Corethrella (Corethrella) yanomami Amaral, Mariano & Pinho, 2019

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 : 87-88

Corethrella (Corethrella) yanomami Amaral, Mariano & Pinho, 2019

Fig. 43 ; Appendix 1

Material examined

Holotype

BRAZIL – Amazonas State • ♀, adult; Barcelos, Parque Estadual Serra do Aracá , Igarapé da anta (banho), S02; 00°54ʹ30ʺ N, 63°26ʹ24ʺ W; 1105 m a.s.l.; 25 Jul. 2009; N. Hamada et al. leg.; Pennsylvania trap; INPA.

Description

Female adult (n = 1)

HEAD ( Fig. 43A ). Sensilla: Ocular row with 1 thick offset seta on ventral part, 1 more dorsal, and 12 setae shortly extending posteriorly. Subocular row not well-defined anteriorly, with 8 slender posterior setae; vertex with a few additional slender setae. Postgenal row with 10 slender setae, ranging from posterior end of ocular row to subventrally. With 2 thick ventromedial setae.

THORAX ( Fig. 43B ). Sensilla: Antepronotum with 1 slender anterodorsal seta and 4 intermediate setae ventrolaterally. Postpronotum with 1 thick, 1 intermediate, and 1 slender dorsal setae. Scutum, prescutal area with 2 thick setae near prescutal suture and 3 slender ones more posteriorly; anterior portion with 4 slender ventral setae. Antealar area with 10 thick/intermediate and 7 slender setae scattered on ventral part. Supraalar area with 1 thick seta, surrounded by 9 slender setae. Dorsocentral row, posterior part with cluster of 5 thick setae; about 18 thick/intermediate and approximately 31 slender setae completing row. Scutellum with 8 thick setae. Posterior anepisternum bare. Anepimeron with 5 slender setae.

WING. R 3 /R 1: 0.59; R 2+3 /R 2: 0.59.

LEGS. Empodium ( Amaral et al. 2019: 115, as fig. 7f) of intermediate length and thickness, with 3 branches. Ta1/Ta2: 2.86; Ta3/Ta4: 1.25.

Distribution and biology

The specimen examined is the holotype, described in Amaral et al. (2019): “This species is known from a single female specimen collected with a light trap in Barcelos municipality, Amazonas state. Aracá State Park is in a mountainous region of Amazon forest, the Tepuis, near the Brazilian border with Venezuela.” The altitude recorded was 1105 m a.s.l.

Remarks

Four specimens collected with light trap in Uruçuca, Bahia keyed out to Corethrella yanomami but differed with regard to the number of clypeal setae (3–4), posterior dorsocentral setae (3–4), flagellomere VIII without a sensillum coeloconicum, and empodium with two branches. These differences may represent intraspecific variation, but conservatively, they were not included in the present study. Since C. yanomami was described based on a single specimen, it is important to try to collect more individuals at the type locality in order to better assess the morphological variation of the species.

Figures

Fig. 43. Corethrella yanomami Amaral, Mariano & Pinho, 2019, female adult. A. Cranial setae, anterior and posterior views, and clypeus in anterior view. B. Thoracic setae, lateral view.