Corethrella (Corethrella) peruviana 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 : 37-40

publication ID 10.5852/ejt.2023.874.2135

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Corethrella (Corethrella) peruviana Lane, 1939


Corethrella (Corethrella) peruviana Lane, 1939 View in CoL View at ENA

Figs 1 View Fig , 16 View Fig ; Appendix 1



Only extant species with the following combination of characters: darkly pigmented tergal plates ( Fig. 16D View Fig ); a small, darkly colored mandibular lobe ( Fig. 16D View Fig ); head dark brown with a pale postmentum ( Fig. 16D View Fig ); ventral margin of antennal groove with about ten large denticles ( Fig. 16E View Fig ).


Only extant species with the following combination of characters: a flattened, wide, trilobed respiratory organ ( Fig. 16G View Fig ); abdominal segments strongly expanded laterally ( Fig. 16H View Fig ); segment III with two well-developed, darkly pigmented lateral setae ( Fig. 16H View Fig ).

Material examined

BRAZIL – Bahia State • 1 ♀, adult; Porto Seguro, RPPN Veracel, mussununga ; 16°21ʹ33ʺ S, 39°08ʹ15ʺ W; 72 m a.s.l.; 30 Aug. 2019; A.P. Amaral leg.; feeding on frog ( B. faber ); CE-MHS GoogleMaps 1 ♀, adult; same collection data as for preceding, except frog-call trap; CE-MHS GoogleMaps 1 ♀, adult, with larval and pupal exuviae; same collection data as for preceding, except hand net, ground pools; CE-MHS GoogleMaps 1 ♀, adult; same collection data as for first, except 12 Mar. 2020; frog-call trap (chorus); CE-MHS GoogleMaps 1 ♀, adult; Porto Seguro, RPPN Veracel , “Rio trilha escolar” [river by educational trail]; 16°23ʹ09ʺ S, 39°10ʹ14ʺ W; 89 m a.s.l.; 13 Mar. 2020; A.P.Amaral leg.; frog call; CE-MHS GoogleMaps 1 ♀, adult; same collection data as for preceding, except light sheet; CE-MHS GoogleMaps 1 ♂, adult; same locality as for preceding; 12 Feb. 2019; M.M.L. Sousa leg.; light pan; CE-MHS GoogleMaps 1 ♀, adult; Igrapiúna, Estação Michelin ; 13°48ʹ14ʺ S, 39°10ʹ16ʺ W; 59 m a.s.l.; 23 Mar. 2019; A.P. Amaral leg.; CDC trap; CE-MHS GoogleMaps . – Santa Catarina State • 1 ♂, adult; Porto Belo, Ponta do Araçá , “Brejo de altitude” [altitude marsh]; 27°07ʹ38ʺ S, 48°31ʹ20ʺ W; 115 m a.s.l.; 25 Jul. 2011; Ganzer and Fabris leg.; light trap; CE-MHS GoogleMaps .


Male and female adults (2 ♂♂, 7 ♀♀)

HEAD. Sensilla ( Fig. 16A View Fig ): Ocular row with 2 thick offset setae at ventral part, 9–12 setae more dorsally, shortly extending posteriorly. With well-defined subocular row of 9–14 slender setae. Postgenal row with 12–18 small setae, restricted to mid-posterior region. With 1 ventromedial thick seta.

THORAX. Sensilla ( Fig. 16B View Fig ): Antepronotum with 0–3 slender anteromedial setae. Postpronotum with 1 thick dorsal and 1–4 intermediate setae. Scutum, prescutal area with 4 anteroventral and 3 posterodorsal thick setae; 2–7 slender setae scattered in between. Antealar area with cluster of about 8–12 thick and 4–13 slender/intermediate setae on posteroventral portion. Supraalar area with 2–3 thick and 4–11 slender setae on ventral portion. Dorsocentral row, posterior part with 6–9 thick offset, longitudinally aligned setae; about 18–29 thick/intermediate and 10–22 slender setae filling row. Scutellum with 8–10 thick setae. Posterior anepisternum with 0–2 dorsal setae. Anepimeron bare.

WING. Male R 3 /R 1: 0.59–0.61; R 2+3 /R 2: 0.46–0.58. Female R 3 /R 1: 0.67 (0.62–0.73); R 2+3 /R 2: 0.44 (0.36– 0.61).

LEGS. Empodium ( Fig. 16C View Fig ) elongate, of intermediate thickness, with 5 (bifid, trifid or multifid) branches. Male Ta1/Ta2: 2.33–2.61; Ta3/Ta4: 1.33–1.38. Female Ta1/Ta2: 2.46 (2.35–2.60); Ta3/Ta4: 1.31 (1.27–1.40).

Larva (n = 1)

EXUVIA ( Fig. 16D View Fig ). Head, siphon, and segment X dark brown; postmentum pale; darkly pigmented tergal plates on I–VII.

HEAD ( Fig. 16E View Fig ). Roughly triangular shape in dorsoventral view, 1.16 times as wide as long. Antenna 0.53 times length of head; antennal groove 1.58 times length of antenna; ventral margin of antennal groove with about 10 large denticles. Postmentum with base moderately wide, strongly tapering, 1.39 times as wide as long; length 0.41 of head. Prementum slightly curved, with 14 blunt teeth, darkly pigmented, central one largest, remaining gently decreasing in size. Anteroventral projection of gena somewhat projected anteriorly, flattened, surface smooth. Postcoila short, not extending to lateral margin of gena. Subgenal carina with a few minute spinules. Crown with 12 regularly distributed spines; first dorsal and first ventral shorter than remaining; largest spine 0.10 mm long. Seta 16-C situated mesially from crown. Mandible with darkly pigmented teeth; apical tooth 1.55 times as long as first dorsal tooth; seta 3-Mn 0.28 length of 4-Mn; lacinia mobilis with 7 blades; mandibular lobe small, darkly pigmented, apart from teeth. Sensilla: 10-C, 12-C, 13-C, and 16-C unknown; 9-C short, simple; 11-C short, fan-like; 14-C short, simple; 15-C short, fan-like. 0a-Mn short, fan-like; 0b-Mn elongate, simple. 6-Mx short, fan-like; 4-Mx unknown, 5-Mx short, fan-like.

SIPHON. 0.30 mm long. Seta 1 fan-like, at about 0.23 of length from base. 6-S and 9-S lightly colored; length of 6-S/9-S: 0.86.

Pupa (n = 1)

EXUVIA ( Fig. 16F View Fig ). Uniformly light brown; setae moderately dark pigmented.

CEPHALOTHORAX. Length 1.01 mm. Respiratory organ ( Fig. 16G View Fig ) flattened, wide, somewhat bilobed, 0.53 mm long longitudinally. Dorsal seta 1 moderately elongate, thick, one length apart from dorsal 2; dorsal 2 slightly longer, less thick; both setae arising from undifferentiated cuticle. Supraalar 2 and metathoracic setae absent.

ABDOMEN ( Fig. 16H View Fig ). Moderately elongate, tapering, integument dorsolaterally rough; length of segments I–VIII 0.98 mm, width/length: 0.75. Margins serrate, strongly projected posterolaterally. Dorsal setae short, about 0.25 length of respective segments, equal from III–VII. Lateral setae L-4 elongate, longer than respective segments. Largest seta L-4-VI, 1.6 length of segment. Terminal process elongate, basal width 0.42 of length, with broad paddles; D-1-IX short, at about 0.7 length from base; apical spine not articulated; lacking ventroapical seta V-1-IX; female genital lobe round, occupying almost all basal portion. Chaetotaxy as illustrated.

Distribution and biology

This is a new record both for Bahia state and the Brazilian Northeast region. Individuals were collected as immatures in ground pools of a white-sandy tropical savanna patch inside a fragment of lowland Atlantic forest (mussununga ecosystem), and as adults in frog-call pan traps, light traps and one specimen captured biting a Boana faber ( Fig. 1 View Fig ). Altitudes range from 72 to 89 m a.s.l. The specimens from Santa Catarina have previously been reported by Amaral et al. (2019).

Corethrella peruviana is otherwise recorded from Costa Rica, Panama, Colombia, Venezuela, Trinidad and Tobago, Guyana, Equador, Peru and the Brazilian states of PA, SC, and SP, at altitudes ranging from 0 to 269 m a.s.l. ( Borkent 2008; Amaral et al. 2019).


The adult specimens here examined match the description by Borkent (2008) (see the discussion about the dorsocentral row in the Morphology remarks section). The description by Lane & Aitken (1956) of the immatures of Lutzomiops juquiana Lane, 1939 later considered a junior synonym of C. peruviana Lane, 1939 ( Borkent 2008) , also correspond to the specimens in hand, differing only in the number of teeth in the larval prementum (11).













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