Campsurus cotaxe, 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 : 340

Campsurus cotaxe sp. nov.

( Figs. 140–144 , 176 )

Campsurus sp. nov. Angeli et al. 2015: 202.

Type material. Holotype ♂ i from BRAZIL, Espírito Santo, Nova Venécia, Rio Cotaxé , Patrimonio do Bis , S 18° 33' 28" / W 40° 20' 7", 16–17.iv.2012, pennsylvania light trap, KB Angeli col. ( CZNC). Paratypes: 45 ♂ i same data as holotype (5 ♂ i IBN, slide IBN730CM, remaining CZNC) ; 5 ♀ i from Espírito Santo, Sao Mateus, Rio Cotaxé , S 18° 37' 41" / W 40° 6' 42", 26–27.vii.2012, pennsylvania light trap, KB Angeli col. (IBN, slide IBN731CM).

Male imago. Length (mm): body, 7.8–8.5; foreleg, 3.1–3.3; fore wing, 6.9–8.0; hind wing, 3.5–3.6; cerci, 21.0–22.5. General coloration whitish yellow with grayish brown marks ( Fig. 176 ). Head whitish, shaded with black among ocelli; occiput pale, not shaded. Antenna whitish, shaded with gray. Thorax ( Fig. 176 ). Pronotum translucent, shaded with grayish brown anterolaterally. Mesonotum yellowish white, shaded with grayish brown dorsally, mainly on carinae, PSP and area between PSP. Metanotum yellowish white, shaded with grayish brown on submedian mark. Pleura and sterna shaded more widely with grayish brown, darker on carinae and mesofurcasternum. Legs yellowish white, shaded with gray. Wings. Membrane translucent with light brownish veins, darker near base and fore margin. Abdomen whitish translucent, shaded with grayish brown dorsally, darker toward rear segments ( Fig. 176 ); medial area of all nota pale, not strongly shaded. Sterna shaded almost completely with grayish brown. Genitalia translucent yellowish white, hind margin of sternum IX straight ( Fig. 140 ); pedestal bases distinctly separated in middle, pedestal with conical parastylus (p in Fig. 140, 141 ), subequal in length to main body of pedestal, inner corner also projected but slightly (ic in Fig. 140 ); penes base well developed (bp in Fig. 140 ); main lobe of penes yellowish translucent, long and cylindrical, curved ventromedially (ml in Fig. 140, 142–143 ); secondary lobe of penes whitish, shorter, cylindrical (sl in Fig. 140, 142–143 ). Caudal filaments whitish translucent.

Female imago. Length (mm): body, 9.5–11.2; foreleg reduced to coxa and trochanter; fore wing, 9.6–10.5; hind wing, 3.7–4.3; cerci, 3.0. Color pattern similar to male, except head with larger pale area on occiput, and abdominal sterna with paler medial area. Abdominal sternum VIII with small, paired, anteromedian, V-shaped sockets; furrow relatively narrow ( Figs. 144 ).

Egg. Length, 330–350 µm; width, 265–275 µm. Yellowish; no polar cap; with small, circular, amorphous, adhesive structure on convex side.

Etymology. The name, a noun in apposition, refers to the type locality, the river Cotaxé .

Distribution ( Fig. 181 ). Brazil (Espírito Santo).

Diagnosis. Campsurus cotaxe sp. nov., known from adults of both sexes, can be distinguished from other species of Campsurus by: 1) sternum IX with straight hind margin ( Figs. 140 ); 2) pedestal bases distinctly separated in the middle, parastylus conical, subequal in length to main body of pedestal, inner corner also projected but slightly ( Fig. 140–141 ); 3) penes base well developed, main lobe of penes long and cylindrical, curved ventromedially, secondary lobe of penes shorter, cylindrical ( Figs. 140, 142–143 ); 4) small size (length of male fore wings ca. 7–8 mm); 5) female sockets small, anteromedian and V-shaped ( Figs. 144 ); 6) egg without polar cap, with amorphous, circular structure on convex side.

Discussion. Campsurus cotaxe sp. nov. is similar to C. segnis and C. ulmeri , sharing the general form of pedestals and penes, especially the long and narrow penes lobes (main and secondary), that are medially and ventrally curved. These morphologically similar species can be distinguished because the base of the penes is well developed in C. cotaxe sp. nov. (bp in Fig. 140 ), and the penes lobes (mainly the secondary ones) are basally fused to the penes base ( Fig. 140 ). In the other two species, both penes lobes (main and secondary) form a more independent unit ( Fig. 138 ). Furthermore, the pedestals are different: the parastylus is shorter, narrowing toward the apex in C. cotaxe sp. nov., but it is long and slender from the base in the other two species.

Figures

FIGURES 181. Distribution maps.

FIGURES 138 – 145. C. segnis, holotype male imago: 138, genitalia, v. v.; 139, penes, v. v. Campsurus cotaxe sp. nov.: 140, genitalia, v. v.; 141, pedestal, v. v.; 142, penes, v. v.; 143, penes, l. v.; 144, female sternum VIII with detail of socket. C. amapaensis: 145, partial view of female sternum VIII with detail of socket.

FIGURES 176 – 177. Male imago, general view, dorsal: 176, C. cotaxe sp. nov.; 177, C. litaninensis.