Thienemanniella liae Paggi

Wiedenbrug, Sofia, Lamas, Carlos E. & Trivinho-Strixino, Susana, 2013, A review of Neotropical species in Thienemanniella Kieffer (Diptera, Chironomidae), Zootaxa 3670 (2), pp. 215-237 : 223

Thienemanniella liae Paggi

( Fig. 4 )

Thienemanniella liae Paggi, 2007: 3 males, 1 male with pupal exuviae, 1 female, 1 mature female pupa, 3 pupae, 3 pupal exuviae, 2 prepupae, 13 larvae. Type locality Argentina.

Material examined. Holotype male; ARGENTINA, Buenos Aires province, Sierra de la Ventana, Sauce Grande Stream, 38°53’S, 61°58’W, 26.III.1994, light trap, A. C. Paggi ( MLP). Allotype female; same data as holotype. 7 larvae, together with other undetermined larvae, 1 pharate female with pupal exuviae, and 1 pupal exuviae, Rio Negro province, Neuquen, Limay river, Picaza, 39°35’S, 70°08’W, Surber sample, 25.II.1998, A. C. Paggi ( ILPLA). 1 male with pupal exuviae, same data as before but Limay river, Taux, Surber sample, 24.II.1998, A. C. Paggi ( MLP).

Diagnostic characters. T. liae belongs to the T. spreta group. The brownish larval head capsule with small ventral spinules is characteristic. The adult and pupa are not easy to identify, but according to the measurements given for the male by Paggi (2007) – total length 1.17–1.39 mm, wing length 0.86–1.15 mm – the male is larger than those of other species mentioned here. Also, the brown tergites I–V (except for white setal bases) and the gonostylus without crista dorsalis may help to distinguish this species. The pupal abdominal armament pattern is similar to that in other species of the group, but sternite I is bare in the specimens examined, whereas in the other species of the group there is very fine shagreen.

Additions to previous description. Pupa (n = 2). Tergites III–V with posterior spinules slightly larger and wider ( Fig. 4 B) than those preceding them on the respective tergite; tergites VI–VIII with anteromedian shagreen of spinules slightly longer than on remainder of tergite. Sternite I bare, II with elongated spinules ( Fig. 4 A), III– VIII with homogeneous shagreen of short spinules; on male exuviae, sternites VII and VIII with a posterior row of larger spinules. Male genital sac with apical inner margin oblique ( Fig. 4 C).

Larva (n = 7). Head capsule and antenna brown; head ventral integument with very small spinules; mentum with first lateral teeth adpressed to outer median teeth.

Remarks. On the holotype and the paratype male examined, the superior volsella has a well sclerotized posterior margin, but it was impossible to discern the median margin of this structure.

Figures

FIGURE 4. Thienemanniella liae Paggi, pupa. A. Sternite II. B. Tergite III. C. Segments VII – IX and anal lobes in dorsal (left) and ventral view (right).