Oukuriella sublettei Messias & Oliveira

Bellodi, Carolina Ferraz, Fusari, Lívia Maria & Roque, Fabio De Oliveira, 2016, New species and records of Oukuriella Epler, 1986 from the Neotropical region (Diptera: Chironomidae), Zootaxa 4078 (1), pp. 187-196 : 193-196

Oukuriella sublettei Messias & Oliveira

Oukuriella sublettei Messias & Oliveira, 1998: 260 . ( Figures 5–6 )

Material studied. 1 male with associated pupal and larval exuviae, BRAZIL, São Paulo, Campos do Jordão, Parque Estadual de Campos do Jordão, 22º41’40”S, 45º27’36”W, manual collection, submerged wood, leg.: Valente Neto, F. ( MZUSP)

Description pupa.

Pupa exuviae (n = 1). Total lenght 4.95 mm. Exuviae light brown.

Cephalothorax. Frontal apotome smooth ( Fig. 5 A), frontal setae with 53 Μm long. Thoracic horn formed by a filament coming directly from the basal ring: this filament is subdivided into 2 strands with small spines. Basal ring elliptical ( Fig. 5 C) with 27 Μm diameter. Thorax with median suture with granulations ( Fig. 5 A). Antepronotals setae unobservable. Two setae precorneals. Four dorsocentrals: Dc1 with 25 Μm long, Dc2 with 10 Μm, Dc3 unobservable, Dc4 with 10 Μm. Dc 1 in front of Dc2 by a distance of 30 Μm, Dc2 a 169 Μm in front of Dc3 and Dc3 a 11 Μm in front of Dc4.

Abdomen ( Figs 5 D–E). Tergite I bare; shagreen the other tergites as the generic diagnosis. Conjunctive IV/V with rows of spinules. Row of hooks on tergite II with 316 Μm long. Pedes spurii B present in TII. Anal spur with 93 Μm long, formed by 1 main spur and 9 spinules ( Fig. 5 D). Lateral setae in the segments II–VIII, 3, 3, 3, 4, 4, 4, 4; lateral setae in the segments V–VIII taeniate, others with single setae. All tergites with a pair of oral seta. Anal lobe with complete fringe, with 34 setae ( Fig. 5 E). Male genital sac not extending beyond anal lobe.

Description larva.

Larval exuviae (n = 1).

Head. Labral sclerites 1–5 fused. Dorsal surface of sclerites 1 and 2 granulose, and sclerites 3–5 striate/rugose ( Fig. 6 A). Pecten epipharyngis unobservable. Premandible distally bifid, with 119 µm long. Antenna 137 µm long, with 6 segments ( Fig. 6 B), 63, 19, 16, 18, 11, 5 µm long; AR = 0.91, antennal blade smaller than flagellum, with 63 µm long. Lauterborn organs alternately located at the apices of segments 2 and 3. Mandible with 159 µm long, with dark apex and 3 inner teeth, dorsal tooth present, internal setae present, and subdentalis setae short ( Fig. 6 C). Mentum with 146 µm wide, median tooth simple, short and pale, and five pairs of lateral teeth dark ( Fig. 6 D). First lateral tooth much larger relative to the median, second to fourth laterals of same height, fifth lateral tooth truncated, lateral teeth dark. Ventromental plates 100 Μm wide, medially separated by distance between the first two lateral teeth. Two setae submenti with 58 and 53 µm long.

Female. Unknown.

Distribution. This species was previously recorded from the State of Amazonas, Brazil; in the present study the range is extended to include the State of São Paulo, Brazil.

Comments. The submerged wood was collected in first-order streams protected by riparian vegetation and characterized by rocky beds and clear water in the Atlantic Forest. In the laboratory, the wood was fragmented and the larvae found inside were reared individually in separate containers.

Figures

FIGURE 5. Oukuriella sublettei Messias & Oliveira, 1998, Pupa: A. frontal apotome; B. cephalothorax; C. basal ring; D. spur anal; E. tergites I – IV; F. tergite VIII and anal lobe.

FIGURE 6. Oukuriella sublettei Messias & Oliveira, 1998, Larva: A. frontoclypeal apotome; B. antenna; C. mandible; D. mentum.