Haplohyphes yanahuicsa, Molineri, Carlos, 2003

Molineri, Carlos, 2003, Haplohyphes (Ephemeroptera: Leptohyphidae), new species and stage descriptions with a key to separate the species of the genus, Zootaxa 263, pp. 1-11 : 6-8

Haplohyphes yanahuicsa sp. nov. ( Figs. 20­41, 46­47 )

Male imago. Length: 4.0­ 4.2 mm; fore wings, 3.7­3.9 mm. General coloration yellowish white, last segments of abdomen blackish. Head shaded with brownish gray from a transverse line at the median ocellus to posterior margin; antennae yellowish white. Thorax. Pronotum whitish translucent shaded almost completely with brownish gray, meso­ and metanotum whitish yellow with few very light gray marks; pleurae and sterna whitish yellow translucent shaded with light brownish on pro­ and mesopleurae and with gray in thoracic sterna. Legs: coxae I and II, fore femora and apex of fore tibiae and fore tarsi shaded with brownish gray, remaining segments of all legs whitish. Wings ( Figs. 20 a­c): membrane of wings hyaline, fore wings shaded with gray on C and Sc area, basally to bullae; longitudinal vein grayish, cross veins paler; hind wings only with two longitudinal veins. Abdomen ( Fig. 46 ) whitish translucent shaded with blackish gray on terga, shaded very slightly on first segments and becoming darker and more extensive toward rear segments (segments VI­IX are much darker than the rest of body). Genitalia ( Figs. 21­24): yellowish white shaded with gray on margins of styliger plate and forceps. Caudal filaments hyaline shaded with gray, except at joining.

Female imago. Unknown, but two mature female nymphs ready to moult ( Fig. 47 ) show the same characteristic coloration of the male imago.

Nymph ( Fig. 47 ). Length: body, 5.0­ 5.1 mm; mesonotum, 1.5 mm; hind femora, 1.0 mm. General coloration whitish yellow with blackish marks. Head yellowish white surrounded by thick yellowish setae; shaded with blackish gray on a transversal band between eyes; occipute shaded more slightly with a reticular pattern; antennae whitish translucent; mouth parts whitish. Mouthparts as in Figs 30­35. Thorax whitish yellow, pronotum shaded extensively with blackish gray, mesonotum shaded more slightly; wing buds shaded with black on basal half of costal margin. Thoracic sterna shaded with gray, metanotum and pleurae without shading. Legs ( Figs. 26­28) whitish shaded with gray on coxae I and II; tarsal claws with double row of submarginal denticles near apex ( Fig. 29). Abdomen ( Fig. 47 ) yellowish white shaded with light gray on terga I­IV (sometimes also on V) and shaded with blackish gray on terga VI­IX (sometimes also on V); tergum X slightly shaded with gray. Abdominal sterna paler shaded very slightly with gray. Opercullar gill ( Figs. 36­37) whitish translucent shaded completely with light gray, remaining gills ( Figs. 38­41) whitish translucent. Caudal filaments whitish yellow with whorls of setae at each joining.

Etymology. Combination of letters including the Quechua voices “yana” (=black) and “huicsa” (=abdomen).

Material. Holotype male imago from BOLIVIA: Dept. La Paz, stream between Caranavi and Guanai, S 15° 40' 18" ­ W 67° 42' 04", 500 m, 27/XI/2000, E. Domínguez, C. Molineri y C. Nieto Cols. Paratypes: 3 male imagos and 2 female mature nymphs, same data as holotype. Holotype, 1 paratype male imago and 1 paratype nymph housed in UMSA; remaining material in IFML. Nymphs and adults are associated by a pharate subimago.

Discussion. Haplohyphes yanahuicsa sp. nov. can be distinguished from the other species of the genus by the following combination of characters. In the imago: 1) hind wings with two longitudinal veins ( Fig. 20 c); 2) segment 1 and 2 of forceps similar in length ( Fig. 24); 3) penes divided on apical 0.22 ( Figs. 23 a­b); 4) membranous lobes of penes rounded ( Fig. 23 a­b); 5) distal spines of penes shorter than membranous lobes; 6) male fore wing length: 4.0 mm; 7) general coloration pale except apical segments of abdomen blackish ( Fig. 46 ). In the nymph: 1) markings on head not reaching base of antennae ( Fig. 25); 2) abdomen shaded with blackish on rear segments ( Fig. 47 ).

Figures

FIGURES 46 - 47. Haplohyphes yanahuicsa sp. nov.: 46, general view of male imago; 47, general view of nymph.