Coroichlorops antennatus, Riccardi, Paula Raile & Amorim, Dalton De Souza, 2016

Riccardi, Paula Raile & Amorim, Dalton De Souza, 2016, Revision of the Neotropical genus Coroichlorops Paganelli 2002 (Diptera: Chloropidae), Zootaxa 4093 (3), pp. 435-443 : 439-441

Coroichlorops antennatus sp. nov.

( Figs. 10–16 )

Diagnosis. First flagellomere reniform, with an elongate sensorial pit; arista flat; scutum with five orange, clearly distinguishable stripes; gonites not fused, with 2 pairs of setae; bacilliform sclerite wide.

Material examined. Holotype ♂, Brazil, State of Pará, Jacarecanga; xii.1968; M. Alvarenga leg. [MZUSP] (abdomen and right wing prepared). Paratype: 1 ♀, same data as holotype [MZUSP].

Description. Body length, 4.8–5.4 mm. Wing length, 3.0 mm. Background color, pale yellow.

Head ( Figs. 10–13 ). Wider than thorax, broader than long dorsally, longer than high in profile; frons slightly projected forward; shiny yellow ocellar triangle, almost reaching frons apex, brownish at posterior half, narrow, no groove; occiput slightly darkened, pilose; gena less than half first flagellomere height, inner margin straight; postgena short; parafacialia not visible in profile; eyes bare, large, rounded; facial carina thin, shallow, incomplete; clypeus dark brown; labella reduced, yellow; palpus cylindrical, yellow; pedicel dorsal margin wider than ventral margin; first flagellomere reniform, dark yellow, with an elongate sensorial pit; arista dark, flat, sword-like, with dark short spaced hairs. Chaetotaxy: 6 short orbitals, almost indistinct; 7 interfrontals outside ocellar triangle; inner and outer verticals well developed; ocellars and postocellars not observed (broken); vibrissa thin; gena with few pale hairs. Thorax ( Fig. 10 ). Scutum length/width ratio 1.6, five orange stripes, a mesal dark orange longitudinal line present, and a small lateral orange spot more or less distinguishable, subshiny, flattened dorsally, dark pilosity inserted on rounded punctures; postpronotum with a blackish spot, and 1 postpronotal developed seta; scutellum rounded apically, not flattened, with regular apical setae; pleura shiny, with no dark spots; 1+2 notopleurals; 1 pair of dorsocentrals; postalar and intrapostalar not observed (probably broken); halter yellow with light yellow apex.

Legs. Yellow; fore femur with 1 to 2 long hairs laterally; tibial organ short, narrow, concolorous with leg; tarsomeres of mid and hind leg darkened apically. Wing ( Fig. 14 ). Membrane hyaline; costal sectors 1-2-3-4: 30- 41 -20-5; R4+5 straight; R4+5 and M1+2 parallel; distance between r-m and dm-cu 6 times r-m length; transversal veins placed on basal half of wing. Abdomen. Five tergites fully sclerotized, dark yellow. Male terminalia ( Figs. 15- 16 ). Epandrium large, rounded; proctiger sclerotized, well delimited; mesolobus (fused cerci) long, narrow, rectangular; bacilliform sclerite wide, placed under mesolobus; surstylus forceps-shaped, no microtrichiae, prolonged arm attached to epandrium laterally to mesolobus, directed basally, a beak at tip; hypandrium with two basal, rounded projections, arms long, apex with internal projection moderate, external projection short; pre- and postgonites in line, not fused, postgonite with 2 pairs of setae and sensorial pores; basiphallus oval; distiphallus short; phallapodeme short, bifid at posterior half; epiphallus, longer than basiphallus, thin, weakly sclerotized. Female terminalia. Cercus short, yellow.

Etymology. The specific epithet of the species name comes from the Latin word antenna, as a reference to the wide arista.

Comments. The lateral margins of the ocellar triangle are relatively straight, diverging from the drop-shape condition seen in the other species of Coroichlorops. The most aberrant characteristic of C. antennatus , however, is the flat wide arista. A long sensorial pit on the first flagellomere is a feature shared between C. antennatus and C. yungas . The arista of the holotype of C. antennatus is broken and only with the most basal aristomere present, so the description of the arista was based on the paratype.

Figures

FIGURES 10 – 14. Coroichlorops antennatus, sp. nov.. 10. Habitus (holotype). 11. Head, dorsal view (holotype). 12 – 13. Antenna (paratype). 14. Wing (holotype). Scale bar, 1 mm.

FIGURES 15 – 16. Coroichlorops antennatus sp. nov. male genitalia, holotype. 15. Ventral view. 16. Hypandrium and phalic complex, lateral view. Scale bar, 0.1 mm. The arrow in figure 15 point towards bacilliform sclerite and, in figure 16, towards epiphallus.