Caladomyia kapilei, Trivinho-Strixino, Susana, 2012

Trivinho-Strixino, Susana, 2012, A systematic review of Neotropical Caladomyia Säwedal (Diptera: Chironomidae), Zootaxa 3495, pp. 1-41 : 33-36

Caladomyia kapilei sp. n.

( Figs 67–74 )

Material examined. Holotype: male with pupal exuviae, BRAZIL, S P, São Carlos, Córrego do Fazzari (21° 58’ S, 47° 53’ W), 9/vii/1999, leg. F. O. Roque (C2–28, LEIA /UFSCar). Paratypes: 1 male with pupal exuviae, as holotype, except 5/viii/2004 (C2–29); 2 males as holotype except 19/vii/1999 (C2–33, C2–32, LEIA /UFSCar); 1 pupa with pharate male and one larva in the same slide, as holotype C2–35, LEIA /UFSCar).

Etymology. Named in honor to Dr. Fabio de Oliveira Roque, “Kapilé” to his friends, who collected and reared in laboratory many chironomid larvae during his graduate studies.

Diagnostic characters. Caladomyia kapilei sp. n. differs from all other species of the genus by the combination of the following characters. Adult male: thorax, abdomen, antenna and legs yellowish; AR 0.77; fore leg ratio 2.69; hypopygium with anal tergite bands of Y-type, fused part 40 µm long; anal point 24 µm long with posterior ending divided in three protrusions; bars 18 µm long; digitus 28 µm long, reaching well beyond posteromedian margin of superior volsella. Pupa: frontal apotome wrinkled, without cephalic tubercle; thorax with weak granulation close to anterior median suture; tergite III–IV with longitudinal paired band of long spines obliquely divergent posteriorly; T V–VI with patches of short multiple spines. Larva: Antennal pedestal with short spur; clypeal S3 plumose.

Description

Male (n = 4)

Dimensions. Small, length about 2.3–2.5 mm.Wing length 1.26–1.35 mm.

Coloration. Head, thorax and abdomen yellow, legs white-brown.

Head. Eyes ratio 2.4. Frontal tubercles 12–16 µm long. Antennal flagellum 800–881µm long; AR 0.62–0.77. Palpomere 2–5 lengths: 31–44, 87–111, 87–100, 169–200 µm. Temporal setae 5, uniserial. Clypeus with 10–13 setae.

Thorax. Ac 10–12, biserial beginning near antepronotum; Dc 4–5; Pa 1; Scts 4. Halteres with 4 setae.

Wing. Width 0.31–0.48 mm. VR 1.20–1.30. Membrane macrotrichia restricted to distal portion of the wing.

Legs. Front tibia with one short white spur. Mid and hind tibiae with two black combs, each one with one spur. Lengths and proportions as in Table 12.

fe ti ta1 ta2 ta3 ta4 ta5 LR p1 687– 731 287–337 906–969 425–444 362–381 269–306 111–137 2.69–3.20 p2 650–694 500–531 325–350 119–144 94–106 56–69 44–50 0.63–0.66 p3 656–719 512–644 319–506 200–275 206–262 100–156 75–81 0.62–0.78 Hypopygium ( Fig.67 ). Anal tergite near 77–95 µm long, with 2 distal setae. Anal tergal bands Y-shaped; fused part about 40–48 µm long. Anal point 24–31 µm long, with slightly concave margins; lateral margin bearing 3 setae. AnPR 1.7–2.0. Anal point bars 18–22 µm long, their tips not trespassing apex of anal point; AnPBR 2.2–2.4. Superior volsella quadrangular near 26–29 µm large, with 5 dorsal setae and 1 ventral on anterior part of median margin. Posteromedian part drawn out into a prominent tip. Digitus 30–37 µm long, reaching well beyond median corner of superior volsella. Inferior volsella bent in an S-shape. Median volsella short, with 2 lamelliform and 4 simple setae. Gonostylus 84 µm long. Hypopygium ratio 0.7–1.1.

Pupal exuviae (n = 3)

Dimensions. Length of abdomen: male near 1.8 mm. Wing sheath 680–720 µm. Coloration yellowish.

Cephalothorax ( Fig. 68 ). Frontal setae elongate, slender, 128 µm long; cephalic tubercles absent. Thoracic horn slender and smooth. Thorax with weak granulation close to median suture. Wing sheath with very short nose. Thoracic setation on both sides: 3 precorneals (Pc1–3), 143, 119, 119 µm long, and 2 lateral antepronotals (LAps1–3). Dc 1–4 present and situated in two groups widely separated; distance between D C1– D C3 146–168 µm.

Abdomen. Tergite I bare; II with central transverse field of fine shagreen; T III with longitudinal paired bands of long spines diverging posteriorly; T IV with longitudinal paired bands of long spines slightly divergent posteriorly; T V–VI with paired patches of short multiple (bifid or trifid) spinules ( Fig. 69 ). T VII–VIII bare. Hook row continuous, occupying near 1/2 width of segment II. Segment VIII with posterolateral combs consisting of 1 large marginal tooth and 10–12 overlapping ventral teeth ( Fig. 70 ). Anal lobe with complete fringe of about 20–22 Taeniae and 2 dorsal taeniae on each side. Segments II–IV with 3 L setae; segment V–VI with 3 taeniae; segment VII with 4 taeniae; segment VIII with 5 taeniae.

4th instar larva (n = 1)

Dimensions. Small, total length 3.0 mm.

Head. Width 212 µm, length 281–294 µm; IC 0.72–0.74. Clypeal (S3) branched ( Fig. 72 ). Antenna 5- segmented, on pedestal, 54–61 µm long with short spur; basal segment 1.2–1.3 times as long as flagellum, with basal ring organ and small seta in distal 1/2; segment 2 as long as segments 3–5; Lauterborn organs large, pedicels, including LO, 84–87 µm long, proximal half sclerotized ( Fig. 71 ). Pecten epipharyngis of 3 distally serrated scales. Premandible with 3 teeth; brush well developed. Mandible with pale dorsal tooth; apical and two inner teeth brown ( Fig. 73 ). Mentum 58–64 µm long, with pale median tooth and 5 pairs of lateral teeth brown, decreasing in size laterally ( Fig. 74 ). Ventromental plates 66–69 µm long.

Abdomen with anal tubules, short. Posterior parapods with simple hooks.

Remarks. The main characteristics that differentiate the male of C. kapilei sp. n. from other species are the shape superior volsella with posteromedian tip and the curved format of the digitus. The patterns and distribution of spines on abdominal tergite of the pupa are similar to those of C. bruneola sp. n. and C. carolensis sp.n. The short spur of antennal pedestal and the shape of the clypeal seta (S3) distinguish the larvae of C. kapilei sp. n. from other species of the genus.

The larvae live on bottom sediments of forested streams in central area of state of São Paulo.

Figures

FIGURES 67 – 74. Caladomyia kapilei sp. n. Male. 67. Hypopygium, dorsal (left), ventral (right). Pupa. 68. Thorax, lateral. 69. Abdominal tergites. 70. Posterolateral comb of segment VIII. Larva. 71. Antenna. 72. Clypeal seta S 3. 73. Mandible. 74. Mentum and ventromental plate.