Corethrella (Corethrella) yucuman Caldart & Pinho, 2016

Amaral, André P., Mariano, Rodolfo & Pinho, Luiz Carlos, 2023, Description of five new species of frog-biting midges (Diptera, Corethrellidae) from Brazil and examination of new morphological characters with utility for taxonomic and phylogenetic studies, European Journal of Taxonomy 874 (1), pp. 1-120 : 30-31

Corethrella (Corethrella) yucuman Caldart & Pinho, 2016

Fig. 12 ; Appendix 1

Material examined

Paratypes

BRAZIL – Rio Grande do Sul State • 2 ♂♂, adults; Derrubadas, Parque Estadual do Turvo ; Riacho Salto ; 27°08ʹ22ʺ S, 53°52ʹ52ʺ W; 185 m a.sl.; 14 Feb. 2014; V.M. Caldart et al. leg.; silent frog-call trap ( CS1 N, control); CE-MHS • 2 ♀♀, adults; same collection data as for preceding, except (PG1N control); CE-MHS .

Description

Male and female adults (2 ♂♂, 2 ♀♀)

HEAD ( Fig. 12A ). Sensilla: Ocular row with 1 thick offset seta at ventral portion, about 15 setae more dorsally, shortly extending posteriorly. Subocular row well-defined, with about 15 slender setae; no other setae on vertex. Postgenal row with 4 intermediate setae ranging from posterior end of ocular row to mid-posterior portion of head. With 3 thick ventromedial setae.

THORAX ( Fig. 12B ). Sensilla: Antepronotum with 3–5 slender setae spread on lateral portion. Postpronotum with 1 thick and 3–4 slender dorsal setae. Scutum, prescutal area with group of about 8–9 thick and 5–10 slender setae on dorsal portion, difficult to distinguish from anterior part of dorsocentral row. Antealar area with 1 thick anterodorsal, 3–4 thick ventral, and 9–24 slender setae from ventral to dorsal regions.Supraalar area with 3 thick central setae and 2–8 slender setae more dorsally.Dorsocentral row, posterior part with 3 thick and 1 slender offset setae, somewhat lateral to one another; about 16 thick and 25 slender setae filling the row. Scutellum with 6–7 thick setae. Posterior anepisternum with 1 slender dorsal seta. Anepimeron with 2–3 slender setae. Katepisternum with 1 slender posterodorsal seta.

WING. Non-marginal veins with setae instead of scales. Male R 3 /R 1: 0.42–0.43; R 2+3 /R 2: 1.21–1.35. Female R 3 /R 1: 0.52–0.56; R 2+3 /R 2: 0.73–0.76.

LEGS. Empodium ( Fig. 12C ) of intermediate length and thickness, with 7 branches. Male Ta1/Ta2: 3.10– 3.20; Ta3/Ta4: 1.40. Female Ta1/Ta2: 2.92–3.00; Ta3/Ta4: 1.14–1.29.

GENITALIA. Gonostylus with one thick, subbasal seta posteroventrally located.

Distribution and biology

The examined specimens are paratypes described in Caldart et al. (2016). This species has been found in Turvo State Park, Rio Grande do Sul, in an area of seasonal deciduous forest of southern Brazil near the Argentinian border. Specimens were captured with frog-call traps, playing the call of Physalaemus aff. gracilis (Boulenger, 1883) , Crossodactylus schmidti Gallardo, 1961 , Scinax perereca Pombal, Haddad & Kasahara, 1995 and a silent control trap (see details in Caldart et al. 2016). Altitudes range from 185 to 382 m a.s.l.

Remarks

Caldart & Pinho ( Caldart et al. 2016) described the wings as having very narrow scales. We now reinterpret this character, considering setae instead of scales to be present on wing veins. This species was also originally described as lacking a subbasal seta on the gonostylus, but the seta is actually present. Corethrella yucuman , together with C. brevivena Borkent, 2008 ( Borkent 2008: 228) are the only known species with a katepisternal seta, which, along with the short flagellomere VIII, the apex of R 2 being more basal than the apex of M 1 and a short coronal suture, indicates a close relationship with the clade C. brevivena + C. globosa Borkent, 2008 .

Figures

Fig. 12. Corethrella yucuman Caldart & Pinho, 2016, adult. A. Cranial setae, anterior and posterior views, and female clypeus in anterior view. B. Thoracic setae, lateral view. C. Hind leg empodium, lateral view.