Varipes helenae Salles & Batista

Salles, F. F. & Batista, J. D., 2004, The presence of Varipes Lugo­Ortiz & McCafferty (Ephemeroptera: Baetidae) in Brazil, with the description of a new species, Zootaxa 456, pp. 1-6 : 2-3

Varipes helenae Salles & Batista , sp. n.

Larvae. Body length: 3.4–4.0 mm. Caudal filaments length: 1.4 mm.

Head yellow­brown, with no distinct color pattern. Ocelli dark brown. Labrum (Fig. 1) with anterior margin with median row of robust, branched setae, followed laterally by fine and long simple setae; dorsal surface with three submarginal fine, long, simple setae on each side of midline, and one pair of fine, long, simple setae on each side of midline, located more posteriorly. Hypopharynx as in Figure 2. Left mandible (Fig. 3) with outer and inner set of incisors respectively with four and two denticles; prostheca robust; triangular process at base of mola well developed. Right mandible (Fig. 4) with outer and inner set of incisors respectively with three and four denticles; prostheca bifid, relatively well developed. Maxillae (Fig. 5) with robust, spiniform seta on medial hump; palps two­segmented; palpifer relatively long; segment 2 nearly 0.5x length of segment 1. Labium (Fig. 6) with glossae with four to five short, fine, simple setae medially, and two to three long, fine, apically branched setae distally; dorsum of paraglossae with apical row of long, fine, apically branched setae, and ventrally with a group of three short, fine, simple setae; segment 2 of labial palp with rounded distomedial process, inner margin with long, fine, simple setae, and dorsally with two long, fine, simple setae.

Thorax yellow­brown, except for the tips of the fore wing pads, medium brown; without distinct pattern. Hind wing pads absent. Legs ( Figs. 7–10 ) pale yellow­brown; fore femora ( Fig. 7 ) broader than others, with submedial row of long, robust, simple setae, increasing in size ventrally; dorsally with row of short to long, robust, simple setae; anterior half of ventral margin with long, robust, simple setae, and short and stout simple setae; mid femur ( Fig. 9 ) with anterior row of long, robust, simple setae; hind femur ( Fig. 10 ) with relatively few setae; tibia and tarsi almost bare, except for a few short, fine, simple setae dorsally, and a few short, stout, simple setae ventrally; tarsal claws ( Fig. 8 ) with four to five denticles on lateral and medial margins.

Abdomen pale yellow­brown, except for segments 2, 7, and 8, medium brown; without distinct pattern. Terga ( Fig. 11 ) with posterior triangular spines absent in segments 1– 3, segments 4–7 with triangular spines restricted laterally, and segments 8–10 with triangular spines along the posterior margin. Gills as in Figure 12 , whitish and weakly tracheated. Paraproct ( Fig. 13 ) marginally with six to seven spines. Caudal filaments whitish. Adults. Unknown.

Type material. Holotype: Female nymph, Brazil, Mato Grosso, Córrego Taquaral, 15° 42.44'S / 52° 20.44'W, 04/VI/2003, J. D. Batista. Paratypes: three nymphs, same data as holotype. All types are housed in the Coleção de Invertebrados, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil.

Etymology. The specific epithet is in honor of professor Helena Soares Ramos Cabette, our colleague in the field of entomology, and adviser of the second author.

Varipes helenae , sp. n., nymph. 1. Labrum (dorsal). 2. Hypopharynx. 3. Left man­

dible. 4. Right mandible. 5. Maxilla. 6. Labium (left–dorsal; right–ventral).

Figures

FIGURES 7 – 13. Varipes helenae, sp. n., nymph. 7. Foreleg. 8. Detail of tarsal claw. 9. Mid femur. 10. Hind femur. 11. Tergum 4 (detail of posterior margin). 12. Gill 4. 13. Paraproct.