Cerodontha (Butomomyza) obscurata Martinez, 1992

de Sousa, Viviane R., Gomes, Marina M. & Couri, Márcia S., 2024, On Cerodontha (Diptera: Agromyzidae) from Brazil: new species and new records, Zoologia (e 23038) 41, pp. 1-17 : 4

Cerodontha (Butomomyza) obscurata Martinez, 1992

Figs 1 , 2

Cerodontha (Butomomyza) obscurata Martinez in Spencer et al. 1992: 274; Etienne and Martinez 2013: 476.

Material examined. 1♂ INPA: Brasil, AM, Manaus, R. F. Adolpho Ducke, Sede, 30.i.2018, Varredura, R. Ale-Rocha et al. 1♂ MNRJ: MNRJ-ENT1-69658 : Brasil, AM, Manaus, R. F. Adolpho Ducke, Sede, 30.i.2018, Varredura, R. Ale-Rocha et al .

Description. Wing length: 1.35–1.7 mm (♂). Length of ultimate section of vein M 4 divided by penultimate section: 0.6. Eye height divided by gena height: 10–11.5. Ocellar triangle short, ending to the posterior ors. Fronto-orbital plate and parafacial not prominent. Lunule only slightly wider than high. First flagellomere small and rounded, with short, yellowish hairs. Arista long and pubescent. Gena slightly angled posteriorly ( Fig. 1A–C ).

Chaetotaxy. Two incurved ori, two reclinate ors, all equally developed. Ocellar and postocellar setae subequal to fronto-orbitals. One row of long and reclinate orbital setulae. Eye with short pilosity. One pair of prominent setae apically on each palpus. One presutural and three postsutural dorsocentral setae, decreasing in length anteriorly. Four to five rows of acrostichal setulae. Prescutellar acrostichal setae present. Lateral scutellar setae short, less than half length of apical setae. Mid tibia with one strong lateromedial seta.

Coloration. Body mostly dark brown. Ocellar triangle slightly shining. Fronto-orbital plate, lunule and face brown with grey pruinosity. Frons brown. Antennae entirely dark brown. Clypeus dark brown, slightly shining. Gena yellowish brown. Palpus dark brown. Labellum yellow. Scutum and scutellum slightly shining. Pleurae brown, with a yellow stripe on superior and posterior margins of anepisternum. Notopleuron slightly lighter brown. Wing hyaline with base yellow. Calypter greyish-yellow, margin and hairs brown. Halter yellow. Legs brown, with fore knee yellowish. Abdomen shining.

Genitalia. Epandrium with well-developed and pointed supra-anal process. Cerci short, setulose, with one long apical seta. Surstylus small, incurved, with 2–3 strong spines and some long setae on inner margin ( Fig. 2A, B ). Subepandrial sclerite slightly curved apically. Hypandrium short, V-shaped ( Fig. 2C ). Basiphallus short, U-shaped with a median projection curved at apex. Hypophallus with long and narrow lateral sclerites, membranous centrally, with a long and curved clear extension. Paraphallus short, with basal margin straight. Mesophallus narrow at base with a bulb apically. Distiphallus as long as mesophallus, entirely divided into one pair of sinuate arms, slightly directed dorsally, with apex slightly flared at opening ( Fig. 2D, E ). Ejaculatory apodeme with a large blade; sperm pump oval, with a sclerotized bar laterally ( Fig. 2F ).

Host. Unknown.

Distribution. Brazil (new record), Guadeloupe, Martinique.

Remarks. The analyzed specimens from Brazil have longer wings (1.7 mm) and a slightly shorter mesophallus than the holotype from Guadeloupe (1.35 mm). We consider this small difference to be intraspecific variation.

Figures

Figure 1. Cerodontha (Butomomyza) obscurata, habitus, male: (A) lateral view; (B) dorsal view; (C) head, frontal view. Scale bars: 1 mm.

Figure 2. Cerodontha (Butomomyza) obscurata, male genitalia: (A) cercal plate, dorsal view; (B) cercal plate, lateral view; (C) hypandrium; (D) phallus, lateral view; (E) phallus, ventral view; (F) ejaculatory apodeme. Scale bars: 0.01 mm.