Corethrella (Corethrella) vittata Lane, 1939

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 : 70-71

Corethrella (Corethrella) vittata Lane, 1939

Fig. 33 ; Appendix 1

Material examined

BRAZIL – Santa Catarina State • 1 ♂, 4 ♀♀, adults; Porto Belo, Ponta do Araçá, Brejo do Guinho ; 27°07ʹ31ʺ S, 48°31ʹ21ʺ W; 92 m a.s.l.; 26 Apr. 2011; L.C. Pinho and Assis leg.; Shannon trap; CE-MHS • 1 ♂, adult; Brusque, RPPN Chácara Edith , stream/wier; 27°05ʹ55ʺ S, 48°53ʹ33ʺ W; 685 m a.s.l.; 4–5 May 2018; L.C. Pinho leg.; CDC trap; CE-MHS .

Description

Male and female adults (2 ♂♂, 4 ♀♀)

HEAD ( Fig. 33A ). Female antenna uniformly light brown, with flagellomeres ( Fig. 33B ) I–III elongate. 13 th flagellomere apically bifurcated. Sensilla coeloconica distribution: 1(IX–X), 2(XI–XIII), 4(I). Sensilla: Ocular row with 2 thick offset setae at ventral portion, more dorsally 11–14 setae extending posteriorly. Subocular row loosely defined, with about 7 slender setae. Vertex and interocular space with a few slender setae. Postgenal row with 6–11 intermediate setae, ranging from misposterior portion to ventromedially. With 2 thick ventromedial setae.

THORAX ( Fig. 33C ). Sensilla: Antepronotum with 1 intermediate posteroventral and 2–7 slender scattered setae. Postpronotum with 1 thick and 2–4 slender dorsal setae. Scutum, prescutal area with group of 3 thick, dorsoventrally aligned setae, near prescutal suture, 7–13 intermediate/slender setae more anteriorly. Antealar area with 10–12 thick/intermediate and 5–14 slender setae centrally located. Supraalar area with 1 thick, 3 intermediate, and 4–10 slender setae on ventral part. Dorsocentral row, posterior part with 4 thick and 2–5 slender offset setae; 16–25 thick/intermediate and 30–35 slender setae completing row. Scutellum with 10–11 thick setae. Posterior anepisternum bare. Anepimeron with 3–5 slender setae.

WING. Male R 3 /R 1: 0.48–0.49; R 2+3 /R 2: 0.64–0.73. Female R 3 /R 1: 0.54 (0.53–0.56); R 2+3 /R 2: 0.57 (0.53– 0.60).

LEGS. Empodium ( Fig. 33D ) of intermediate length and intermediate thickness, with 5 branches. Male Ta1/Ta2: 2.32–2.47; Ta3/Ta4: 0.50–0.58. Female Ta1/Ta2: 2.50 (2.42–2.59); Ta3/Ta4: 1.05 (1.00–1.09).

Distribution and biology

Specimens were collected with CDC and Shannon traps, in Santa Catarina State, in areas of Atlantic forest. Altitudes range from 45 to 685 m a.s.l. The specimens from Porto Belo have previously been recorded by Amaral & Pinho (2015).

Corethrella vittata is also known from Puerto Rico, Guyana and the Brazilian Atlantic forest of ES, SC, and SP states, at altitudes ranging from 5 to 85 m a.s.l. ( Borkent 2008).

Remarks

In his redescription of the species, Borkent (2008) reported that the female antenna was missing from the examined material; thus, we here describe and illustrate it. Corethrella vittata seems to be the only species in the quadrivittata group with two sensilla coeloconica on each of flagellomeres XI–XIII in both males and females.

Figures

Fig. 33. Corethrella vittata Lane, 1939, adult. A. Cranial setae, anterior and posterior views, and female clypeus in anterior view. B. Pedicel and flagellomeres, lateral view. C. Thoracic setae, lateral view. D. Hind leg claw and empodium, lateral view.