Corynoneura humbertoi, Wiedenbrug & Lamas & Trivinho-Strixino, 2012

Wiedenbrug, Sofia, Lamas, Carlos E. & Trivinho-Strixino, Susana, 2012, 3574, Zootaxa 3574, pp. 1-61 : 34-37

Corynoneura humbertoi sp. n.

( Figs 18–20)

Type material. Holotype male with pupal and larval exuviae, BRAZIL, SP, Ribeirão Preto, Lago Monte Alegre, 22.v.2000, H. F. Mendes . Paratypes: allotype female with pupal and larval exuviae same data as holotype but 26.xi.1998; one male and one female all with pupal and larval exuviae same data as holotype ; one male with pupal and larval exuviae same data as allotype .

Additional material examined. One pharate male, one pharate female both with pupal and larval exuviae, MS, Corumbá, BEP, Rio Miranda, 05.iv.2012, on Eichhornia sp. , S. Wiedenbrug.

Diagnostic characters. See male diagnostic characters of C. espraiado . The females are characterized by having one Sca larger, about 52–95 µm, second Sca less sclerotized, Csa orally curved with long oral dorsal rami and copulatory bursa oral median invaginated. The pupa can not be differentiated from C. hermanni Wiedenbrug et Trivinho-Strixino and C. longiantenna sp. n., it has rounded anal lobe separated through a straight perpendicular margin, shagreen on tergites fine and homogeneous. The larva of C. humbertoi have the first antennal segment longer than postmentum length, second antennal segment shorter than the third, mentum with two median teeth, first lateral teeth slightly larger than the second.

Etymology. Named after the chironomid specialist, Dr. Humberto F. Mendes, who collected and reared the specimens here described.

Description

Male (n = 3)

Total length 1.06 mm. Wing length 0.57–0.70 mm.

Color. Thorax brownish. Abdominal tergites I–IV whitish, other tergites and genitalia brownish. Legs whitish. Head. AR = 0.49–0.64. Antenna with 9–10 flagellomeres, apical flagellomere 120–153 µm ( Fig. 18 A). Flagellomeres with more than one row of setae each. Eyes pubescent.

Thorax. Antepronotal lobes dorsally tapering.

Wing. Clavus/wing length 0.22–0.24. Anal lobe absent ( Fig. 18 B).

Legs. Hind tibial scale 30–35 µm long, with one s-seta.

Hypopygium ( Figs 18 C–D). Tergite IX with 4 setae. Laterosternite IX with 1 seta. Superior volsella low with longer setae, aedeagal lobe triangular with a wide base, inferior volsella present apically on gonocoxite margin. Transverse sternapodeme straight, phallapodeme caudal attached. Phallapodeme with posterior margin sclerotized slightly curved.

Metric and meristic features in Table 1.

Female (n = 1–2)

Total length 1.2 mm. Wing length 0.51–0.62 mm.

Color. Thorax light brown. Abdominal tergites I-III, whitish, IV-IX brownish. Legs whitish.

Head. AR = 0.51. Antenna with 5 flagellomeres, apical flagellomere 52–57 µm long ( Fig. 19 A). Flagellomeres with more than one row of setae each. Eyes pubescent.

Thorax. Antepronotal lobes dorsally tapering.

Wing. Clavus/wing length 0.42. Anal lobe absent ( Fig. 19 B).

Legs. Hind tibial scale 35–37 µm long, with one small s-setae.

Genitalia ( Figs 19 C–E). Tergite IX with 2 setae. Laterosternite IX with 1–2 setae. One large seminal capsules 52–95 µm long; second difficult to see, one spermathecal duct with a loop, both spermathecal ducts join together shortly before seminal eminence. Notum 27 µm long. Apodeme lobe with median border sclerotized. Coxosternapodeme, curved, with two rami, first ending at roof of copulatory bursa, second long oral dorsal. Copulatory bursa oral median invaginated. Labia membranous, bare, funnel shaped, apically building the accessory gonopore(?). Gonocoxapodeme straight, gonapophyses median smoothly pointed. Cercus 35 µm long.

Metric and meristic features in Table 2.

Pupa (n = 1–4)

Total length 1.36 mm.

Color (exuviae). Cephalothorax light brown, abdomen transparent except light brown muscle markings, lateral margin and anal lobe.

Cephalothorax. Frontal apotome rugose. Thorax suture slightly rugose at scutal tubercle region. All Dc-setae thin taeniate, except Dc 3 wider. Dc 1 displaced ventrally. Rows of pearls at wing sheaths apparently absent.

Abdomen ( Figs 20 A–C). Tergite and sternite I bare, tergites III-IX with fine and homogeneous shagreen. Sternites with very fine shagreen. Conjunctives SIII/IV-SVII/VIII with small spinules. Segment I with 1, II with 3 L-setae and III-VIII with 4 long taeniate L-setae. Anal lobe rounded ( Fig. 20 B). Anal lobe with fringe not complete, 3 taeniate macrosetae and inner setae taeniate.

Metric and meristic features in Table 3.

Larva (n = 1–5)

Head. Postmentum 180–200 µm long. Head capsule integument smooth. Mentum with two median teeth, first lateral teeth not adpressed to median, larger than second lateral tooth ( Fig. 20 E). Antenna 575–618 µm long, segments two and three darker as the first segment. First segment much longer than postmentum length ( Fig. 20 D). Abdomen. Ventral setae modified, slightly wider and apical slit ( Fig. 20 F). Subbasal seta on posterior parapod with longer serrated rami, split at the base ( Fig. 20 G).

Metric and meristic features in Table 4.

Remarks. According to H.F. Mendes, larvae of C. humbertoi sp. n. were collected from leaves at the bottom of a lake in São Paulo State, additional material was found on Eichhornia sp. (Pontederiacea) in a river in Mato Grosso do Sul State, Brazil.