Caladomyia curumim, Trivinho-Strixino, Susana, 2012

Trivinho-Strixino, Susana, 2012, A systematic review of Neotropical Caladomyia Säwedal (Diptera: Chironomidae), Zootaxa 3495, pp. 1-41 : 29-31

Caladomyia curumim sp. n.

( Figs 53 60 )

Type material. Holotype: male with pupal and larval exuviae, BRAZIL, SP, Cananéia, Córrego da Gruta (24° 53’ S, 47° 51’ W), leg. F. O. Roque, 12/xi/2003 (C1–13, LEIA /UFSCar).

Etymology. From the indigenous Tupi language, Curumim , meaning indigenous children. The name is to be regarded as a noun in apposition

Diagnostic characters. Caladomyia curumim sp. n. differs from all other species of the genus by the combination of the following characters. Adult male: thorax and abdomen green yellowish; AR 0.44; hypopygium with anal tergite bands of Y-shape, fused part 34 µm long; anal point 24 µm long with posterior ending divided in three protrusions; bars 15 µm long; digitus 34 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; lateral antepronotal setae (Lap) surrounded by short spinules; tergite III with longitudinal paired band of long spines; T IV–V with pair of inverted L-shaped bands of long spines. Larva: Antennal pedestal without spur; clypeal S3 simple.

Description

Male (n = 1)

Dimensions. Small, length about 2.06 mm.Wing length 0.918 mm.

Coloration. Head yellow, flagellum and maxillary palp pale brown. Thorax, abdomen and legs yellow. Head. Frontal tubercles short, 5 µm long. Antennal flagellum 687 µm long; AR 0.44. Palpomere 2–5 lengths: 18, 69, 87, 131 µm. Temporal setae 7, uniserial. Clypeus with 13 setae.

Thorax. Ac 12, biserial, beginning near antepronotum; Dc 5; Pa 1; Scts 5. Scutal tubercle absent.Halteres with 4 setae.

Wing. Width 0.30 mm; VR 1.27. Brachiolum with 1 seta; squama bare.

Legs. Front tibia with short white spur. Mid tibia with two black combs, each one with 2 unequal one spur. Lengths of femurs p1 437, p2 462, p3 444 µm; tibiae p1 200, p2 419 µm.

Hypopygium ( Fig. 53 ). Anal tergite near 49 µm long, with 2 distal setae. Anal tergite bands Y-shaped; fused part about 34 µm long. Anal point 24 µm long, with slightly concave margins; lateral margin bearing 3 setae. AnPR 2.4. Anal point bars short, 15 µm long, their tips not reaching apex of anal point; AnPBR 2.5. Superior volsella with 3 dorsal setae and 3 on anterior part of median margin. Digitus 34 µm long, reaching well beyond median corner of superior volsella; apex rounded. Median volsella short, 9 µm long, with 2 lamelliform and 4 simple setae. Gonostylus 40 µm long. Hypopygium ratio 1.23.

Pupal exuviae (n = 1)

Dimensions. Small, abdomen length about 1.8 mm.Wing sheath 606 µm. Coloration yellow-brown.

Cephalothorax ( Fig. 54 ). Frontal setae elongate, slender, 61 µm long; cephalic tubercles absent. Thoracic horn slender and smooth. Thorax with weak granulation close to median suture; wing sheath with short nose ( Fig. 54 ). Thoracic setation on both sides: 3 precorneals (Pc1–3), 72, 175, 143 µm long, and 2 lateral antepronotals (LAps1–3); LAps3 surrounded by spinules. Dc1–4 present and situated in two groups widely separated; distance between D C1–D C3 238 µm.

Abdomen. Tergite I bare; T II with central transverse field of fine shagreen; T III with longitudinal pair of long spines; T IV–V with pair of inverted L-shaped bands of long spines ( Figs 55 and 56 ); T VI–VII bare. Hook row continuous, occupying near 1/3 width of segment II. Segment VIII with posterolateral combs consisting of 1 large marginal tooth and 12–15 overlapping ventral teeth ( Fig. 57 ). Anal lobe with 13–14 taeniae and 2 dorsal setae taeniae. Segments II–IV with 3 L setae; segments V–VII with 3 taeniae; segment VIII with 5 taeniae.

4th instar larval exuviae (n = 1)

Head. Antenna pedestal 55 µm long, without spur ( Fig. 58 ). Antennal segments lost. Clypeal (S3) simple. Premandible with 3 teeth; brush well developed. Mandible with pale dorsal tooth; apical and two inner teeth brown ( Fig. 59 ). Mentum 63 µm long, with pale median tooth and 5 pairs of lateral teeth brown, decreasing in size laterally ( Fig. 60 ).

Remarks. The long and stout digitus with a broadly rounded apex is the main characteristic that differentiates C. curumim sp. n. from other species, except C. adalberti . In this case, the shape of superior volsella can separate them. The patterns and distribution of spines on abdominal tergite and the presence of short spinules surround the lateral antepronotal LAps3 distinguish the pupa of this species from all others species of the genus.

Figures

FIGURES 53 – 60. Caladomyia curumim sp. n. Male. 53. Hypopygium, dorsal (left), ventral (right). Pupa. 54. Thorax, lateral. 55. Abdominal tergites. 56. Spines of tergites III – V. 57. Posterolateral comb of abdominal segment VIII. Larva. 58. Antennal pedestals and clypeal setae S 3. 59. Mandible. 60. Mentum and ventromental plate.