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

Wiedenbrug, Sofia, Lamas, Carlos E. & Trivinho-Strixino, Susana, 2012, 3574, Zootaxa 3574, pp. 1-61 : 16-21

Corynoneura diogo sp. n.

( Figs 7–9)

Type material. Holotype male with pupal and larval exuviae, BRAZIL, SP, Luiz Antônio , Estação Ecológica do Jataí, Lagoa do Diogo, 28.vii.2003, S. Trivinho-Strixino . Paratypes: allotype female with pupal and larval exuviae, same data as holotype except 17.ii.2011 , S. Wiedenbrug; 3 males same data as holotype but v.2007 .

Diagnostic characters. The male of Corynoneura diogo sp. n. can be differentiated from others species with straight transversal sternapodeme and phallapodeme attached in the caudal apex of the sternapodeme by having the antennal apex with a distinct group of about 20 sensilla chaetica, slightly sinuous lateral sternapodeme and aedeagal lobe long and triangular. The group of sensilla at the antennal apex is also distinctive on the female, which also have a triangular apex, copulatory bursa in dorsal view with membranous oral extension and laterosternite IX without setae. The pupa has anal lobes laterally rounded, joined medially as an inverted V, complete fringe of taeniate setae and shagreen on tergites IV-V of minute points, tergites and sternites points as long as wide. The larva has the head capsule integument sculpturate, mentum with two median teeth and the first pair of lateral teeth almost as strong as the median teeth.

Etymology. Named after the Lake Diogo, where the specimens were collected. The specific epithet is treated as a noun in apposition.

Description

Male (n = 2)

Total length 1.15 mm. Wing length 0.72 mm.

Color. Thorax brownish. Abdominal tergites I–IV whitish, other tergites and genitalia brownish. Legs whitish. Head. AR = 0.65–0.68. Antenna with 9 flagellomeres, apical flagellomere 170 µm. Flagellomeres, except first and last, with more than one row of setae each. Antennal apex with 20 sensilla ( Fig. 7 A). Eyes pubescent.

Thorax. Antepronotal lobes dorsally tapering ( Fig. 7 B).

Wing. Clavus/wing length 0.20. Anal lobe absent ( Fig. 7 C).

Legs. Hind tibial scale 37–42 µm long, with one small s-seta.

Hypopygium ( Figs 7 D–F). Tergite IX with 4 setae. Laterosternite IX without setae. Superior volsella absent. Inferior volsella slightly rounded. Aedeagal lobe long and triangular. Transverse sternapodeme straight, lateral sternapodeme sinuous, phallapodeme caudal attached. Phallapodeme elongated, with posterior margin sclerotized. Gonostylus thicker before apex.

Metric and meristic features in Table 1.

Female (n = 1)

Wing length. 0.51.

Color. Thorax brownish. Abdominal tergites III-IX with dark brown bands. Legs whitish.

Head. AR = 0.45. Antenna with 5 flagellomeres, apical flagellomere 45 µm long ( Fig. 8 A). Flagellomeres with more than one row of setae each. Antennal apex with 15 sensilla, triangular. Eyes pubescent.

Thorax. Antepronotal lobes dorsally tapering.

Wing. Clavus/wing length 0.40. Anal lobe absent.

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

Genitalia ( Figs 8 B–C). Tergite IX with 2 setae. Laterosternite IX without setae. Two seminal capsules 32 µm long; one spermathecal duct with a loop, second straighter, both ducts join together shortly before seminal eminence, which has sclerotized outer borders. Notum 20 µm long. Membrane well sclerotized. Apodeme lobe median borders sclerotized. Coxosternapodeme curved, with one end at roof of copulatory bursa, copulatory bursa with dorsal-oral extension, oral median invaginated. Labia membranous, bare, apparently divided in two lobes. Gonocoxapodeme straight, gonapophyses median smoothly pointed. Cercus 25 µm long.

Metric and meristic features in Table 2.

Pupa (n = 1–2)

Total length 1.34 mm.

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

Cephalothorax. Frontal apotome slightly granulated. Thorax suture orally with some spinules. Dc 3 -seta wider than other three thin-taeniate setae. Dc 1 displaced ventrally. Wing sheaths with one to two rows of pearls.

Abdomen ( Figs 9 A–D). Tergite and sternite I bare, tergites and sternites II-IX with homogeneous shagreen, shagreen points very small, not elongate. Conjunctives SIV/V-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. 9 B). Anal lobe with fringe almost complete, 3 taeniate macrosetae and inner setae taeniate.

Metric and meristic features in Table 3.

Larva (n = 1–2)

Head. Postmentum 175–187 µm long. Head capsule integument of exuviae, ventral with fine scratches ( Fig. 9 E). Mentum with two median teeth and five lateral teeth ( Fig. 9 F). Antenna 355 µm long, segments two and three darker (not drawn). First antennal segment subequal to postmentum length.

Abdomen. No modified ventral setae observed. Subbasal seta on posterior parapod serrated at one margin ( Fig. 9 G).

Metric and meristic features in Table 4.

Remarks. The males of C. diogo sp. n., C. salviniatilis sp. n. and C. boraceia sp. n. are similar. All three species have the sensilla chaetica concentrated at the antennal apex, distinct straight transverse sternapodeme and more or less sinuous lateral sternapodeme. They are differentiated from each other by the shape of the aedeagal lobus and lateral sternapodeme.

Larvae of C. diogo were found on Eichhornia sp. (Pontederiacea) from marginal lakes of the Mogi-Guaçú river at São Paulo State, Brazil.