Campsurus jorgenseni Esben-Petersen

Emmerich, Daniel & Molineri, Carlos, 2011, A new species of Campsurus (Ephemeroptera: Polymitarcyidae: Campsurinae) from Argentina and Uruguay and redescription of C. evanidus and C. jorgenseni with new synonymies, Zootaxa 2965, pp. 51-60 : 58

Campsurus jorgenseni Esben-Petersen

Campsurus jorgenseni Esben-Petersen, 1912: 333 ; Ulmer, 1920: 116; Lestage, 1923: 122; Needham & Murphy, 1924:16; Ulmer, 1942: 114; Traver, 1950: 593; Domínguez et al. 2006: 572.

Campsurus scutellaris Needham & Murphy, 1924: 19 ; Traver, 1947: 380; Domínguez et al. 2006: 578. NEW SYNONYM

Type material. Campsurus scutellaris holotype male ( CUIC nº 621) from Argentina, Iguazu falls, 22/I/1919, J.C. Bradley col.

Additional material. Four male imagos, Brasil, Mato Grosso do Sul, Chapadão do Sul, Fazenda Pedra Branca, Río Sucuriú, S 19º 15' 23.9" W 52º 47' 22.9", 8/VI/2008, Karina Righi col. (2 males housed in MZSP and 2 males in IML); 13 male and 2 female imagos, Mato Grosso do Sul, Ivinheima, 5/V/2005, S. M. Melo col. (7 males and 1 female housed in MZSP; 6 males and 1 female in IML)

Male imago. Body, 7.7–9.8 mm; fore wing, 7.3–9.0 mm; hind wing, 3.1–4.3 mm; foreleg, 3.3–4.2 mm; cerci, 20.0– 22.5 mm. General coloration whitish to brownish. Head ( Fig. 41 ) shaded widely with black, paler on occipute; antennae grayish light-brown. Thorax ( Fig. 41 ). Pronotum completely shaded with black, becoming paler posteriorly; pronotal hump translucent, presternum pale. Meso- and metanotum yellowish brown shaded with purplish black on carinae, more diffusely on sclerites; meso-and metasterna paler, not shaded. Legs yellowish. Fore coxae with a pair of black marks, fore femur, tibia and first tarsite shaded with brownish gray; legs II and III yellowish shaded slightly with gray. Wings. Membrane hyaline; Fore wings ( Fig. 44 ) with veins C, Sc and R1 tinged with purplish brown on basal half, other longitudinal veins light brownish basally turning translucent apically, remaining veins translucent; hind wing ( Fig. 45 ) shaded with purplish brown at base. Abdomen yellowish light brown widely shaded with gray and black dorsally as in figures 42–43; sterna with shading more restricted to lateral areas, with a pair of submedian black spots on sternum I. Genitalia ( Figs 49–52 ) brownish white except penean arms yellowish translucent. Caudal filaments whitish translucent, except light brownish at basal annuli.

Female imago. Body, 7.2 (empty)–9.7 (with eggs) mm; fore wing, 9.0 mm; hind wing, 3.0– 3.3 mm; cerci, 2.5– 2.8 mm. Only females from the paler population were studied. General color whitish, shaded gray as in male described above ( Figs 46–47 ). Abdomen shaded more strongly on rear segments ( Fig. 47 ). Sternum VIII with a median pair of subcircular sockets near anterior margins ( Fig. 48 ).

Eggs. Maximum length, 300–325µm; maximum width, 235–245 µm yellowish white, bowl shaped, oval, with a relatively large polar cap situated at the apex of the convex surface (minor axis) ( Fig 56 A).

Diagnosis and discussion. Campsurus jorgenseni can be distinguished from all other species of the genus by the following combination of characters: 1) posterior margin of male abdominal sternum IX straight to slightly convex ( Fig. 49 ); 2) pedestals subrectangular, outer-posterior margin strongly projected, inner margin less projected and with small strong setae ( Fig. 51 ); 3) penes widely separated distally, each arm formed by a large sclerotized lobe, and a shorter ventral membranous lobe ( Figs 49–50, 52 ); 4) small size (fore wings 7.3–9.0 mm); 5) blackish pigments on head and pronotum uniformly distributed, darker on anterior ring of pronotum ( Figs 41, 46 ); 7) abdominal color pattern as in figures 42–43; 8) female sternum VIII with paired contiguous oval sockets on anterior margin ( Fig. 48 ).

Campsurus scutellaris was described by Needham & Murphy (1924) from male imagos from Iguazu Falls, a locality near to, and in the same river, as that of C. jorgenseni Esben-Petersen (1912) . Needham & Murphy separated both species because C. scutellaris presented one pair of pale roundish spots in the brown on the dorsum of the middle abdominal segments, while C. jorgenseni showed two pairs. Traver (1947) stated that the male genitalia of both species were identical, but did not formally synonymyze them. We studied type material of C. scutellaris (CUIC) and compared it to original description and figures of C. jorgenseni . Neither species can be distinguished based upon morphological characters. We here propose C. scutellaris as a junior subjective synonym of C. jorgenseni . Three pictures of the genitalia of the type material mentioned above are provided for comparison ( Figs 53–55 ).

Distribution. Originally described from NE Argentina (Misiones). It is recorded for the first time from Brazil (Mato Grosso do Sul).

Figures

FIGURES 56 (A – C). Eggs and Polar Caps (Schematic drawing). A, Campsurus jorgenseni; B, Campsurus vulturorum; C, Campsurus evanidus.

FIGURES 41 – 55. Campsurus jorgenseni. Imagos. Male. 41, head and thorax, d. v; 42, abdomen, d. v; 43, abdomen, l. v; 44, Fore wing; 45, Hind wing; Female. 46, Head and thorax, d. v; 47, abdomen, d. v; 48, Sternum VIII sockets, v. v; Male. 49 – 50, Genitalia, v. v; 51, pedestal detail, v. v; 52, penes detail, v. v; 53 – 54, Holotype genitalia of C. scutellaris, v. v; 55, pedestal and penis details, ventrolateral view.