Campsurus segnis Needham & Murphy, 1924

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 : 338-340

Campsurus segnis Needham & Murphy

( Figs. 138–139 , 146–150 , 176 )

Campsurus segnis Needham & Murphy, 1924: 19 ; Morgan, 1929: 61; Spieth, 1943: 5; Traver, 1947: 380; Domínguez et al., 2006: 579.

Type material. Holotype ♂ i slide N°622.1 from GUYANA, Bartica , 14.xi.1920, AE Emerson col. (body and wings, CUIC), and paratype ♂ i slide N°622.4 (wings, CUIC) and slide N° 622.6 (genitalia and wings, CUIC), same data as holotype.

Additional material. FRENCH GUIANA: 6 ♂ i and 6 ♀ i from Sinnamary, riv. Saut Aimara, piège lum., 14.vi.1994, V Horeau col. ( FAMU, except 1 ♂ i and 1 ♀ i at IBN, slides IBN372CM and IBN371CM). VENEZUELA: 2 ♂ and 7 ♀ i from Bolivar, Aponwao (sitio 1), N 5° 51' 2" / W 61° 27' 52", 1340m, 20.xi.2005, ME Grillet col. ( MLBV) ; 2 ♂ and 6 ♀ i from Bolivar, Kavanayen (sitio 3), N 5° 37' 27" / W61° 44' 37", 1355m, 21.xi.2005, ME Grillet col. (IBN) ; 1 ♂ and 4 ♀ i from Bolivar, Mareman-Paru (sitio 6), N 5° 44' 49" / W61° 24' 06", 1308m, 26.vi.2007, ME Grillet col. (IBN).

Male imago. Length (mm): body, 8.5–9.8; forewing, 8.0–9.8; hind wing, 3.5–4.5; cercus, 22.0–24.0; forelegs lost.

Female imago: body, 9.0–12.8; fore wing, 11.7–13.0; hind wing, 4.2–5.0; cercus, 3.7–4.0. Sockets on abdominal sternum VIII formed by long, thin furrow, ending in two separated, but contiguous, sockets ( Figs. 149– 150 ).

Egg. Length, 320–335 µm; width, 250–260 µm. Yellowish, no polar cap, with small circular, amorphous adhesive structure on convex side.

Distribution ( Fig. 181 ). Guyana (orig.), Brazil (Pará, Igarape-Açu, 25.i.1912, HS Parish col., in Needham & Murphy 1924, approx S 1° 7' 37" / W 47° 37' 23"). New records: French Guiana and Venezuela.

Diagnosis. Campsurus segnis is known from adults of both sexes, and it can be distinguished from other species of Campsurus by: 1) male sternum IX with straight to broadly convex hind margin ( Fig. 138 ); 2) pedestal bases distinctly separated in the middle ( Fig. 138 ), parastylus very long and slender (p in Fig. 138 ), inner corner also projected but slightly (ic in Fig. 138 ); 3) penes base large (bp in Fig. 138 ), main lobe of penes thin, long and cylindrical, curved ventromedially (ml in Figs. 138–139 ), secondary lobe of penes long and slender (sl in Figs. 138–139 ) but shorter than main lobe; 4) small size (length of male fore wings 7–8 mm); 5) female sockets formed by a long, thin furrow ending in two separated but contiguous sockets ( Figs. 149–150 ); 6) eggs without polar cap, with amorphous structure on convex side.

Discussion. Campsurus segnis is similar to C. ulmeri Traver (1947) and to C. cotaxe sp. nov. because all of them have pedestals that are distinctly separated in the middle, a relatively long parastylus and thin, long and cylindrical penes lobes. Details that separate these species are discused below.

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 146 – 150. C. segnis (specimens from Venezuela): 146, male imago, abdomen, laterodorsal view; 147, female imago, abdomen, d. v.; 148, female head and thorax, v. v. (fs = mesofurcasternum, im = inner margin, p = mesofurcasternal plates, L = middle legs); 149, abdominal sterna (g = gonopore and eggs, sk = sockets, roman numbers = segment number); 150, detail of sockets (arrows indicate socket´s openings).

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