Corethrella munteantaroku, Amaral & Mariano & Pinho, 2019

Amaral, André P., Mariano, Rodolfo & Pinho, Luiz Carlos, 2019, Four new species and some new records of Brazilian frog-biting midges (Diptera Corethrellidae), Zootaxa 4706 (1), pp. 103-120: 107-110

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Corethrella munteantaroku

sp. n.

Corethrella munteantaroku   sp. n.

( Figures 1 View FIGURE 1 and 2 View FIGURE 2 )

Type material. Holotype, male adult, slide mounted: “HOLÓTIPO Corethrella munteantaroku Amaral, Mariano & Pinho   ♂, Manaus, AM, BR, Res. Adolpho Ducke”, “Barro Branco, Malaise 100m acima da ponte”, “ S02°55’47” W59°58’22”, 73m a.s.l. ” “ 04-08.XI.2010, Pinho & Mendes”( INPA). GoogleMaps  

Etymology. The specific epithet refers to the words “mosquito” (muntean) and “frog” (taroku) in the Tukana language, spoken in Brazilian and Colombian Amazon. The name is to be regarded as a noun in apposition.

Diagnostic characters. This species differs from other extant Corethrella   by the following combination of characters: Adult male: two expanded and apically bent setae at dorsobasal region of gonocoxite, halter lighter than scutellum and wing with slightly darker scales forming a faint midlength band.

Description. Adult male (n=1). ( Tables 1, 2, figs. 1–2)

Head ( Fig. 1A View FIGURE 1 ). Laterally expanded in dorsal view. Coronal suture elongate, reaching area between ventral margin of eye bridge. Four long setae on frons, near ventral margin of eye bridge, forming angle in relation to coronal suture. Palpus ( Fig. 2A View FIGURE 2 ) brown, with 3rd palpal segment slightly expanded apically. Clypeus ( Fig. 2B View FIGURE 2 ) square, with 11 setae on dorsal surface, 6 of them bolder, arranged approximately laterally to one another in central area.Antenna ( Fig. 2C View FIGURE 2 ) uniformly brown, with 13th flagellomere bifurcated at apex. Sensilla coeloconica distributed according to table 1.

Thorax ( Fig. 1B View FIGURE 1 ). Medium brown, with ventral portion of katepisternum, sclerites around base of wing pale. Prescutal suture elongate, reaching dorsocentral row of setae. Posterior portion of dorsocentral row of setae with 1 discrete offset seta. Anterior anepisternum with diagonal suture, dividing ventral, dorsal portions equally. Posterior anepisternum divided by transversal suture, with ventral portion triangular in shape, more darkly pigmented.

Wings ( Fig. 1C View FIGURE 1 ). Almost uniformly brown, with band of darker scales on veins M, R 1, Rs, R 4+5, apex of Sc, C. Apex of R 2 slightly basal to apex of M 1. Halter lighter than scutellum.

Legs ( Fig. 1B View FIGURE 1 ). Almost uniformly light brown, with apex of midfemur and all tarsi only slightly darker than tibiae. Femora, tibiae with slender scales. Fifth tarsomere of fore-, midlegs apically bilobed. Subapical tarsal claws, equal on hind leg, unequal on mid- and foreleg, midleg claw longer than those on foreleg. Empodia ( Fig. 2D View FIGURE 2 ) thinner than setae at apex of 5th tarsomeres, with length similar to average diameter of 5th tarsomeres, with two bifid branches.

Abdomen ( Fig. 1D View FIGURE 1 ). Light brown with gonocoxite darker than segments 8, 9.

Genitalia ( Fig. 1D View FIGURE 1 , 2E, F View FIGURE 2 ). Gonocoxite tapering apically ( Fig. 2E View FIGURE 2 ); anteromedial region with group of elongate spicules; dorsobasal row with three strong setae, two more basal ones expanded apically bent, expanded; one thinner dorsal seta located more posteriorly; one thick subbasal setae on dorsomedial surface, two very thick subapical ones (anterior one thicker than the other) with bases joined by sclerotized plate. Gonostylus thick, with thickness nearly constant, only subbasal region slightly expanded, midlength slightly contracted; subbasal seta located posteroventrally at 0.2 of gonostylus, length about 0.25 of gonostylus; apical seta short, with two smaller setae (visible only with 1000x magnification) situated lateral, apicolaterally. Aedeagus ( Fig. 2F View FIGURE 2 ) elongated, strongly tapered distally, with margins fused at apex.

Female and immatures. Unknown.

Distribution and biology. This species is known only from the single individual collected with a Malaise trap at the type locality, the Barro Branco stream, at Adolpho Ducke Forest Reserve, Manaus, AM. Barro Branco is a slow flowing, shallow stream, approximately 2m meters wide. It is surrounded by a fragment of Amazon rainforest just outside the limits of Manaus urban area.

Taxonomic Discussion. This species shares many of the synapomorphies which define the peruviana species group (as designated by Borkent, 2008), such as the presence of apically expanded and bent setae on the gonocoxite and the sclerotized plate at the sub-basal region. Inside the peruviana Lane   group, other shared apomorphies reveal closer relationships with this species. The presence of scales on femora and elongate spicules on anteromedial area of gonocoxite place Corethrella munteantaroku   sp. n. in the clade which includes C. peruviana Lane   , C. ramentum Borkent   , C. inornata Borkent   , C. pallida Lane   , and C. blanda Dyar. Borkent   recognizes a synapomorphy which groups together C. pallida   and C. blanda   , that is the presence of a faint midlength band on the wing. Corethrella munteantaroku   sp. n. also presents a wing band, however it is a discrete one, similar to other lineages along the genus. At the present time it is not possible to state whether the wing band in C. munteantaroku   sp. n. is homologous to the ones in C. blanda   and C. pallida   .


Australian Museum


Embrapa Agrobiology Diazothrophic Microbial Culture Collection


Instituto Nacional de Pesquisas da Amazonia