Chaethippus notatus, 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 : 136-139

Chaethippus notatus sp. nov.

( figs. 25–29 )

urn:lsid:zoobank.org:act:C27BA98A-3104-400E-B765-A7568CC6E731

Material examined. Holotype ♂ BRAZIL, Rio de Janeiro, Itatiaia, PNI, trilha Ruy Braga , parte baixa, Malaise trap, 29.viii–24.ix.2014, Barbosa L.S. leg. [ MNRJ].

Diagnosis. Tibial spur well developed; one strong vibrissa; scutum with brownish stripes; one pair of prescutellar setae; pleuron completely yellow; fore coxa with yellow pilosity; ocellar triangle spot faint.

Description. Body length, 2.45 mm. Wing length, 2.4 mm.

Head ( figs 25–26 ). 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 about as long as wide, lateral margins subparallel, front margin straight. Ocellar triangle pruinose, extending to slightly beyond half of frons length, posterior margin two thirds width of frons, lateral margins straight, apex acute; macula brownish. Eye oval, long axis slightly oblique. Face as long as high; facial carina width as wide as aristal base, almost reaching the frontoclypeal suture; antenna yellow, postpedicel reniform, as high as long, darkened apically; arista yellowish on the basal 1/3 and black apically, with short pubescence, about three times as long as postpedicel; gena a bit shorter than 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. 25–26 ). Scutum quadrate, yellow, with four brownish stripes, densely pruinose with dark setulae, a black mark on the anterior scutal concavity restricted to the area of insertion of the head; one posterior dorsocentral seta developed, longer than outer vertical seta; a row of two prescutellar setae; postpronotal lobe yellow with one long seta equal to notopleurals and prescutellars; postalar seta developed, about as long as dorsocentral seta. Pleuron bare, yellow. Scutellum yellow pruinose, flat on the disc, with black setulae, wider than long, rounded 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 dark brown, shining. Wing. Hyaline with pale brown veins covered in sparse brown microtrichia; costal sections 1–4: 8: 9: 7.5: 4; veins R 4+5 and M 1 almost parallel; distance between r-m and dm-m about five times length of r-m. Halter yellow. Legs ( figs. 25, 27 ). Entirely yellow; femoral organ concolor, with four rows of spines; hind tibia with a long, curved preapical spur; posterior tibial organ short and oval, occupying less than half of tibia length, yellow. Abdomen ( fig. 25 ). As in the generic diagnosis. Male terminalia ( figs. 28–29 ). Remnant of the 6th sternite bilobed apically. Epandrium wider than long, surstylus long, with almost parallel margins, slightly arched; cercus longer than wide, with a blunt lobe and one very long seta. Hypandrium weakly sclerotized, closed; basiphallus cylindrical; distiphallus short, and membranous, striate; pre- and postgonite fused, finger-like, with sensory pores and a pair of small setae; phallapodemic sclerite rounded; phallapodeme short, not bifid apically; sperm pump present. Female terminalia. Unknown.

Etymology. The specific epithet “ notatus ” is a Latin adjective, meaning marked, referring to the brown stripes on the notum.

Remarks. All species of Chaethippus have several microtrichiae on the inner margin of the femoral organ ( fig. 12 ). However, C. notatus has the inner margin with scarce pilosity ( fig. 27 ). Another characteristic restricted to C. notatus is the remnant of the 6th sternite being short and bilobed apically.

Figures

FIGURES 25–29. Chaethippus notatus sp.nov. holotype. 25, habitus (scale bar 1 mm). 26, head and thorax in dorsal view. 27, femoral organ. 28, male terminalia terminal (scale bar 0.1 mm). 29, male terminalia ventral. Abbreviations: bas, basiphallus; cer, cercus; dis, distiphallus; ep, epandrium; gon, gonites; hyp, hypandrium; phal, phallapodeme; phal s, phallapodemic sclerite.

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.