Tortopsis canum, Gonçalves & Da-Silva & Nessimian, 2011

Gonçalves, Inês C., Da-Silva, Elidiomar R. & Nessimian, Jorge L., 2011, First record and new species of Tortopsis Molineri, 2010 (Ephemeroptera, Polymitarcyidae) from Brazil, Zootaxa 2866 (1), pp. 50-54 : 51-53

Tortopsis canum sp. nov. Gonçalves, Da-Silva & Nessimian

Imago

Diagnosis. 1) Head strongly shaded with black between ocelli; head and pronotum color pattern as in Figs. 1 – 2; 2 ) forewing length: male— 11.3 – 12.7mm; females—15.0 – 17.0mm; 3) wings hyaline with veins C, Sc and R 1 grayish on basal 3/4; 4) parastyli long and straight or only subtly curved ( Fig. 10 ); 5) penes long, slender and cylindrical, apically hooked ( Fig. 9 – 11 ); 6) female parastyli receptors “C” shaped, receptors large, occupying nearly all extension of sternum VIII (Figs. 12 – 13).

Description. Male imago: Length (mm): 11.0 – 13.0 body; 11.3 – 12.7 forewing; 5.0 – 5.2 hind wing. General coloration thorax yellowish and abdomen whitish suffused with gray and black.

Head ( Fig. 2 ): Yellowish; anterior margin whitish. Head heavily suffused with black; base of ocelli and area between the ocelli nearly completely black. Ocelli white. Eyes black. Scape and pedicel white shaded with gray; flagellum translucent.

Thorax: Pronotum yellowish white; anterior hump translucent white. Color pattern as in Fig. 2 . Meso and metanotum yellowish suffused with black, particularly among suture lines of mesonotum. Prosternum translucent white. Meso and metasternum yellowish, both with blackish marking on median region; marking longer on mesosternum; mesofurcasternal plates approximating each other on anterior half, with mesofurcasternal impression narrow on that half and wide on posterior half.

Legs: Fore leg: coxa, trochanter, femur and tibia yellowish; femur and tibia heavily shaded with gray, with an apical marking on femur. Tarsomeres translucent white heavily suffused with gray, shade becoming more fainted toward apical segments. Tarsal claws white. Mid and hind legs: yellowish, femur and tibia shaded with gray.

Wings ( Figs. 5 and 7 ): Membrane hyaline; base of wings gray. Fore wing: veins C, Sc and R 1 gray, whitish on apical third, membrane of wing in this region also whitish. Remaining veins translucent-white. Hind wing: veins C and Sc gray on basal half; vein R 1 gray only at base.

Abdomen ( Fig. 4 ): Whitish with longitudinal medial line translucent white; terga I – VII shaded with gray, except for median line. Tergum VIII heavily shaded obstructing median line; terga IX – X heavily shaded with black or a darker gray, without median line. Sterna translucent white with lateral swellings yellowish; sterna suffused with gray medially; sterna VII – IX heavily suffused. Sterna VIII – IX more heavily suffused. Sternum IX entire with posterior margin and a pair of lateral lines black. Caudal filaments translucent white.

Genitalia ( Figs. 9 – 11 ): Translucent white; parastyli light brown. Parastyli straight or at most only subtly curved; forming an angle of about 45 o in relation to penes.

Female imago: Length (mm): 11.5 – 12.5 body; 15.0 – 17.0 forewing; 6.0 – 7.2 hind wing. General coloration yellow suffused with black.

Head ( Fig. 1 ): Yellowish; anterior margin whitish. Head heavily suffused with black; base of ocelli and area between the ocelli nearly completely black. Ocelli white. Eyes black. Scape and pedicel white shaded with gray; flagellum translucent.

Thorax: Yellow; Pronotum with anterior ring heavily suffused with black, color pattern as in Fig. 1 . Meso and metanotum heavily shaded with black; particularly among suture lines of mesonotum. Prosternum yellow lightly suffused with black. Meso and metasternum yellow heavily suffused with black on median region, forming blackish markings medially. Mesofurcasternal plates approximating each other on anterior half, with mesofurcasternal impression narrow on that half and wide on posterior half.

Legs: Yellow; with black shade on femur and tibia; foreleg heavily shaded.

Wings ( Figs. 6 and 8 ): Membrane hyaline. Forewing: veins S, Sc and R 1 gray on basal 3/4; whitish on apical fourth; membrane on this region also whitish. Hind wing: vein C and Sc gray on basal half; vein R 1 gray only at base.

Abdomen ( Fig. 3 ): Yellow; when without egg, abdomen translucent white. Terga heavily suffused with black. Sterna suffused with black particularly on lateral swellings. Sternum VIII with lateral C-shaped parastyli receptors; outer margin of parastyli receptors shaded black posteriorly. Parastyli receptors large, occupying nearly all the extension of the sternum VIII. Eggs light yellow, bowl-shaped; without polar caps or any attachment structures. Caudal filaments translucent white.

Nymph: Unknown.

Biology. Specimens of Tortopsis canum sp. nov. were found near a deep, large river (6 th order), with sandy bottom. Adults were found flying near the Macaé river, on a strongly modified segment, where the Macaé river is rectified and riparian vegetation is lacking. In the same localities adults of Campsurus melanocephalus Pereira & Da- Silva, 1991 were also collected. Campsurus melanocephalus appeared in large numbers (about 70% of all Polymitarcyidae ) in light traps whereas T. canum sp. nov. occurred in smaller numbers (30%).

Specimens were captured in light traps. Swarms began around 6:00 – 7:00 PM , with few males flying, then reached its highest abundance and ended before 8:00 PM. Etymology. “ canum ”, from the Greek , meaning “straight rod”, in reference to the straight parastyli of males. Type material. Holotype: Brazil, RJ, Macaé , Cachoeiros de Macaé , Rio Macaé , 05-IV-2009, 22 o 25'49.5''S / 42 o 18'06''W, 68m, Gonçalves, I.C. leg. 1 male imago ( DZRJ1626 ); Paratypes: Brazil, RJ, Macaé : Cachoeiros de Macaé , Rio Macaé , 05-IV-2009, 22 o 25'49.5''S / 42 o 18'06''W, 68m, Gonçalves, I.C. leg. 1 male imago and 5 female imagos ( DZRJ1627 ); Macaé , Rio Macaé , 16-IV-2009, 22 o 17'42.9''S / 41 o 52'48''W, Gonçalves, I.C. leg. 17 male imagos and 5 females imagos ( DZRJ1628 ); Macaé, Rio Macaé, 16-IV-2009, 22 o 17'42.9''S / 41 o 52'48''W, Gonçalves, I.C. leg. 1 male imago ( DZRJ1629 ) .

Figures

FIGURES 1–4. Tortopsis canum sp. nov. Imago. 1—Head and pronotum of female; 2—Head and pronotum of male; 3— Abdominal color pattern of female; and 4—Abdominal color pattern of male (scale: figs. 1–2: 1.0mm and figs. 3–4: 5.0mm).

FIGURES 5–11. Tortopsis canum sp. nov. Imago. 5—Male forewing; 6—Male hind wing; 7—Female forewing; 8—Female hindwing; 9—Detail of penes; 10—Male genitalia (lateral view); 11—Male genitalia (ventral view); 12—Detail of female parastyli receptors; and 13 – Female VIII sternum (scale: figs. 5 and 7: 5.0mm; figs. 6 and 8, 10–11 and 13: 0.1mm; figs. 9 and 12: 0.5mm).