Caladomyia comunis, Trivinho-Strixino, Susana, 2012

Trivinho-Strixino, Susana, 2012, A systematic review of Neotropical Caladomyia Säwedal (Diptera: Chironomidae), Zootaxa 3495, pp. 1-41 : 26-29

Caladomyia comunis sp. n.

( Figs 49–52 )

Type material. Holotype: male, BRAZIL, SP, Ubatuba (Picinguaba) (23º20’S, 44 50’W) 24/ix/2001, leg. F. O. Roque (C1–45, LEIA /UFSCar). Paratypes. 1 male with pupal and larval exuviae, Capão Bonito, Córrego Araçá, Parque Estadual de Intervales (24° 18’ S, 48° 25’ W), leg. Monica Morraye (C1–46, LEIA /UFSCar); 1 male, Cubatão, Córrego Cambuci,(23° 54’ S, 46° 28’ W), 4/ii/2003, leg. F. O. Roque (C1–47, LEIA /UFSCar); 1 male, Cananéia, (24° 53’ S, 47° 51’ W), 16/xi/2002, leg. F. O. Roque (C1–48, LEIA /UFSCar).

Etymology. The name “ comunis ” refers to the numerous localities where the species was collected.

Diagnostic characters. Caladomyia comunis 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 1.20; fore leg ratio 3.0; hypopygium with anal tergite bands of Y-type, fused part 31 µm long; anal point 32 µm long with posterior ending divided in three protrusions; bars 21 µm long; digitus 24 µm long, not trespassing posteromedian margin of superior volsella. Pupa: frontal apotome wrinkled, without cephalic tubercle; thorax with weak granulation close to anterior median suture; tergite III and IV with paired band of spines; T V with anterior paired patches of short spines.

Description

Male (n = 3)

Dimensions. Small, length about 2.01 mm. Wing length 1.00– 1.44 mm.

Coloration. Head, thorax and abdomen yellow, legs white brown. Wing membrane transparent.

Head. Frontal tubercles 6–8 µm long. Antennal flagellum 575–937 µm long; AR 1.13–1.20. Palpomere 2–5 lengths: 37, 75, 87, 169 µm. Temporal setae 5–6, uniserial. Clypeus with 11–12 setae.

Thorax. Ac 12–13, biserial beginning near antepronotum; Dc 7–8; Pa 1; Scts 4. Halteres with 5 setae.

Wing. Width 0.32–0.40 mm. VR 1.10–1.30. 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 10.

fe ti ta1 ta2 ta3 ta4 ta5 LR p1 525–800 237–362 644–998 312–531 262–444 175–356 94–150 2.71–2.75 p2 481–737 387–581 219–269 94–112 69–81 44–50 37–44 0.46–0.56 p3 500–800 500–712 294–400 169–225 156–200 87–119 69–75 0.56–0.60 Hypopygium ( Fig. 49 ). Anal tergite near 60 µm long, with 2 distal setae. Anal tergite bands Y-shaped; fused part about 31–37 µm long. Anal point 26–32 µm long, with slightly concave margins and posterior ending divided in three protrusions; lateral margin bearing 3 setae. AnPR 1.8–2.3. Anal point bars 22–27 µm long, their tips not reaching beyond apex of anal point; AnPBR 1.3–1.5. Superior volsella robust, somewhat quadrangular; posteromedian corner with a prominent lobe. Digitus 20–27 µm long, not trespassing median corner of superior volsella. Median volsella short, with 2 lamelliform and 4 simple setae. Gonostylus 70 µm long. Hypopygium ratio 0.81–0.92.

Pupal exuviae (n = 1)

Dimensions. Length of abdomen near 1.9 mm.Wing sheath 800 µm.

Coloration yellow.

Cephalothorax. Cephalic tubercles absent. Frontal setae not discernible. Thoracic horn slender and smooth, near 76 µm long. Thorax with weak granulation close to median suture; scutal tubercle absent.Wing sheath with short nose; pearl row absent. Thoracic setation on both sides: 3 precorneals (Pc1–3), 128, 91, 82 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 195 µm.

Abdomen. Tergite I bare; II with central transverse field of fine shagreen; T III with posteromedian paired curved bands of long spines diverging posteriorly; T IV with anterior paired bands of median size spines diverging posteriorly; V with paired patches of short single spines; T VI–VIII bares ( Figs 50 and 51 ). Hook row continuous, occupying near 1/3 width of segment II. Segment VIII with posterolateral combs consisting of 7–8 large marginal teeth and 30 or more overlapping ventral teeth ( Fig. 52 ). Anal lobe with 18–20 taeniate setae and 2 dorsal taeniae. Segments II–III with 3 L setae; segment IV with 2 L setae and 1 taenia; segments V–VI with 3 taeniae; segment VII with 4 taeniae; segment VII with 5 taeniae.

4th instar larva exuviae (n = 1)

Head. Width 219 µm, length 268 µm; IC 0.82. Antenna with 5 segments, on prominent pedestal, 49 µm long without spur; basal segment 2.5 times as long as flagellum, with basal ring organ and small seta in distal 2/3; Lauterborn organs and pedicels missing. Clypeal (S3) simple. Mandible with pale dorsal tooth; apical and two inner teeth brown. Mentum 60 µm long, with pale median tooth slightly notched laterally, 5 pairs of lateral teeth brown, decreasing in size laterally. Ventromental plates 75 µm long, close together medially.

Remarks. The main characteristic that differentiates the male of C. comunis sp. n. from other species is the shape of the superior volsella with prominent posterior lobe.

Figures

FIGURES 49 – 52. Caladomyia comunis sp. n. Male. 49. Hypopygium, dorsal (left), ventral (right). Pupa. 50. Abdominal tergites. 51. Spines of tergites III – V. 52. Posterolateral comb of abdominal segment VIII.