Tanytarsus alatus Paggi (1992)

Donato, Mariano, Arpellino, Juan Pablo Zanotto & Siri, Augusto, 2020, Description of the pupa of Tanytarsus alatus Paggi (1992) (Chironominae: Tanytarsini), CHIRONOMUS Journal of Chironomidae Research 33 (33), pp. 64-67 : 64-66

Tanytarsus alatus Paggi (1992)

( Figs 1A–I )

Tanytarsus alatus Paggi 1992: 302 .

Caladomyia alata Sanseverino and Fittkau 2007: 266 (new combination).

Tanytarsus alatus, Lin et al. 2018: 667 (new combination).

Material examined. ARGENTINA: 1 pharate pupa, Buenos Aires, Carnaval stream, 34.870588° S, 58.089776° W, 07-ix-2017, D-net, J.P. Zanotto Arpellino ( ILPLA); 5 pupal exuviae, Buñirigo stream , 35.143919° S, 57.570168° W, 07-viii-2018, D-net, J.P. Zanotto Arpellino ( ILPLA) .

Pupal exuviae (n = 6)

Color: slightly brownish. Total length 3.83–4.7 (5) mm; cephalothorax length 0.84–1.2 mm (5); abdomen length 2.82–3.5 mm (5).

Cephalothorax. Frontal setae elongate, slender, 118–144 (5) μm long; cephalic tubercles present ( Fig. 1B ). Thoracic horn slender with small pores ( Figs 1 D-E). Thorax smooth; wing sheath with short nose. Thoracic setation: 3 precorneals: 144–176, 116–170, 126–142 (5) μm long, and 2 lateral antepronotals. Dc1–4 present and situated in two groups widely separated; distance between Dc1–Dc3 217–284 μm.

Abdomen ( Fig. 1A ). Tergite I bare; T II with central field of fine shagreen; T III with longitudinal paired bands of long spines ( Fig. 1F ); T IV with a paired long bands of hair-like fine spines in slightly curved line ( Fig. 1G ); T V – VI with anterior pair of semi-oval patches of short single spinules ( Figs 1H–I ); T VII bare. T VIII with anterior paired patches of fine shagreen. Hook row continuous, with approximately 200–250 hooklets. Segment VIII with posterolateral combs consisting of 5–10 large marginal teeth and 14–31 overlapping ventral teeth ( Fig. 1C ). Anal lobe with an oval field of fine shagreen; 37–48 taeniae and 2 dorsal setae taeniae. Segment II with 3 L setae; segments III–IV with 3 setae, middle setae teniate; segment V – VI with 3 teniate setae; segment VII with 4 taeniae; segment VIII with 5 taeniae.

Figures

Figure 1. Tanytarsus alatus Paggi (1992) pupa. A) abdomen, dorsal view; B) frontal tubercles; C) posterolateral comb of abdominal segment VIII; D) thoracic horn; E) detail of the pores in the thoracic horn; F) patch on tergite III; G) patch on tergite IV; H) spinules on tergite V; I) spinules on tergite VI. Scale bar = 10 µm, except otherwise stated.