Caladomyia canine, Trivinho-Strixino, Susana, 2012

Trivinho-Strixino, Susana, 2012, A systematic review of Neotropical Caladomyia Säwedal (Diptera: Chironomidae), Zootaxa 3495, pp. 1-41 : 16-18

Caladomyia canine sp. n.

( Figs 27–31 )

Type material. Holotype: male with pupal exuviae (in Euparal), BRAZIL, SP, Cananéia, Córrego Longe (24° 53’ S, 47° 51’ W), leg. F. O. Roque, 15/vii/2001; (C1–02, LEIA /UFSCar). Paratype: pupal exuviae (in Euparal), as holotype except by Córrego Chefão (24° 53’ S, 47° 58’ W); (C1–03, LEIA /UFSCar).

Etymology. From the indigenous Tupi language “ Canine ” the name of a native Indian woman that loved the Lusitanian colonizer of the Cananéia municipality of the southeast of São Paulo state. The name is to be regarded as a noun in apposition.

Diagnostic characters. Caladomyia canine sp. n. differs from other species of the genus by the combination of the following characters. Adult male: hypopygium with anal tergite bands of Y-type, fused part 52 µm long; anal tergite setae absent; anal point 45 µm long, with posterior ending divided in three protrusions; bars 21 µm long; digitus not reaching median margin of superior volsella. Pupa: pupal exuviae with rugose frontal apotome without cephalic tubercle; thorax without granulation and with very long precorneals setae; thoracic horn elongate without setae; tergite III and IV with longitudinal paired patches of long and fine spines; tergite V with paired oval patches of simple spinules; tergite VI with paired rounded patches of simple and multiple spinules.

Description

Male (n = 1)

Dimensions. Small, length about 1.4 mm. Wing length 1.57 mm.

Coloration. Head yellowish brown, flagellum and maxillary palp pale brown. Thorax yellowish green. Abdomen yellowish. Legs yellowish.

Head. Eyes ratio 0.8. Antennal basal flagellomeres 406 µm long; maxillary palp lost. Frontal tubercles short, 5 µm long. Temporal setae 7, uniserial. Clypeus with 16 setae.

Thorax. Ac 6 biserial, beginning near antepronotum; Dc 4; Pa 1, Scts 4. Halteres with 3 setae.

Wing. Width 0.43 mm. VR 0.8. WW 0.27. Membrane covered with setae, becoming dense in distal ½.

Legs. Leg I and tarsal segments of middle and hind legs lost. Mid and hind tibiae with black combs each one with one spur. Lengths of femur and tibia of mid and hind legs: 706, 762; 587, 825 μm respectively.

Hypopygium ( Fig. 27 ). Anal tergite 67 µm long. Anal tergite bands Y-type; fused part about 52 µm long. Anal point 45 µm long, lateral margins with 4 setae; posterior ending divided in three protrusions; median protrusion 4 µm long; AnPr 3.0. Anal point bars short 21 µm long, on basis of anal point, their tips not reaching apex of anal point; AnPBR 2.5. Superior volsella subrectangular 35 µm width, with 5 dorsal setae and 3 setae on anterior part of internal margin (two dorsal, one ventral). Digitus 29 µm long, not reaching beyond posteromedian corner of superior volsella. Inferior volsella 75 µm long. Median volsella short 23 µm long, with 2 lamelliform and 4 simple setae. Gonostylus 75 µm long. Hypopygium ratio 0.55.

Pupal exuviae (n = 2)

Dimensions. Small, abdomen length about 2.6 mm. Coloration yellowish brown. Wing sheath 938 µm with short nose.

Cephalothorax ( Fig. 28 ). Frontal seta elongate, slender, near 32 µm long; cephalic tubercles absent. Thoracic horn bare slender and somewhat rugose. Thorax smooth with weak granulation close to median suture. Wing sheath with short nose. Thoracic setation on both sides: 3 very long precorneals (PC1–3) situated in front of the thoracic horn basal ring; PC1 156 µm, shorter than PC2 and PC3 (405 µm long).Two lateral antepronotals (Laps). Four dorsocentrals (DC1–4) situated in two widely separated pairs; distance between D C1– D C3 206 µm.

Abdomen ( Fig. 29 ). Tergite I bare; II with central field of fine shagreen; T III with paired long bands of hairlike fine spines, curved and slightly divergent posteriorly; T IV with a paired long bands of hair-like fine spines in semi curved line; V with anterior pair of semioval patches of short spinules; T VI with an anterior pair of oval patches of bifid and trifid spinules ( Fig. 30 ); T VII–VIII bare. Hook row continuous, occupying 2/3 width of segment II. Segment VII with large posterolateral comb consisting of 13–15 marginal large teeth and several overlapping ventral teeth ( Fig. 31 ). Anal lobe well developed with complete fringe of about 28–30 taeniae and 2 large dorsal taeniae on each side. Segments II–III with 3 L setae; segments IV with 2 L setae and 1 ta seta; segment V–VI with 3 ta setae; segment VII with 4 ta setae; segment VIII with 5 ta setae.

Remarks. The shape of the superior volsella is the main characteristic that differentiates the male of C. canine sp. n. from other species. The patterns and distribution of abdominal spines and spinules and the length of the precorneals setae distinguish the pupa of this species from others.

The specimens were collected on bottom sediments of streams in littoral zone of southeast of São Paulo State.

Figures

FIGURES 27 – 31. Caladomyia canine sp. n. Male. 27. Hypopygium, dorsal (left), ventral (right). Pupa. 28. Thorax, lateral. 29. Abdominal tergites. 30. Spine patches of tergite III – VI. 31. Posterolateral comb of abdominal segment VIII.