Oedematopiella nathaliae, Naglis, Stefan M., 2011

Naglis, Stefan M., 2011, Revision of the genus Oedematopus (Diptera, Dolichopodidae) with the description of a new genus and a key to the Neotropical genera of Hydrophorinae, Zootaxa 2756, pp. 40-52 : 50-51

Oedematopiella nathaliae sp. nov.

( Fig. 8 )

Type material. HOLOTYPE ɗ: “CR, Puntarenas, Monteverde, 23.-27.II. 1991, B.J. Sinclair” [ CNC]. PARA- TYPES: 3 ɗ, 2 Ψ, same data as holotype [ CNC].

Description. Male. Length (holotype): body 4.2 mm, wing 4.6 mm; thorax 1.5 mm, abdomen 2.2 mm. Head: Face and clypeus with dense silvery-white pruinosity, ratio narrowest distance between eyes to distance between ocellar setae = 3.2; ratio high of face and clypeus to narrowest distance between eyes = 3.9; palpus narrow and pointed, dark with silvery-white pruinosity and brown hairs, with 2-3 strong apical setae; antenna dark brown; scape about twice as long as pedicel; pedicel about as long as high; first flagellomere ovate and about as long as high; arista dorsal and bare; frons with brown pruinosity above antennae; vertex dark metallic green; pair of strong ocellar, and pair of small postvertical setae present; upper postoculars short and uniseriate, lower long, pale and multiseriate. Thorax: Mesonotum metallic green with violet reflections, with brown pruinosity, and with silverywhite pruinosity on area of postpronotal lobe; ac absent; 6 strong dc present decreasing in size anteriad; scutellum with pair of strong setae, but without smaller additional setae; pleuron with dense grayish pruinosity; propleuron with fine pale hairs. Legs: Mostly dark brown, FI on basal 1/3, FII on basal 3/4, and FIII on basal 1/2 yellow; CI with pale hairs and some apical setae; FI with av row of short setae on basal 2/3; TI with ad/pd pair at about 1/4 and 1/2; It 1 in apical third broadened; It2 strongly curved basally and U-shaped, compressed and broadened, about 1.5 times as wide as It3, ventrally with field of minute hairs (MSSC); It3-5 with small ventral setae; FII with ventral row of 3–4 strong setae at middle which are about 3 times as long as diameter of femur (MSSC); TII with ad/pd pair at about 1/8 and 1/2; FIII with ventral row of strong curved yellow setae along entire length, longer than diameter of femur (MSSC), TIII with ad/pd pair at about 1/8 and 2/3. All claws well developed, pulvilli absent. Relative podomere ratios: I: 54:55:26:13:5:5:6; II: 57:70:43:21:5:4:5; III: 77:84:34:34:15:6:8. Wing: With brownish tinge; R4+5 and M converging before wing apex; cross-vein dm-cu at acute angle to posterior wing margin; RMx ratio: 2.8; CuAx ratio: 3.0; lower calypter pale yellow with fan of brown setae; halter pale yellow. Abdomen: Dark metallic green with brown pruinosity; sternum 4 with dense apical hairs, lateral ones not longer than medians, segment forming hood for partially enclosing hypopygium. Male genitalia ( Fig. 8 ): with 2 narrow epandrial lobes, lateral lobe with 2 small setae, median lobe bare and shorter; Vsur very small and narrow, with 1 small apical seta; Dsur with two lobes, lateral lobe W-shaped and pointed apically; cercus with two arms: lateral arm rounded, median arm with black flattened setae. Female: Face wider, yellow coloration on femora more extended.

Etymology. The new species is named after my daughter Nathalie.

Remarks. Oedematopiella nathaliae is very similar to O. sarae , but can be differentiated by the characters given in the key. Both species occur in Costa Rica and they are most probably sister-species. Regarding the distribution it should be noted that Costa Rica has been well collected and therefore has many species of the Oedematopus genus group, including the only records of Oedematopiella . The fauna of Oedematopus and Oedematopiella is undoubtedly much more diverse but uncollected. There needs to be a focus on stream collecting.

Figures

FIGURE 8. Oedematopiella nathaliae sp. nov., male genitalia, left lateral view (scale bare = 0.1 mm).