Macropelopia rossaroi Lencioni & Marziali 2005

Michailova, Paraskeva, Kownacki, Andrzej, Woźnicka, Olga, White, Keith, Dean, Andrew & Szarek-Gwiazda, Ewa, 2014, Macropelopia nebulosa group (Diptera, Chironomidae, Tanypodinae) — karyotype and morphology of larvae and pupae, Zootaxa 3852 (1), pp. 83-100 : 95-96

Macropelopia rossaroi Lencioni & Marziali 2005

Larva is undescribed.

Pupal exuviae (n = 7, from Tatra) 8–9 mm long, with characteristic abdominal pigmentation patterns similar to M. nebulosa ( Figure 13 C).

Thoracic horn flattened ( Figure 13 A1), ± 1000 µm long, covered with small scales, index of plastron plate 0.39–0.4, the lower edge of plastron plate with row of light spots ( Figure 13 A2), respiratory atrium narrow. Thorax with outer edge corrugated ( Figure 13 B).

Spines of abdominal shagreen in groups ( Figure 13 G). Tergites II–V with transverse posterior band of larger teeth and conjunctives II/III, III/IV, IV/V, V/VI VI/VII, VII/VIII with fine shagreen ( Figure 13 H). Dorsal setae D1 arising from a low, poorly chitinised tubercle on tergites II–VI ( Figures 13 E, 13F), on tergite VII tubercle reduced. Seta D3 on tergites III–V no longer than seta D1, distally not hooked ( Figure 13 F). Lateral setae on I–VI segment simple, very short. Segment VII with 6 long taeniate L setae, VIII with 5.

Anal lobe large, about 2x long as segment VIII ( Figure 13 D), outer border slightly convex with 2 strong setae on basal part and dense fringe of hair-like setae on 2/3 border, end of anal lobe sharpened and on outer and inner border with spinules.

Adult males. Description according to Lencioni & Marziali (2005).

Ecology and distribution. On the first occasion larvae, pupae, pupal exuviae and adult males were collected and described from two glacial ponds at 2455 m a.s.l. in Val de la Mare, Stelvio National Park, Italy; on the second time 7 pupal exuviae from lakes Czarny Staw (1580 m a.s.l.; N 49o 11’20.03’’, E 20o4’52.58’’) and Morskie Oko (1393 m a.s.l.; N 49o11’37.36’’, E 20o4’29.02’’) in Tatra National Park, Poland were found.

Comments. Lencioni & Marziali (2005), in describing Macropelopia rossaroi , suggested that the pupae of the new species could be associated with Macropelopia spec. Norwegen ( Fittkau 1962). Their description of pupal exuviae is very laconic and the authors suggest that this species differs in thoracic horn structure. Langton (1991) described Macropelopia spec. Norwegen giving the following features: exuviae larger then nebulosa , seta D3 as in nebulosa . Pupal exuviae from the Tatra Mountains have a thoracic horn similar to the one observed in pupae collected from Italy and Norway but they are smaller than nebulosa and D3 is the same length as D1.

Figures

FIGURE 13. Macropelopia rossaroi Lencioni, Marziali; pupa A 1 — thoracic horn; A 2 — plastron plate; B—arrangement of suture; C—segment IV – VI dorsal; D—lateral setation of segment VII and anal segments; E—part of segment IV; F—seta D 1; G—armament of tergites; H—transverse posterior band of teeth on the tergites.