Pachylopella antennata, Winterton & Irwin, 2023

Winterton, Shaun L. & Irwin, Michael E., 2023, Revision of the South American stiletto fly genera Entesia Oldroyd and Melanothereva Malloch, with the description of a new genus (Therevidae: Agapophytinae), Zootaxa 5269 (1), pp. 1-82 : 69-72

Pachylopella antennata sp. n.

( Figs 45–48 ; 54 )

Zoobank: urn:lsid:zoobank.org:act:59450CC6-2D0E-4461-A1CA-12475AA2AA63

Diagnosis. As per genus diagnosis.

Description. Body length.6.5–8.0 mm(male), 8.0–9.0mm(female). Head.Relatively broad; frons flat to rounded, glossy black, pubescent silver around antennae, brown pubescent around ocellar tubercle, male with small patch of elongate, black setae above antenna, female with scattered, short setae, male frons width at narrowest point slightly wider than anterior ocellus; male occiput concave, female convex; male postocular setae elongate, strongly curved anteriorly, additional setae irregularly arranged on occiput; occiput pubescence greyish silver, brown dorsally; genal setae brown; antenna pubescent brown, scape elongate, cylindrical and bulbous, longer than flagellum, numerous erect, large, black macrosetae; flagellum brown pubescent admixed with black setae. Thorax. Scutum glossy black with sparse brown pubescence, numerous erect black setae (longer and denser anteriorly in male), macrosetae black, chaetotaxy: np, 3–4; sa, 1; pa, 1; dc 4–5; sc 1–2; scutellum black, overlain with brown pubescence; pleuron glossy black with sparse grey pubescence, black setae on anepisternum, katepisternum and katatergite; coxae glossy black, overlain with silver pubescence, setae black, macrosetae numerous, strong, black; fore femur brown with yellow apex, mid- and hind femora dark yellow with apices brown, short dark setae admixed with longer pale setae; tibiae and tarsi brown; wing uniform faint brown infuscate, darker anteriorly, venation dark, costal margin setae scattered, not in rows; haltere stem dark with knob yellow-white. Abdomen. Dark brown, yellow posteriorly on tergites, thicker laterally; male abdomen vestiture extensive long pale setae, female setae uniformly short and black; terminalia brown. Male terminalia. Epandrium elongate, pointed posterolaterally; cerci ovoid, brown; macrosetae dark and robust on epandrium and gonocoxites; gonocoxites and appendages brown; outer gonocoxite process triangular; phallus with dorsal apodeme of parameral sheath forked; distiphallus straight and tapered; ejaculatory apodeme narrow; gonocoxal apodemes relatively narrow. Female terminalia. As per genus description.

Comments. Pachylopella antennata sp. n. is a slender dark species with distinctive abdominal markings and yellow haltere knob, as well as elongate and numerous macrosetae on the head and thorax. It is known only from a few coastal localities in Frey Jorge National Park in the Coquimbo Region of central Chile.

Etymology. The specific epithet is adjective derived from the Latin, antenna —sailyard, pole; referring to the distinctive antennal shape.

Type material— Holotype male, CHILE: Coquimbo Region: Fray Jorge National Park , 15 km SW Pachingo [- 30.5664, -71.6442], 30.X.1966, M.E. Irwin, hand collected, 100–200 m (MEI028434; MEUC) . Paratypes: CHILE: Coquimbo Region: 2 males, same data as holotype (MEI028433, 028435; CSCA) ; 1 female, Fray Jorge National Park [-30.6576, -71.6655], 17.X.1997, Malaise in dry sandy creek bed, M.E. Irwin, E.I.&M.E. Schlinger, D.W.Webb, 225 m (MEI106770; MEUC) ; 1 female, Fray Jorge National Park [-30.6448, -71.6572], 16.X.1997, Malaise on bank of Quebrada las Vacas, M.E. Irwin, E.I. &M.E. Schlinger, D.W. Webb, 225 m, (MEI106771; CSCA) ; 1 female, Frey Jorge National Park, El Mineral [-30.6576, -71.6655], Malaise in wash upstream of seep, 7–24.XI.2003; M.E. Irwin, F.D. Parker, 224 m ( CSCA) .

Figures

FIGURE 45. Pachylopella antennata sp. n.: A. Male, oblique view; B. same, lateral view (Scale line: 1.0 mm).

FIGURE 46. Pachylopella antennata sp. n.: A. Female, oblique view; B. same, lateral view.

FIGURE 47. Pachylopella antennata sp. n.: A. Male head, oblique view.

FIGURE 48. Pachylopella antennata sp. n., male terminalia: A. epandrium; B. gonocoxites, ventral view; C. phallus, lateral view; D. phallus, dorsal; view. Scale line: 0.2 mm.

FIGURE 54. Distribution map of Melanothereva bicolorata and Pachylopella antennata.