Campsurus inusitatus, 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 : 332-333

Campsurus inusitatus sp. nov.

( Figs. 117–122 , 175 )

Campsurus sp. D Traver 1947: 394 ( Figs. 38–39 )

Material. Holotype ♂ i from BRAZIL, Amazonas, Barcelos , rio Demeni , boca do rio, 8–9.viii.2009, S 0° 25' 29" / W 62° 54' 20", 8–9.viii.2009, pennsylvania light trap, N Hamada col. ( CZNC). Paratypes: 1 ♂ i same data as holotype ( CZNC) ; 2 ♂ i from Roraima, Caracaraí, rio Branco, Bem Querer , N 01°55' / W 61°00', 18–21.xi.2002, AMO Pes col. (IBN, slide IBN776CM) ; 1 ♂ i from Amazonas, Barcelos, Serrinha, rio Aracá , N 00°24'33,88" / W 63°23'17,16", 30.vii.2009, pennsylvania light trap, N Hamada col. ( CZNC) ; 7 ♂ i (2 without terminalia) from Amazonas, Barcelos, Serrinha, rio Aracá , N 00°24'34" / W 63°23'17", 29.vii.2009, pennsylvania light trap, N Hamada col. ( CZNC).

Additional material. 4 ♂ i from Brazil, 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, 7.0–8.5; foreleg, 3.2–3.6; fore wing, 7.0–8.0; hind wing, 3.0–3.6; cerci, 17.5–21.0. General coloration yellowish white ( Fig. 175 ). Head whitish, shaded with black dorsally except on genae and three stripes on occiput: medial, lateral oblique and lateral transverse; head ventrally with small gray marks on remnants of mouthparts. Antenna whitish, shaded with gray. Thorax ( Fig. 175 ). Pronotum nearly completely translucent, but slightly shaded with gray, except at pale transverse curved band on lateral area (limit between anterior and posterior pronotal portions) and subapical transverse line crossing entire width of pronotum near hind margin; propleura and sternum whitish, diffusely shaded gray. Mesonotum yellowish white, shaded with gray except on anteronotal protuberance; gray, V-shaped mark after that protuberance, and shaded more strongly between PSP. Pleurae and sternum more diffusely shaded, slightly darker along lateral side of mesofurcasternum. Metanotum paler than mesonotum and almost without shading; metafurcasternum with submedian gray mark. Legs. Fore coxa yellowish white, shaded with gray except on ventral band; femur whitish with gray shading on dorsal and ventral margins; remaining portions translucent grayish, but paler at claws and base of tarsites. Middle and hind legs whitish translucent, shaded with gray almost completely. Wings. Membrane hyaline, veins whitish translucent, fore wing shaded very slightly gray on costal brace and veins C, Sc and R1; hind wing shaded gray on first costal vein. Abdomen ( Fig. 175 ) whitish shaded with gray dorsally on small submedian spot on tergum II, and on larger][-shaped marks on terga III–VII (marks increasing in size toward posterior segments); terga VIII–IX more widely pigmented except median band; tergum X with posterolateral corners projected. Pleural folds shaded gray. Sterna shaded slightly gray on yellowish gill sclerites. Genitalia ( Figs. 117–122 ): sternum IX short and wide, with medial furrow (mf in Fig. 117 ), covered with 1- to 4-pointed microlepides ( Fig. 118 ); pedestal small, without parastylus (p in Fig. 117, 119 ), transversally elongated, pedestals fused with each other medially ( Figs. 117, 119, 121 ); forceps slightly longer than penes; penes large and translucent, widely separated from each other ( Figs. 117, 121 ); main lobe of penes blade-like and slightly curved medially and ventrally (ml in Figs. 117, 120, 122 ), secondary lobe of penes conical, membranous and with few tiny spines at apex (sl in Figs. 117, 120, 122 ). Paraprocts (p in Fig. 122 ) well developed, fused and curved dorsally, only apex protruding distally. Caudal filaments whitish translucent.

Etymology. From the Latin inusitatus— meaning unusual or rare — in reference to the strange genitalia.

Distribution ( Fig. 180 ). Brazil (Amazonas, Roraima), Guyana.

Diagnosis. Campsurus inusitatus sp. nov., only known from males, can be distinguished from other species of Campsurus , by: 1) sternum IX short and wide, with a strong medial furrow ( Figs. 117, 121 ); 2) pedestals fused to each other in the middle, without projections; 3) penes large and distinctly separated in the middle; main lobe of penes blade-like and slightly curved medially and ventrally, secondary lobe of penes conical with a few tiny spines at the apex ( Figs. 117, 120 ); 4) small size (length of male fore wings ca. 7–8 mm).

Discussion. Traver (1947) briefly described one specimen from Guyana (Kartabo, 17.iv.1924, Cornell University Expedition, approx. N 6° 24' / W 58° 39') as Campsurus sp. D, also illustrating part of the genitalia. We here describe the species based on additional material collected in Brazil that shares the same unusual structure in pedestals and penes illustrated by Traver (1947: Figs. 38–39 ). Campsurus inusitatus sp. nov. shows a distinctive enlargement of paraprocts shared with a few other species: C. lucidus , C. demeni sp. nov., C. sinamari sp. nov. and C. indivisus . Campsurus inusitatus sp. nov. seems to be related to C. indivisus , because both species share the strong medial indentation of sternum IX, gonopores opening at the base of the main lobe of penes (nevertheless, C. inusitatus sp. nov. also presents remnants of the normal gonopore at the apex of the main lobe), and other general aspects of the penes. Both species can be readily distinguished, because the pedestals of C. inusitatus sp. nov. do not have projections (though parastyli are present in C. indivisus ), and by the large blade-like penes (smaller and more cylindrical in C. indivisus ). Finally, Traver (1947) stated that C. inusitatus (as Campsurus sp. D) was related to C. quadridentatus Eaton (1871) (considered by Molineri et al. 2015a to be a nomen dubium), but we can say that the latter species, in spite of being very poorly known, does not possess a secondary lobe on the penes.

Figures

FIGURES 180. Distribution maps.

FIGURES 117 – 122. Campsurus inusitatus sp. nov., male imago, SEM photographs: 117, genitalia, v. v. (g? = gonopore, mf = median furrow of styliger, ml = main lobe of penes, sl = secondary lobe); left mandible, v. v.; 118, detail of microlepides on sternum IX; 119, detail of penes and pedestals (note that penean membrane was broken during preparation); 120, detail of penean lobes, v. v. Line drawings: 121, male genitalia, v. v.; 122, male terminalia, l. v. (t. IX – t. X = tergum IX and X, s. IX = sternum IX, c = cercus base, p = paraproct, ml = main lobe of penes, sl = secondary lobe).

FIGURES 171 – 175. Male imago, general view, dorsal: 171, C. povilla sp. nov.; 172, C. lucidus; 173, C. demeni sp. nov.; 174, C. indivisus (from Alegre); 175, C. inusitatus sp. nov.

FIGURES 35 – 50. Campsurus essequibo, imago. Holotype male genitalia: 35, general v. v.; 36, detail of penes, v. v. Female adult: 37, abdominal sternum VIII; 38, detail of sockets. Male imago: 39 – 42, genitalia, variations, v. v.; 43, genitalia after treatment with KOH; 44 – 47, genitalia, variations, l. v.; 48, male mesofurcasternum. SEM photographs: 49, genitalia, v. v. (with detail of microlepides); 50, detail of penes, v. v.