Cerodontha (Butomomyza) orcina Spencer, 1973

Cerodontha (Butomomyza) orcina Spencer, 1973 View in CoL

Figs 3 View Figure 3 , 4 View Figure 4

Cerodontha (Dizygomyza) orcina Spencer, 1973: 77 View in CoL .

Cerodontha (Butomomyza) orcina Boucher 2005: 2 View in CoL .

Material examined. 1♂ MNRJ: MNRJ-ENT1-69659 , Brasil, RJ, Teresópolis , PARNASO, casa do pesquisador, Malaise, 22°27’19.4”S 042°59’51.7”W, 1148m, 13.ix–25.x.2021, Eq. lab Dipneo col. GoogleMaps

Description. Wing length. 1.9–2.1 mm (♂). Length of ultimate section of vein M 4 divided by penultimate section: 0.9. Eye height divided by gena height: 7.6. Ocellar triangle short, ending to the posterior ors. Fronto-orbital plate and parafacial not prominent. Lunule only slightly higher than wide. First flagellomere small and rounded, with short, whitish hairs. Arista short pubescent. Gena slightly angled posteriorly ( Fig. 3A–C View Figure 3 ).

Chaetotaxy. Two incurved ori, the anterior more inclined, three reclinate ors (holotype with two), all equally developed. Ocellar and postocellar setae subequal to fronto-orbitals. One row of long and reclinate orbital setulae. Eye with short pilosity. Two pairs of prominent setae apically on each palpus. One presutural and three postsutural dorsocentral setae, strong and decreasing in length anteriorly. Seven rows of acrostichal setulae (four rows in holotype). Prescutellar acrostichal setae present. Lateral scutellar setae only slightly shorter than apical setae. Mid tibia with one strong lateromedial seta.

Coloration. Body mostly brown. Ocellar triangle and fronto-orbital plate slightly shining. Frons brown, slightly yellowish, with pruinosity. Lunule and face brown with grey pruinosity. Antenna entirely yellowish brown. Clypeus dark brown, slightly shining. Gena and palpus brown, slightly paler. Labellum yellow. Scutum and scutellum shining. Pleurae brown, with a yellow stripe on superior and posterior margins of anepisternum. Posterior margin of postpronotum slightly yellowish. Wing hyaline with base yellow. Calypter greyish-yellow, margin and hairs brown. Halter white. Legs brown, with fore knee and all tarsi yellowish.

Genitalia. Epandrium with a large rounded process above anus. Cerci very short, setulose. Surstylus small, incurved, with 6–7 spines and some long setae ( Fig. 4A, B View Figure 4 ). Subepandrial sclerite hook-shaped apically. Hypandrium subtriangular with apex broadly rounded. Basiphallus short, bifid. Hypophallus long, sclerotized laterally and membranous microsetulose centrally, and a clear tubule emerging from between sclerites. Paraphallus short, membranous with basal margin rounded. Mesophallus a little shorter than distiphallus, with stalk narrow and apical bulb which occupies a little less than half the total length of the mesophallus. Distiphallus 1.5x longer than mesophallus, entirely divided into one pair of sinuate arms, directed apically, with a thickening apically, which becomes membranous at the end ( Fig. 4C, D View Figure 4 ). Ejaculatory apodeme large, with stalk narrow; sperm pump clear, with an apical sclerotization ( Fig. 4E View Figure 4 ).

Host. Unknown.

Distribution. Brazil (new record), Venezuela.

Remarks. This species is very similar to Cerodontha (B.) puertoricensis Spencer (in Spencer and Stegmaier 1973). However, there are some small differences between both, such as halter white, basiphallus slightly shorter and apical bulb of the mesophallus slightly straight at base in Cerodontha (B.) orcina . Besides this, C. (B.) orcina has strong spines on the surstylus, whereas for C. (B.) puertoricensis, Spencer (1973) mentioned only a fringe of four or five weak setae along the inner margin. In the original description of C. (B.) orcina , was mentioned two ors and four rows of acrostichal setulae, but we observed three ors and seven rows in the analyzed specimen, which we consider to be a variation within this species.