Corethrella (Corethrella) redacta 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 : 44-45

Corethrella (Corethrella) redacta Borkent, 2008

Fig. 19 ; Appendix 1

Material examined

BRAZIL – Bahia State • 1 ♀, adult; Uruçuca , PESC , “Fundos da sede” [behind park lodge]; 14°29ʹ40ʺ S, 39°08ʹ23ʺ W; 970 m a.s.l.; 31 Oct. 2016; V.A. Silva et al. leg.; light pan; CE-MHS .

Description

Female adult (n = 1)

HEAD. Sensilla ( Fig. 19A ): Ocular row with 2 thick offset setae at ventral part, 10 setae extending a little beyond vertex. Subocular row not well-defined; vertex, interocular space with few slender setae. Postgenal row with 12 slender setae located mid-posteriorly. With 1 ventromedial thick seta.

THORAX. Sensilla ( Fig. 19B ): Antepronotum with 1 intermediate anterodorsal seta. Postpronotum with 1 thick subdorsal seta and 2 slender setae more ventrally. Scutum, prescutal area with two thick setae. Antealar area with group of 7 thick and 3 slender setae posteroventrally located. Supraalar area with 2 thick and 1 slender setae anteroposteriorly aligned. Dorsocentral row, posterior part with group of 8 thick offset setae, longitudinally arranged; about 17 thick/intermediate and 5 slender completing row. Scutellum with 10 thick setae. Posterior anepisternum and anepimeron without setae.

WING. R 3 /R 1: 0.74; R 2+3 /R 2: 0.35.

LEGS. Empodium ( Fig. 19C ) of intermediate length and thickness, with 2 long branches bifurcated at base, apically bent. Ta1/Ta2: 2.33; Ta3/Ta4: 1.38.

Distribution and biology

This is the first record of Corethrella redacta both from the state of Bahia and from the Brazilian Northeast region. The single specimen was collected with a light trap near a small stream in an area of Atlantic forest in Serra do Conduru State Park, at an altitude of 970 m a.s.l.. This species has previously only been recorded from the type locality in the Brazilian state of Pará (Amazonian region), at an altitude of 30 m a.s.l. ( Borkent 2008).

Remarks

The shape of the empodium of this species is unique among all other examined species and differs considerably from those of other peruviana -group species. In the phylogeny proposed by Borkent (2008), Corethrella redacta appears as sister to C. truncata Borkent, 2008 , sharing two synapomorphies. It would be interesting to examine the empodium of C. truncata to verify whether they also share this peculiar morphology.

The number of setae on the posterior portion of the dorsocentral row is here differently interpreted than in Borkent (2008). See Morphology remarks for more details.

Figures

Fig. 19. Corethrella redacta Borkent, 2008, 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.