Chaethippus carioca, Riccardi, 2020

Riccardi, Paula Raile, 2020, Taxonomic revision of the genus Chaethippus Duda, 1930 (Diptera: Chloropidae) with the description of four species, Zootaxa 4802 (1), pp. 129-140 : 132-134

Chaethippus carioca sp.nov.

( figs. 7–14 )

urn:lsid:zoobank.org:act:F64B14A4-E4F0-4032-85BE-CA4D2CA1ABCF

Material examined. Holotype ♂ BRAZIL, Rio de Janeiro, Itatiaia, PNI, Lago Azul mata (PNI-M3B), S22°27’01.1” W44°36’55.3”, 830 m, 2.x–2.xi.2015, Malaise trap, Biota Faperj, Azevedo & eq. leg. [ MZUSP] . Paratypes: 3 ♀ 3 ♂ same data as holotype [ MZUSP, MNRJ] ; 1 ♀ same data except Córrego Maromba, 3–30.v.2015, Malaise trap, D.M. Takiya & eq. leg. [ MZUSP] .

Diagnosis. Tibial spur absent; one vibrissa; four to five prescutellar setae; notopleuron with a brown mark anteriorly, anepisternum finely pilose; fore coxa with a row of 4 stout spines anteriorly.

Description. Body length, 2–2.3 mm. Wing length, 1.9–2.2 mm.

Head ( figs 7–10 ). Wider than long dorsally and higher than long in profile, entirely yellow except for black ocellar tubercle and a black spot on the ocellar triangle. Head and thoracic setae black. Frons slightly wider than long, lateral margins subparallel, front margin straight. Ocellar triangle pruinose, extending to three quarters length of frons, posterior margin almost the same width as frons, lateral margins straight and darkened, apex acute; macula blackish. Eye oval, long axis slightly oblique. Face about as long as wide; facial carina acute, almost reaching the frontoclypeal suture; antenna yellow, postpedicel reniform, as high as long; arista yellowish on the basal 1/3 and black apically, with short pubescence, about three times as long as postpedicel; gena as wide as length of postpedicel, rather curved inwards; one vibrissa; occiput yellow, ventrally with a M-shaped black mark; proboscis yellow; palpus yellow, small, equal in length to antenna, with brown setulae; oral margin not protruding; clypeus yellow. Thorax ( figs. 7, 9 ). Scutum quadrate, yellow, with six orangish stripes, densely pruinose with dark setulae; one posterior dorsocentral seta developed, longer than outer vertical seta; a row of four to five prescutellar setae; postpronotal lobe yellow with one long seta equal to notopleurals and prescutellars; postalar seta developed, about as long as dorsocentral seta. Pleuron yellow, a brown spot on the anterior edge of notopleuron; anepisternum pilose. Scutellum yellow pruinose, convex on the disc, with black setulae, wider than long, slightly triangular apically; apical scutellar seta with separation equal to that of posterior ocelli and as long as length of scutellum; two pairs of lateral setae developed, as long as dorsocentrals; post-scutellum orange-yellow, shining. Wing. Hyaline with pale brown veins covered in sparse brown microtrichia; costal sections 1–4: 9: 12: 6.5: 3.5; veins R 4+5 and M 1 almost parallel; distance between r-m and dm-m four times length of r-m. Halter pale yellow. Legs ( figs. 11–12 ). Yellow, apical tarsomeres slightly darkened; femoral organ with four rows of small spines; hind tibia with preapical spur absent; posterior tibial organ short and oval, occupying less than half of tibia length, yellow. Abdomen ( fig. 7 ). As in the generic diagnosis. Male terminalia ( figs. 13–14 ). Remnant of the 6th sternite quadrate. Epandrium slightly wider than long, surstylus long, with parallel margins; cercus longer than wide, with a blunt lobe, with a very long seta. Hypandrium weakly sclerotized, closed; basiphallus cylindrical; distiphallus short, and membranous, striate; pre- and postgonite fused, trapezium-shaped, with sensory pores and a pair of small setae; phallapodemic sclerite absent; phallapodeme short, bifid apically; sperm pump present. Female terminalia ( fig. 7 ). Segments 6–8 narrow; epiproct bare, with a pair of setae; hypoproct pilose; cerci light brown, long and narrow, with short setae at base.

Etymology. The specific epithet “ carioca ” is derived from a Portuguese noun meaning “an inhabitant of Rio de Janeiro city”. The noun carioca is also used for residents of the state of Rio de Janeiro and the specific epithet is referring to the Brazilian state where the specimens were collected.

Remarks. Unfortunately, more than 100 specimens of C. carioca with the same data as the holotype were lost in the MNRJ fire ( Duarte 2019). The three paratypes used for obtaining the MEV micrographs have the same data as the holotype, however, they have another preparation set—the specimens were coated with gold and some body parts were removed.

Figures

FIGURES 7–14. Chaethippus carioca sp.nov. paratypes. 7, habitus (scale bar 1 mm). 8, head in dorsal view. 9, head and thorax in profile (arrow indicates the fore coxa strong setae). 10, detail of the head in dorsal view. 11, tibial organ. 12, femoral organ. 13–14, male terminalia in terminal view (scale bar 0.1 mm). Abbreviations: bas, basiphallus; cer, cercus; dis, distiphallus; ep, epandrium; fr, frons; oc tr, ocellar triangle.