Campsurus cuyuniensis Traver, 1947

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 : 312-314

Campsurus cuyuniensis Traver

( Figs. 51–53 )

Campsurus cuyuniensis Traver, 1947: 387 ; Domínguez et al., 2006: 569.

Type material. GUYANA: holotype ♂ i slide (wings) and paratype ♂ i slide (genitalia), both under the same number (N°2434, CUIC) from: between Camaria and Matope on the Cuyuni River , 23.vii.1924, swarming 4–5 pm, WA Myers col.

Additional material. FRENCH GUIANA: 3 ♂ i from Sinnamary, riv. Saut Aimara, piège lum., 14.vi.1994, V. Horeau col. ( FAMU). The approximate coordinates of this locality are: N 5°4' / W 53° 3' ( Reynaud 1998) . BRAZIL: 2♂ i from RR, Boa Vista, río Cauamé , N 2° 49' 11" / W 60° 40' 24", 29.v.2009, Pennsylvania light trap, Fusari & Fernandes cols. ( CZNC) .

Male imago. Length (mm): body, 5.1–6.0; fore wing, 5.4–5.7; hind wing, 2.5; cerci, 16.5–17.5; fore leg, 2.6– 2.7. General coloration whitish yellow. Head yellowish shaded with gray dorsally, except along hind margin and small area among ocelli and base of antenna. Antennae yellowish white, shaded with gray. Thorax. Pronotum yellowish translucent, posterior margin grayish; prosternum and propleura pale almost without shading. Mesonotum yellowish shaded with gray on thin triangular anteromedian area and between PSP; pleura yellowish; mesofurcasternum shaded gray; metanotum and metasternum yellowish white. Legs. Fore leg yellowish white, shaded with gray on thin lateral strip on coxa, two longitudinal stripes on femur, entirely on tibia, but not at base of tarsomeres and claws; middle and hind legs yellowish translucent, shaded very slightly with gray. Wings. Membrane hyaline; veins Sc and R1 shaded gray, darker on basal 2/3, lighter toward apex; other veins yellowish translucent. Hind wing with base and Sc grayish, remaining veins translucent. Abdomen whitish translucent, widely shaded with gray on terga except on intersegmental membranes and pale lateromedian dash on terga III–VII and with pale mediolongitudinal line, terga VIII–X shaded more uniformly but with some pale spots and black dashes on IX. Abdominal sterna yellowish white, shaded very slightly with gray. Genitalia ( Figs. 51–53 ): sternum IX slightly shaded with gray posteromedially and along medial line (except thin medial line, pale), with medially concave hind margin ( Fig. 53 ); pedestal of each side touching basally, with large parastylus apically thinner and acute (best seen in lateral view), inner corner acutely projected ( Figs. 51 ); forceps short and whitish; base of penes pyramidal; main lobe of penes large and sclerotized, slightly curved ventrally and with acute apex curved ventrally outwards, secondary membranous lobe cylindrical and relatively long ( Fig. 53 ). Caudal filament translucent yellowish white.

Distribution ( Fig. 179 ). Guyana (orig.). New records: Brazil (RR), French Guiana.

Diagnosis. Campsurus cuyuniensis can be distinguished from other species of Campsurus , in the adult stage, by: 1) posterior margin of male abdominal sternum IX convex but medially concave ( Fig. 53 ); 2) pedestals long and slender, well-developed, outer-posterior margin strongly projected forming a long parastylus (apically pointed and curved in lateral view), inner margin also projected but shorter ( Figs. 51–53 ); 3) forceps are extremely shortened, thus total length of pedestal (from base to apex of parastylus) is subequal to total forceps length; 4) penes separated and subparallel, formed by a large dorsal sclerotized lobe with acute curved apex, and a relatively large ventral membranous lobe ( Fig. 53 ); 5) small size (length of male fore wings ca. 5.4–6.0 mm).

Discussion. Campsurus cuyuniensis type slides include well-preserved male wings and damaged genitalia. Reliable characters to distinguish the species are found in the male genitalia, but in this case the penes are shrunken, hardly visible and had been separated from the pedestals during slide preparation. Features are visible on these pedestals, however, that positively allow new individuals (those from French Guiana listed above) to be assigned to C. cuyuniensis : they are large, with parastylus well developed, but forceps are extremely shortened, thus total length of pedestal (from base to apex of parastylus) is subequal to total forceps length (in the type material the forceps are slightly shorter,but in the new material are slightly longer). Another unique characteristic of C. cuyuniensis is the apical curvature of parastylus in ventral view ( Fig. 53 ), but this actually is the result of a dorsal curvature (better seen in lateral view). The penes of C. cuyuniensis present long and slender lobes (main and secondary), similar to C. nessimiani sp. nov., but in the latter species, the apex of the main lobe is spatulate (in lateral view), while in C. cuyuniensis is acute and curved.

Figures

FIGURES 179. Distribution maps.

FIGURES 51 – 59. male imagos. Campsurus cuyuniensis: 51, paratype forceps (CUIC 2434); 52, same but from another paratype; 53, male genitalia from French Guiana specimen (FAMU), v. v. Campsurus nessimiani sp. nov.: 54, genitalia, v. v.; 55, same, l. v. Campsurus dasilvai sp. nov.: 56, genitalia, v. v.; 57, same, l. v.; 58, genitalia, v. v. (SEM), with detail of microlepides on sternum IX; 59, details of penes, v. v. (SEM).