Oedematopiella nathaliae Naglis, 2011, sp. nov.
Creators: name: Naglis, Stefan M.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Oedematopiella
Oedematopiella nathaliae

description: 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.
description: Published as part of 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, pp. 40-52 in Zootaxa 2756 on pages 50-51, DOI: 10.5281/zenodo.201012