A new species of Pseudatrichia Osten Sacken (Diptera: Scenopinidae) from North America Author Winterton, Shaun L. text Zootaxa 2009 2094 36 41 journal article 10.5281/zenodo.187585 8443e68b-5cec-4cf8-997c-b7dc76e7457e 1175-5326 187585 96ADAF05-D2FD-4B47-A121-542AFB1B3101 Pseudatrichia bezarki sp. nov. urn:lsid:zoobank.org:act:1C82C4FB-C439-4423-BBB0-75FAEA157AC2 ( Figures 1–4 ) Type Material. Holotype male, UNITED STATES : Arizona: Coconino County: Oak Creek Canyon, [ 14.5 km ] S Flagstaff, on highway, [ 2010m ], L. Bezark, J. Cope, C. Kitayama & R. Morrison, [35.067º, -111.684º]; emerged March 1975 ; reared from Pinus sp. ( CASC ). Paratype : female, same data as holotype ( CASC ). Diagnosis . Wing hyaline in both sexes; haltere stem dark, knob white except for brown base; distiphallus apically broad and spatulate with posteroventral lobes; gonostylar setal brushes not extending beyond posterior margin of gonocoxites; female sternite 8 medially emarginate posteriorly. FIGURE 1. Pseudatrichia bezarki sp. nov. : Holotype male, lateral. Body length= 4.8 mm. Description. Body length, male: 4.8 mm ; female 4.4 mm . Head . Glossy black ( Figures 1–3 ); frons profile not protruding anteriorly beyond eye, males with eyes almost contiguous at narrowest point, frons much wider in female; face black, parafacia narrow, glabrous; mouthparts relatively small, but apparently functional, brown; antenna tan-brown, overlain with silvery pubescence, admixed with short dark setae on scape and pedicel; ocellar tubercle flat, overlain with silvery pubescence; postocular ridge very narrow, with minute setae laterally but lacking macrosetae; occiput relatively flat to concave dorso-medially, slightly verrucous; gena sparsely covered with fine brown setae. Thorax . Glossy black, scutum finely verrucous, sparsely overlain with short pale setae; postpronotal and pteropleural ridges with small pale tan areas; pleuron smooth and glabrous, except for a few sparse fine setae; coxae and legs pale yellow except for dark brown apical ¼ of hind femur and base of hind tibia; coxae overlain with silver-white pubescence; pale setae on legs; haltere stem and base of knob dark brown, rest of knob bright white; wing hyaline, venation dark yellow. Abdomen . Glossy black, cylindrical; pitted verrucous over entire surface, overlain with sparsely distributed short pale setae; intersegmental membranes of segments 2-3 white with matt black region medially. Male genitalia ( Figure 4 A-B). Epandrium shape ‘tulip’-like in dorsal view, with posterior margins flared laterally, halves not completely enclosing gonocoxites; cerci narrow and apicies bent medially; gonocoxite with triangular processes along dorsal surface; gonocoxal apodeme relatively broad; hypandrium apparently fused to gonocoxites posteriorly; gonostyli as rounded sclerites covered with densely arranged posteroventrally directed brushes of large setae; distiphallus spatulate apically with medial recurved processes and lateral lobes, posterior surface of distiphallus covered with minute spines; ventral apodeme forked, arms rounded; ejaculatory apodeme small, narrow. Female genitalia ( Figure 4 C). Sternite 8 red brown, posterior margin hemispherically emarginate, acutely rounded medial process within this margination; cercus directed medially towards apex, sheathed basally. FIGURE 2. Pseudatrichia bezarki sp. nov. : Paratype female, lateral. Body length= 4.4 mm. FIGURE 3. Pseudatrichia bezarki sp. nov. : Holotype male, head lateral. Comments. Pseudatrichia bezarki sp. nov. is closely related to P. punctulata Hardy and P. rufitruncula Kelsey sharing characters such as lateral processes on the apex of the distiphallus, ‘tulip’-shaped epandrium, emarginate sternite 8 in female and medially directed cerci in both sexes. This species can be easily diagnosed by the distinctively shaped distiphallus and the shape of female sternite 8. Unfortunately the number of unassociated males and females described in this genus makes it likely that at least some species may represent the male and female of a single species. The conservative external morphology of adult Pseudatrichia makes it difficult to assess the status of these species based on singular unassociated sexes and will require use of differing characters such as DNA sequence data to test this further. The association of the different sexes in P. b e z a r k i sp. nov. is based on rearing data from a single collecting event, and it is most likely they represent the same species. Etymology. The specific epithet is named after Larry Bezark, one of the collectors of this species. To key out P. b e z a r k i sp. nov. the following couplets should be included in the dichotomous key by Kelsey (1969) , with reference to subsequent modifications by Kelsey (1971 , 1974 ): Males : 10 Antennae orange-brown........................................................................................................................................... 10a - Antennae back-brown .............................................................................................................................................. 10b 10a Seventh abdominal segment elongate, red-brown; 9th segment black-brown; gonostylar setal brushes extending to apex of distiphallus; distiphallus with paired, spiral-shaped, distal processes relatively long ... P. rufitruncula Kelsey - Seventh abdominal segment short, glossy black; 9th segment black; gonostylar setal brushes extending to middle of distiphallus; distiphallus with paired, spiral-shaped, distal processes relatively long ............... P. gracilipennis Kelsey - Seventh abdominal segment elongate, glossy black; 9th segment black; gonostylar setal brushes not extending posteriorly beyond end of gonocoxites; distiphallus with paired, distal processes curved and relatively short .................... ........................................................................................................................................................... P. bezarki sp. nov. 10b Vein R4 arising from middle of cell r5 .......................................................................................... P. unicolor Coquillett - Vein R4 arising from distal third of cell r5 .................................................................................... P. macalpeni Kelsey Female : 15 Vein R4 branching from just beyond the middle of cell r5........................................................................................ 15a - Vein R4 branching from near the distal fourth of cell r5 ...................................................................... P. c a j o n i Kelsey 15a Posterior margin of sternite 8 medially emarginate as in Figure 4 C; cerci directed medially ........... P. bezarki sp. nov. - Posterior margin of sternite 8 not emarginate; cerci parallel along entire length, not directed medially ....................... ..................................................................................................................................................... P. atombomba Kelsey