Winthemmyia angustata (Kröber)

Webb, Donald W., 2005, New Genera of Neotropical Therevidae (Insecta: Diptera), Zootaxa 1091 (1), pp. 1-26 : 21-25

publication ID	https://doi.org/ 10.11646/zootaxa.1091.1.1
publication LSID	lsid:zoobank.org:pub:5DE78585-99EB-49B8-BA44-524F112E83DD
persistent identifier	https://treatment.plazi.org/id/F23E8B66-FFD1-FFB0-FEBC-07F9FC65BE36
treatment provided by	Felipe
scientific name	Winthemmyia angustata (Kröber)
status

Treatment

Winthemmyia angustata (Kröber) View in CoL

( Figs. 42–50 View FIGURES 42–50 )

angustata Kröber (1913:29 View in CoL orig. desc.) ( Psilocephala View in CoL ); Irwin and Webb (1992:87 checklist, comb. change) ( Brachylinga View in CoL ). Type locality Brazil, Bahia. Holotype female in ZMHB. New combination.

Diagnosis. Winthemmyia angustata can be separated from other South American genera by the spermathecal sac duct being over 3 times the length of the spermathecal sac; the autapomorphic characteristic of the distiphallus ( Fig. 47 View FIGURES 42–50 ) being broad, its lateral margins parallel forming a broad canopy; the apical margin of the distiphallus being deeply emarginate on both sides of the median extension of distiphallus with these apicolateral projections curving medially to a narrow apex and bearing several short, dark setae.

Description of male.

Morphometric variation (n=2).

Body length 7.7–8.6 mm.

Head. Length 0.92 mm. Ocellar tubercle dark reddish brown, pruinescence gray; setae dark reddish brown, elongate; male tubercle slightly raised above vertex. Face slightly extended beyond eyes (0.08 mm). Eyes holoptic; ommatidia of homogenous size. Frons pruinescence white; setae absent; black pruinose band absent lateral to antennal base. Antenna dark brown, scape and pedicel pruinescence gray, dense; antenna/head length 0.73; scape cylindrical, length 0.12–15 mm, width 0.10–0.11 mm, length/width 1.2–1.4, scape/pedicel length 1.5–1.9, scape/pedicel width 1.0, setae dark reddish brown, absent on median surface, macrosetae dark reddish brown; pedicel globular, length 0.08 mm, width 0.10–11 mm, length/width 0.7–0.8; first flagellomere narrow, oval, tapering apically, second flagellomere cylindrical, short, third flagellomere cylindrical, tapered apically, over 2 times length of second flagellomere, apical style short, flagellum length 0.42 mm, length/width 3.5, flagellum/scape length 2.8. Parafacial pruinescence white; setae absent. Maxillary palpus dark reddish brown, pruinescence silver; cylindrical, apex slightly clavate; length 0.42–0.46 mm, width 0.08 mm, length/width 5.3–5.8; setae dark brown basally, white apically. Genal setae white, elongate. Occipital setae white, elongate, absent on dorsal fourth; macrosetae dark reddish brown, scattered. Postocular macrosetae dark reddish brown in single row.

Thorax. Macrosetae dark reddish brown, 3 np, 2 sa, 1 pa, 0 dc, 2 sc. Mesonotum pruinescence gray; vittae indistinct; setae dark brown, elongate intermixed with pale whitish yellow, subappressed setae. Postpronotal lobe gray; setae white. Cervical sclerite dark reddish brown, pruinescence white; setae white over entire sclerite. Prosternum with white setae. Pleuron dark reddish brown, pruinescence white; setae white on propleuron, anepisternum, katepisternum, laterotergite, and scutellum; absent on proepimeron, anepisternum, meron, metanepisternum and metakatepisternum. Wing. Length 6.5–7.0 mm, length/width 2.8–3.5; membrane opaque, veins brown; setulae absent on R 1; pterostigma brown, narrow; cell c up closed; cell m 3 open widely. Halter dark brown. Legs. Coxal setae white. Femora dark reddish brown, ventral setae white on fore and midfemora, becoming appressed, lanceolate dorsally; av 1:0:2–3, pv 0:0–1:2–4. Tibiae dark yellowish brown, apex becoming dark brown. Tarsi dark brown.

Abdomen. Cuticle dark reddish brown, pruinescence gray, denser posteriorly and laterally; dorsal and lateral setae white, elongate. Terminalia (MEI 147344). Cuticle dark reddish brown, hypoproct dark yellow. Tergite 8 ( Fig. 42 View FIGURES 42–50 ), bilobed, anterior margin broadly emarginate; posterior margin deeply emarginate; median length short (0.02 mm); setae dark yellow, abundant laterally, absent medially on posterior margin. Sternite 8 ( Fig. 43 View FIGURES 42–50 ) quadrate, sides rounded, posterior margin deeply emarginate; setae dark yellow, separated medially on posterior margin. Epandrium ( Fig. 42 View FIGURES 42–50 ), quadrate, anterior margin truncate; posterior margin deeply emarginate; median length shorter than width; posterolateral margin short, rounded with narrow, dark yellow, glabrous margin; setae dark yellow with several dark reddish brown setae posterolaterally. Cercus ( Fig. 42 View FIGURES 42–50 ) fused basally; ending beyond posterolateral margin of epandrium; ending above posterior margin of hypoproct; setae dark yellow to dark reddish brown. Hypoproct ( Fig. 42 View FIGURES 42–50 ) quadrate, ending beyond posterolateral margin of epandrium; posterior margin truncate, ending below apex of cercus. Hypandrium sclerotized, directed posteriorly. Gonocoxite ( Figs. 43–45 View FIGURES 42–50 ) quadrate, side rounded, medial margin straight then tapered apically to attenuate inner gonocoxal process, setae dark reddish brown, macrosetae dark reddish brown on enlarged posteromedial tubercle; inner gonocoxal process slightly paler than gonocoxite; dorsal view ( Fig. 44 View FIGURES 42–50 ), gonocoxal apodeme short, ending at anterior margin of gonocoxite, gonocoxal bridge absent; lateral view ( Fig. 45 View FIGURES 42–50 ) quadrate with short ventral outer gonocoxal process; ventral lobe ( Fig. 42 View FIGURES 42–50 ) moderately large, surrounding lateral margin of gonostylus, apical fourth directed ventrally as pointed projection, ventral spines absent. Gonostylus ( Fig. 46 View FIGURES 42–50 ) broad, tapered apically to attenuate projection, dorsal surface with large glabrous flange, setae dark yellow, scattered. Aedeagus with dorsal apodeme ( Fig. 47 View FIGURES 42–50 ) swollen laterally, attenuate anteriorly, anterior margin truncate; ventral apodeme ( Fig. 48 View FIGURES 42–50 ) narrow, flattened laterally, extending to anterior margin of dorsal apodeme, lateral view ( Fig. 49 View FIGURES 42–50 ) bladelike, expanded ventrally; distiphallus ( Fig. 47 View FIGURES 42–50 ) broad, lateral margins parallel, forming broad canopy, apical margin deeply emarginate on both sides of median extension of distiphallus, apicolateral projections curved medially to narrow apex bearing several, short, dark setae, lateral view ( Fig. 49 View FIGURES 42–50 ) with apex of the distiphallus curved ventrally bearing several apicolateral spines; ejaculatory apodeme ( Fig. 47 View FIGURES 42–50 ) swollen posteriorly, anterior threefourths narrow, cylindrical, not reaching anterior margin of dorsal apodeme, in crosssection circular.

Female.

Similar to male except for following.

Morphometric variation (n=2).

Body length 7.5–7.8 mm.

Head. Length 0.90–0.92 mm. Eyes separated by distance greater than width of ocellar tubercle. Frons pruinescence silver gray ventrally, dark brown dorsally; setae dark brown on dorsal half. Antenna/head length 0.79–0.82; scape length 0.18–0.22 mm, width 0.10– 0.12 mm, length/width 1.5–2.2, scape/pedicel length 2.0–2.4, scape/flagellum width 0.83– 0.86; pedicel length 0.09 mm, length/width 0.8–0.9; flagellum length 0.40–0.48 mm, width 0.12–0.14 mm, length/width 3.3–3.4, flagellum/scape length 1.8–2.7. Maxillary palpus length 0.44 mm, length/width 5.5. Occipital setae white, elongate becoming appressed dorsally.

Thorax. Mesonotum pruinescence gray with three dark brown vittae, lateral vitta divided into spots; setae dark brown, elongate intermixed with pale, whitish yellow, appressed setae. Wing. Length 6.5–7.0 mm, length/width 3.3–3.5. Legs. Anteroventral macrosetae 1:0:3–4, pv 0:1:4–5.

Abdomen. Cuticle dark reddish brown, pruinescence gray on tergites 1 and 5–7, across posterior margins of tergites 2, posterolaterally on tergites 3–4; dorsal setae dark reddish brown, appressed with white elongate setae across posterior margin of tergites 1– 3; lateral setae dark reddish brown. Terminalia (MEI 109327). Anterior margin of sternite 8 truncate. Median lobe of tergite 9 lacking setae. Aedeagal guide diverging anteriorly. Furca ( Fig. 50 View FIGURES 42–50 ) oval, dorsal and anterior margins closed; length 0.54 mm, width 0.26 mm; lacking anteromedial, posteromedial, and anterolateral projections. Common spermathecal duct shorter than furca, trifurcating anteriorly into 2 threadlike spermathecal ducts and a spermathecal sac. Spermathecal sac duct narrow, over 3 times longer than spermathecal sac. Two spherical spermathecae.

Immature stages. Unknown.

Habitats and Temporal Phenology. Adults of Winthemmyia angustata have been collected November.

Distribution. Winthemmyia angustata is known from Bahia, Brazil.

Specimens examined. Type specimen. The holotype female of Psilocephala angustata Kröber ( MEI 147345 ) is labeled " Brasilien , Bahia " and is in the ZMHB . Other specimens: BRAZIL. Brasilia, Winthem , 1 male MEI 04734 , 1 female 109327 ( NHW); Restinga de Marambaia , 2.XI.1936, S. Lopes, 1 male MEI 147880 ( INPA) .