Campsurus nessimiani, 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 : 314-317

Campsurus nessimiani sp. nov.

( Figs. 54–55 , 60–67 , 166 )

Type material. BRAZIL: holotype ♂ i from Amazonas, Barcelos , rio Demeni , boca do rio, 8–9.viii.2009, S 0° 25' 29" / W 62° 54' 20", pennsylvania light trap , N Hamada col. ( CZNC). Paratypes: 50 ♂ i and 4 ♂ si same data as holotype ( CZNC, except 5 ♂ i in IBN) ; 5 ♂ i from Amazonas, N. Aripuanã, Rio Juma, Ig. Campineiro Gde. , 8– 9.ix.2004, pennsylvania light trap, N Hamada col. ( CZNC) ; 2 ♂ i from Amazonas, Manaus, Arquipélago de Anavilhanas , N 2° 40' 20" / W 60° 46' 40", 30.vii.2000, light-trap, JL Nessimian col. ( CZNC) ; 1 ♂ i same data as before except date (31.vii.2000) (IBN) ; 1 ♂ i from Roraima, Boa Vista, rio Cauamé , N 2° 49' 11" / W 60° 40' 24", 28.ii.2003, UV light trap , N Hamada col. ( CZNC); 13 nymphs (2 are pharate ♂ si) from Amazonas, Arquipélago de Anavilhanas, lago Siriri , 21.ix.1981 , JL Nessimian col. (CZNC, except 3 nymphs in IBN).

Male imago. Length (mm): body, 6.5–7.8; fore wing, 5.9–7.0; hind wing, 2.8–3.1; cerci, 16.0–18.5; fore leg, 2.9–3.5. General coloration whitish yellow ( Fig. 166 ). Head yellowish, completely shaded with black dorsally, except along hind margin and base of antenna ( Fig. 166 ). Antennae yellowish white, shaded with gray. Thorax ( Fig. 166 ). Pronotum translucent, anterior portion completely shaded with gray, except on anterior hump; posterior pronotal portion translucent, shaded with gray medially and on lateral zones; posterior margin grayish; transversal pale stripe between both portions; blackish longitudinal medial line present along both portions; prosternum and propleura pale, almost without shading. Mesonotum yellowish, shaded with black on thin blackish medial line, and shaded diffusely with gray almost completely but darker on parapsidal sutures and between PSP; pleura yellowish, shaded with black on area around spiracle and above coxa continuing to PLsS (superior pleural suture); sternum shaded with gray widely but slightly; inner margins of PFP grayish; metanotum yellowish, shaded widely with gray except pale anterolateral mark; metasternum yellowish translucent shaded with gray on medial marks. Legs. Fore leg yellowish white, shaded completely with purplish gray except pale lateral stripe on coxa, slightly paler at base of tarsomeres and apex of claws; middle and hind legs yellowish translucent, shaded very slightly with gray. Wings. Membrane hyaline except C, Sc, R1 areas shaded with gray; veins C through MA (and cross veins therein) shaded gray, darker on basal 2/3 of veins C, Sc and R1, lighter toward apex; other veins shaded gray only at base, rest translucent. Hind wing with base and Sc grayish, remaining veins translucent. Abdomen whitish translucent, shaded widely with gray on terga ( Fig. 166 ) except on intersegmental membranes and pale lateromedian dash on terga III–VII (some males also with pale mediolongitudinal line); terga VIII–X shaded more uniformly but with some pale spots and black dashes (black dashes forming anteromedian small "V" on tergum IX). Abdominal sterna yellowish white, shaded very slightly with gray on gill sclerites. Genitalia ( Figs. 54–55 ): sternum IX slightly shaded gray posteromedially, with truncated hind margin ( Fig. 54 ); pedestal of each side touching basally, with large apically rounded parastylus, inner corner also projected and round ( Figs. 54–55 ); forceps short and whitish; base of penes wide proximally, abruptly narrowing at distal half; main lobe of penes large and sclerotized, slightly curved ventrally and with apex spatulate, secondary membranous lobe large and conical. Caudal filaments translucent yellowish white.

Mature nymph. Length of male (mm): body, 8.0–9.0; cerci, 6.0; terminal filament 5.5. Head with frons completely covered with long setae, also on straight anterior margin, only one small blunt tubercle at base of antennae, another small blunt tubercle on anterolateral corner of frons (t in Fig. 60 ), anterior half of gena protruded and covered with very long, strong setae, posterior half of gena bare, except for small tubercle before eye also covered with very long, strong setae ( Fig. 60 ); inner margin of compound eye with a pair of setae anteriorly and another pair posteriorly. Antenna ( Fig. 60 ): pedicel almost twice as long as scape, dorsally covered with very long, strong setae; scape with few short setae; flagellum almost twice length of head capsule, scattered with very short, weak setae. Mandibular tusk ( Figs. 61–63 ) relatively long and slender, apex slightly curved inward; exposed area 0.5–0.6× length of head capsule; dorsal surface with numerous very long, strong setae; dorsal surface with group of 8–15 strong blade-like spines at base (bs in Fig. 62 ); outer margin covered with long setae and 28–34 strong bladelike spines (distally in single row, basally in double but scattered row); inner margin with 7–9 (left mandible) or 9– 11 (right mandible) small tubercles (becoming smaller toward apex), some alternating with short strong setae ( Figs. 61–63 ), these tubercles ordered in more or less straight row; ventral surface with many fewer setae than dorsum, only along outer margin. Maxilla without ventral gill. Thorax. Posterolateral corner of pronotum and propleura without strong setae; metasternum completely covered with strong setae. Legs ( Figs. 64–67 ). Femora of all legs relatively slender. Fore legs with coxa and trochanter bare; dorsal surface of femur ( Fig. 64 ) with outer subdistal row of setae, and subbasal group of long setae on inner margin, venter of fore femur ( Fig. 65 ) with group of filtering setae at base; tibia-tarsus with margins slightly curved, dorsal surface almost completely covered with short spines and long setae ( Fig. 64 ), ventral surface with 2 rows of filtering setae ( Fig. 65 ): basal transversal Wshaped row extending along ventral surface and hind margin, and U-shaped longitudinal row along fore margin; tibia-tarsus distally cleft, not strongly projected; tarsal claw apically curved and with row of about 20–25 minute denticles. Middle leg ( Fig. 66 ) with coxa and trochanter with setae; dorsal surface of femur covered with relatively few long setae, mainly along margins, ventral surface bare, except apex with row of long curved setae; tibia with anterior margin distally projected and with crown of strong spines, posterior margin completely covered with very long setae, anterior margin basally bare, distal 1/3 densely covered with thick, yellowish setae; tarsus, except for absence of crown of spines, similar in setation to tibia; tarsal claw long and slender, slightly curved when compared to fore tarsal claw, with row of 30–35 minute denticles. Hind leg ( Fig. 67 ) similar to middle leg, except for absence of crown of spines on tibia, dorsal surface of femur almost completely covered with weak setae and tarsal claw with row of 20–25 minute denticles. Abdomen. Lateral margins of all segments with row of long setae. Sterna I– VIII with few long setae on hind margin, sternum IX with medial row of long setae. Gills. Abdominal gill I bilobed, dorsal lamella almost 3× width and 1.3× length of ventral lamella. Cercus 0.7× length of body, covered with setae dorsally and ventrally, setae more numerous and longer on outer margin, decreasing in length and number toward apex. Terminal filament at least 0.6× length of body (broken at apex), more slender than cercus, covered completely with long, scattered setae.

Etymology. We are pleased to dedicate this species after Jorge Luis Nessimian, who collected much of the material studied in this work.

Distribution ( Fig. 179 ). Brazil (Amazonas, Roraima).

Diagnosis. Campsurus nessimiani can be distinguished from other species of Campsurus , in the adult stage, by: 1) posterior margin of male abdominal sternum IX truncate ( Fig. 54 ); 2) pedestals of each side almost touching basally, long and slender, well-developed, outer-posterior margin strongly projected forming long parastylus with rounded apex, inner margin also projected but shorter ( Fig. 54 ); 3) penes separated and converging distally, each arm formed by large dorsal sclerotized lobe with wide base, and relatively large ventral and apically rounded membranous lobe ( Fig. 54 ), apex of main lobe of penes spatulate ( Fig. 55 ); 4) small size (length of male fore wings 5.9–7.0 mm). In the nymph: 1) small single tubercle at base of antenna (t in Fig. 60 ), scape and pedicel with setae; 2) pre-ocular group of setae on gena arise from a slightly elevated area, inner margin of compound eye without row of long setae ( Fig. 60 ); 3) mandibular tusks ( Figs. 61–63 ) with apex slightly curved inwards, inner margin with 7– 11 small tubercles becoming smaller toward apex, outer margin with 28–34 strong, blade-like spines and long setae; 4) fore femur slender (max. width 0.36× max. length), fore tibia with slightly sinuous margins ( Figs. 64–65 ); 5) tarsal claws with a single row of 20–35 minute denticles.

Discussion. Campsurus nessimiani is very similar to C. cuyuniensis , C. dasilvai sp. nov. and C. zunigae sp. nov., but the male adults of C. nessimiani can be distinguished because they present long forceps (as in other species, except C. cuyuniensis with forceps as short as pedestals), they have a black mediolongitudinal line on pronotum (absent in C. dasilvai sp. nov.); the main lobe of penes of C. nessimiani ends in a spatulate structure (acutely pointed in C. dasilvai sp. nov.), and the parastylus is apically rounded (pointed in C. cuyuniensis and C. dasilvai sp. nov., in lateral view). The nymphs of C. nessimiani are similar to C. zunigae sp. nov., but they can be distinguished by: mandibular tusks with a group of 8–15 strong blade-like spines dorsally at base (bs in Fig. 62 , spines absent or reduced in C. zunigae sp. nov.), inner margin with 7–11 small tubercles in a more or less straight row (14–15 in a curved row in C. zunigae sp. nov.), posterolateral corner of pronotum and propleura without strong setae (with seta in C. zunigae sp. nov.), fore legs with coxa and trochanter bare (coxa with setae in C. zunigae sp. nov.), tarsal claw only with minute denticles (apical denticles are larger than the others in C. zunigae sp. nov.).

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).

FIGURES 60 – 67. Campsurus nessimiani sp. nov., nymph: 60, head, d. v.; 61, left mandible, outer lateroventral view (showing arc of filtering setae); 62, same, oclusal view; 63, right mandible, d. v.; 64, fore leg, d. v.; 65, same, schematic, v. v.; 66, middle leg, d. v.; 67, hind leg, d. v.

FIGURES 163 – 166. Male imago, general view, dorsal: 163, C. latipennis; 164, C. salobra; 165, C. essequibo; 166, C. nessimiani sp. nov. Abbreviations: ap = anteronotal projection, mps = medio parapsidal suture, ph = pronotal hump, psp = posteroscutal protuberances.