Eratomyia risaralda, Amorim, Dalton De Souza & Falaschi, Rafaela Lopes, 2010

Amorim, Dalton De Souza & Falaschi, Rafaela Lopes, 2010, A second known species of Eratomyia Amorim & Rindal (Diptera, Rangomaramidae, Chiletrichinae) from Colombia, Zootaxa 2641, pp. 55-61 : 56-57

Eratomyia risaralda , sp. n.

(Figs. 1–4)

Diagnosis. Wing membrane with a light brown macula over the base of Rs and r-m, and another one over the base of the medial fork. Male abdominal tergite 3 yellow.

Material examined. Holotype, ɗ, Colombia, Risaralda SFF, Otún Quimbaya, El Molinillo, 04º43’S 75º34’W, 2220 m 17.ii–04.iii.2003, G. López leg. (types located in the IAvH). Paratypes. 3 Ψ, same data as holotype (one female paratype in the MZUSP collection).

Description. Total body length, 3.4 mm. Wing length, 4.5 mm.

Male. Head. Scape and pedicel dark yellow, flagellum light brown, 14 flagellomeres; first flagellomere more than 1.5 longer second flagellomere, dark yellow at the very base; flagellomeres much longer than wide, with scattered setulae, decreasing in length to apex, last flagellomere digitiform. Three ocelli close together, middle ocellus smaller than lateral ocelli, occiput dark brown. Frons light brown, with few setulae; face and clypeus yellow. Palpus with palpiger bare and four light yellow, setose palpomeres, gradually longer to the apex. Labella yellow. Thorax. Scutum and scutellum shining blackish brown. Two rows of longer dorsocentral setae, next to an irregular row laterally, entirely bare over the remaining scutum; a single, irregular row of scutellar setae. Pleural sclerites shining dark brown, except katepisternum, with a silvery pruinose band; proepisternum with few setae, no antepronotal setae and a single seta on postpronotum, basisternite with a group of anterior setae. Mesepimeron and metepisternum with a group of setae, laterotergite and mediotergite bare. Halter dark yellow. Legs. Coxae mostly yellow, mid coxa with brown elongate meron, hind coxa brown at proximal margin, trochanteres yellow with brownish areas, femora yellow, hind femur brownish at base and at apex, tibiae ochre-brown, brown to apex, tarsi brown, dark brown to apex. Tibial spurs 1-2-2, spurs brown, length about 1.5 x apex of tibiae. Wing (Fig. 1). Membrane with a brownish macula on the first sector of Rs and at base of medial fork; Wing membrane with microtrichiae present, and macrotrichia absent, setae on all veins except CuP and A1. Sc long, but incomplete, reaching basal third of wing. R1 long, reaching C beyond distal third. R5 reaching C just before wing apex, running quite apart from R1; r-m slightly shorter than first sector of Rs. Basal cell wide; bM about twice r-m, almost longitudinal; m-cu slightly longer than bM; first sector of CuA more than half length of second sector of CuA; CuP well sclerotized; A1 incomplete, weakly sclerotized, close to CuP (not actually perceptible in Fig. 1); anal lobe reduced. Abdomen. Tergites dark shining brown, except tergite 3, yellow; sternites light brown in the middle, yellowish to the lateral margins, except for sternite 3, entirely yellow. Tergites wider than sternites. Terminalia. ( Figs. 2–3 ). Terminalia yellow, except for the brown inner projection of gonocoxites and distal projection of tergite 9. A posterior incision on the syngonocoxite, sternite 9 not visible as an independent plate; each gonocoxite with a distal digitiform projection more sclerotized than the rest of the terminalia, bearing some strong spines, a short digitiform projection with setae behind each of these stronger gonocoxite projections; gonostyle clavate, base much wider than apex; aedeagus wide, blunt at apex; tergite 9 with a pair of wide distal, more strongly sclerotized projections, with a number of elongated black spines; cercus visible, lobate.

FIGURE 1. Eratomyia risaralda , sp. n., female paratype. Wing. An arrow shows a teratological spur on R5.

Female. Total body length, 4.3–4.5 mm. Wing length, 4.5–4.7 mm. A teratological spur is present in one of the wings of a female paratype (Fig. 1). Abdominal tergites and sternites brown, except for the yellow tergites and sternites 3 and 5. Tergite and sternite 7 well developed. Terminalia ( Fig. 4 ). Terminalia brown, cerci yellow. Sternite 8 deeply modified, wide, with a pair of digitiform projections mesally in the anterior margin, with a pair of lateral rows of golden, elongated hairs. Sternite 9 short anteriorly, not Y-shaped. Tergites 9 and 10 short. A broad basal cercomere and a long distal cercomere more than twice the preceding one. Spermathecae not observable in any of the specimens.

Etymology. The species epithet refers to the type-locality and is a noun in apposition.

Figures

FIGURE 4. Eratomyia risaralda, sp. n., paratype. Female terminalia. Abbreviations: ce 1, basal cercomere; ce 2, distal cercomere; S 8, sternite 8; S 9, sternite 9; S 10, sternite 10; T 8, tergite 8; T 9, tergite 9; T 10, tergite 10.

FIGURES 2 – 3. Eratomyia risaralda, sp. n., holotype. Male terminalia. 2. Ventral view. 3. Dorsal view. Abbreviations: ae, aedeagus; ce, cercus; dp, distal projection of gonocoxite; ga, gonocoxal apodeme; gc, gonocoxite; gs, gonostylus; T 9, tergite 9.