Corethrella (Corethrella) flavitibia 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 : 53-54

Corethrella (Corethrella) flavitibia Lane, 1939

Fig. 23 ; Appendix 1

Material examined

BRAZIL – Bahia State • 1 ♀, adult; Porto Seguro, RPPN Estação Veracel ; 16°18ʹ23ʺ S, 39°06ʹ34ʺ W; 22 m a.s.l.; 28 Aug. 2019; A.P. Amaral leg.; light pan; CE-MHS .

Description

Female adult (n = 1)

HEAD. Sensilla ( Fig. 23A ): Ocular row with 1 thick offset seta at ventral part and 12 setae shortly extending posteriorly. Subocular row well-defined, with 11 slender setae; vertex and interocular space without setae. Postgenal row with 15 slender setae ranging from mid-posteriorly to ventromedially. With 2 thick ventromedial setae.

THORAX. Sensilla ( Fig. 23B ): Antepronotum with 3 intermediate and 4 slender posteroventral setae. Postpronotum with 1 thick dorsal and 1 more ventral intermediate setae. Scutum, prescutal area with 2 thick and 1 intermediate setae, vertically arranged near prescutal suture; group of 6 thick/intermediate and 4 slender setae anteriorly. Antealar area with 12 thick/intermediate and 6 slender setae clustered on posteroventral portion. Supraalar area with 3 thick setae, with 5 slender setae surrounding. Dorsocentral row, posterior part with group of 5 thick offset setae; about 15 thick/intermediate and 17 slender setae completing the row. Scutellum with 10 thick setae. Posterior anepisternum without setae. Anepimeron with 14 slender setae.

WING. R 3 /R 1: 0.49; R 2+3 /R 2: 0.93.

LEGS. Empodium ( Fig. 23C ) short, slender, with 3 branches. Ta1/Ta2: 2.31; Ta3/Ta4: 1.30.

Distribution and biology

Corethrella flavitibia is newly recorded both from the state of Bahia and from the Brazilian Northeast region. The single female was collected with a light trap near a brook in the Atlantic forest reserve RPPN Estação Veracel, at an altitude of 4 m a.s.l. It was previously known only from the type locality in São Paulo, Brazil, at an altitude of 85 m a.s.l. ( Borkent 2008).

Remarks

The specimen collected diverged from the description by Borkent (2008) with respect to the number of setae on the posterior portion of the dorsocentral row and by the presence of sensilla coeloconica on flagellomeres II and IX. This variation is accepted for other species and is hence considered intraspecific variation here.

Figures

Fig. 23. Corethrella flavitibia Lane, 1939, female adult. A. Cranial setae, anterior and posterior views, and clypeus in anterior view. B. Thoracic setae, lateral view. C. Hind leg claw and empodium, lateral view.