Campsurus litaninensis Spieth, 1943

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 : 341-342

Campsurus litaninensis Spieth

( Figs. 151–162 , 177 )

Campsurus litaninensis Spieth, 1943: 5 (male, female); Domínguez et al., 2006: 573.

Type material (not studied). SURINAM: upper Litani river, 4.viii.1939, Geijskes col.

Other material. BRAZIL: 28 ♂ i and 2 ♀ i from Rio de Janeiro, Lagoa de Juturnaiba [S 22° 37' 46" / W 42° 18' 8"], Silva Jardim , 25.i.1978, SM Pereira col. ( CZNC, except 4 m and 1 ♀ i in IBN) ; 2 ♂ i (used in redescription below, color pattern well-preserved) from Roraima, Caracaraí, rio Branco, Bem Querer , N 01°55' / W 61°00', 18– 21.xi.2002, AMO Pes col. ( CZNC) ; 5 ♂ i from Roraima, Boa Vista, Rio Cauamé , N2° 49' 11" / W 60° 40' 24", 28.ii.2003, UV light trap ( CZNC) ; 7 ♂ i and 6 ♀ si from Roraima, Boa Vista, Rio Cauamé, N 2° 49' 11" / W 60° 40' 24", 29.v.2009, Pennsylvania light trap, Fusari & Fernandes cols. ( CZNC) . FRENCH GUIANA: 8 ♀ i from Sinnamary, Riv. Saut Dalles, 10.v.1994, V Horeau ( FAMU, except 1 f on slide IBN613CM) ; 4 ♂ i same data except date: 10.iv.1993 ( FAMU, except slide IBN370CM) [ Sinnamary is at N 05°22' / W52 ° 36'].

Male imago. Length (mm): body, 10.0–13.0; foreleg, 4.0–5.5; fore wing, 8.6–12.5; hind wing, 4.1–5.7; cerci, 24.0–32.0. General coloration yellowish ( Fig. 177 ). Head yellowish, shaded with black among ocelli, occiput not shaded ( Fig. 177 ). Antenna whitish, shaded with gray. Thorax ( Fig. 177 ). Pronotum yellowish translucent, shaded with gray medially, with shading breaking laterally (not on meson) between anterior and posterior portions, blackish medial band (not reaching hump anteriorly), hump hyaline. Mesonotum orangeish, shaded with gray along medial line (forming triangular shaded area near mesoscutal protuberance) and parapsidal sutures, area between PSP also shaded gray; inner and outer margins of parapsidal sutures suffused with gray. Metanotum yellowish, shaded very slightly with gray medially. Pleura and sterna paler than nota. Legs yellowish, fore leg shaded completely with gray except coxa, shaded less marked at apex of tarsites 4 & 5 and apex of claw. Wings. Membrane yellowish translucent; veins translucent yellowish, very slightly shaded with gray, darker on C and Sc; hind wing veins yellowish, not shaded gray. Abdomen ( Fig. 177 ) yellowish, shaded with gray dorsally on terga III– X, except medial pale band (progressively thinner posteriorly), tergum II very slightly shaded submedially, terga III–VII with submedian][-shaped marks (progressively larger toward posterior segments) and with posterior transversal portion (of [-mark) extending laterally; terga III–VII also with transverse, gray dash posterolaterally; terga VIII–IX more extensively shaded; tergum X very slightly shaded laterally. Sterna whitish yellow, except gill sclerites and sternum IX yellowish. Genitalia ( Figs. 151–156, 158–162 ) yellowish, hind margin of sternum IX strongly projected posteriorly (arrow in Fig. 159 ); pedestal bases distinctly separated, with narrow bar connecting them medially ( Fig. 151 ), parastylus rotated (parastylus in dorsal position, inner corner projected and located ventrally); pedestal (pd in Fig. 159 ) with well-developed and apically rounded parastylus (p in Fig. 161 ), inner corner also roundly projected (ic in Figs. 152, 161 ); penes base large (bp in Fig. 159 ); main lobe of penes fingerlike, strongly sclerotized dorsally, strongly curved ventrally ( Figs. 154–156 ), secondary lobe of penes very short, blunt and subtriangular ( Figs. 155, 159, 162 ). Caudal filaments whitish translucent.

Female imago. Length (mm): body, 11.5–13.0; fore wing, 12.5–15.0; hind wing, 5.5–7.0; cerci, 5.5–6.0. Similar to male. Abdominal sternum VIII with single, subquadrate, anteromedian socket, opening toward anterior margin ( Fig. 157 ).

Egg. Length 260–285µm, width 220–260µm, polar cap length 10µm, and width 70–75µm. General coloration yellowish white with whitish, small polar cap. Polar cap 0.3× maximum width of egg.

Distribution ( Fig. 178 ). Surinam (orig.). New records: Brazil (Rio de Janeiro, Roraima), French Guiana.

Diagnosis. Campsurus litaninensis , known from adults of both sexes, can be distinguished from other species of Campsurus by: 1) sternum IX extremely projected medially ( Fig. 159 ); 2) pedestals bases distinctly separated in the middle but connected by a narrow band ( Figs. 151 ), parastylus rotated (the parastylus is in a dorsal position, with the inner corner projected and located ventrally); 3) penes base well-developed but almost completely hidden by the projected sternum, main lobe of penes finger-like, curved ventrally, secondary lobe very small and fused with penes base ( Figs. 155, 159, 162 ); 4) medium size (length of male fore wings ca. 9–13 mm); 5) female sternum VIIII with single anteromedian socket, subquadrate, opening toward anterior margin ( Fig. 157 ); 6) egg with small, type III polar cap 0.3× maximum width of egg.

Discussion. Campsurus litaninensis shares some characters with the violaceus -group of species ( Molineri et al. 2015a): the finger-like penes and the reduction of secondary lobes (sometimes present, but reduced in selected species of the violaceus -group), and the completely fused, subquadrate sockets on female abdominal sternum VIII. The pedestals nevertheless present a short parastylus, as in most species treated in this paper (those related to C. essequibo , C. segnis and C. lucidus ).

Figures

FIGURES 178. Distribution maps.

FIGURES 151 – 162. Campsurus litaninensis, adult: 151, male genitalia, v. v.; 152 – 153, details of pedestal, v. v; 154, genitalia, l. v.; 155 – 156, details of penes, l. v.; 157, detail of female socket, v. v.; 158, detail of pedestal, v. v. SEM: 159, male genitalia, v. v.; 160, detail of microtrichia on male sternum IX; 161, detail of pedestal, v. v.; 162, detail of penes, v. v.

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