Corethrella (Corethrella) rotunda Borkent, 2008

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 : 29

Corethrella (Corethrella) rotunda Borkent, 2008

Fig. 11 ; Appendix 1

Material examined

BRAZIL – Santa Catarina State • 1 ♀, adult; Santo Amaro da Imperatriz, Plaza Caldas ; 27°44ʹ30ʺ S, 48°48ʹ25ʺ W; 424 m a.s.l.; 9–10 Aug. 2017; L.C. Pinho et al. leg.; CDC trap; CE-MHS .

Description

Female adult (n = 1)

HEAD ( Fig. 11A ). Sensilla: Ocular row with 1 thick offset seta at ventral part, more dorsally 10 setae shortly extending posteriorly. Subocular row well-defined, with about 9 slender setae. Vertex and interocular space without additional setae. Postgenal row with 5 intermediate setae, ranging from posterior end of ocular row to ventromedially. With 2 thick ventromedial setae.

THORAX ( Fig. 11B ). Sensilla:Antepronotum with 1 anterodorsal and 4 slender lateral setae.Postpronotum with 1 thick dorsal, 1 slender anterior, and 3 slender more posterior setae. Scutum, prescutal area with 3 thick setae dorsoventrally aligned near prescutal suture; about 7 intermediate, slender setae grouped more anteriorly. Antealar area with 9 thick/intermediate and 7 slender setae spread on ventral and medium portions. Supraalar area with 3 thick setae, with 6 slender surrounding. Dorsocentral row, posterior part with cluster of 3 thick setae; 17 thick/intermediate and approximately 13 slender completing the row. Scutellum with 10 thick setae. Posterior anepisternum with 1 slender seta. Anepimeron with 8 intermediate setae.

WING. R 3 /R 1: 0.64; R 2+3 /R 2: 0.47.

LEGS. Empodium ( Fig. 11C ) short, slender, with 3 branches. Ta1/Ta2: 2.63; Ta3/Ta4: 1.18.

Distribution and biology

The single specimen has previously been recorded in Amaral et al. (2019). It was collected via CDC trap in an area of Atlantic forest in Santa Catarina State, at an altitude of 424 m a.s.l. This species is otherwise known from Costa Rica, at altitudes ranging from 0 to 600 m a.s.l. ( Borkent 2008).

Remarks

This female presents an unusually large number of anepimeral setae for the rotunda group, and those setae seem thicker than the ones present on other species. See Morphology remarks section for more details.

Figures

Fig. 11. Corethrella rotunda Borkent, 2008, female adult. A. Cranial setae, anterior and posterior views, and clypeus in anterior view. B. Thoracic setae, lateral view. C. Hind leg empodium, lateral view.