (filtering setae as in previous figure); 16, apex of right mandibular tusk; 17, foreleg, d. v. (filtering setae not shown); 18, foreleg, v. v. (only filtering setae are indicated, with dashed lines); 19, foretarsal claw; 20, middle leg, d. v.; 21, middle tarsal claw; 22, hind leg, d. v.; 23, hind tarsal claw; 24, paraprocts with spines indicated (arrow).