Helopelopia pilicaudata (Walley),

Saether, Ole A., 2011, Notes on some tanypods from Lake Winnipeg, Manitoba, Canada (Diptera: Chironomidae), Zootaxa 3069, pp. 26-42: 34

publication ID

http://doi.org/ 10.5281/zenodo.201708

persistent identifier

http://treatment.plazi.org/id/B736ED54-FFE0-C20E-8B8C-B3E6B96371C8

treatment provided by

Plazi

scientific name

Helopelopia pilicaudata (Walley)
status

 

cf. Helopelopia pilicaudata (Walley) 

( Fig. 5View FIGURE 5 A –D)

Material examined. CANADA: Manitoba, Lake Winnipeg: South Basin, 1 larva, 3.– 12. x. 1969; Narrows, 1 larva, 9.– 17. vii. 1969; North Basin, 5 larvae 9.– 17. vii., 1969.

These larvae may belong to Helopelopia  according to Epler (2001, couplet 36).

Fourth instar larva (n = 1–3)

Total length 6.12–11.33 mm. Head capsule length 0.99–1.08 mm.

Head. Apex of antenna as in Fig. 5View FIGURE 5 A. Lengths of antennal segments (in µm): 415 –440, 73–81, 7–9, 3–4, 2. AR 4.44–4.66. Basal antennal segment 30–35 µm wide, ring organ 0.67–0.70 from base, blade 76–86 µm. Style at apex of second segment 12 µm long. Apex of labrum as in Fig. 5View FIGURE 5 B. Mandible 210–244 µm long. Basal segment of maxillary palp ( Fig. 5View FIGURE 5 C) 72–90 µm long, 14–22 µm wide, 3.91–5.14 times as long as wide. Ligula ( Fig. 5View FIGURE 5 D) 114–128 µm long. Paraglossa ( Fig. 5View FIGURE 5 D) 46–48 µm long.

Abdomen. Body with long hairs 0.8 –1.0 times as long as width of segments. Procercus 156–170 µm long, 50– 53 µm wide, 2.94–3.20 times as long as wide. Anal setae 920 µm, supraanal seta 620 µm, supraanal seta/anal setae 0.67. Anal tubules 290–340 µm long. Posterior parapods 689–810 µm long, with 3–4 very slightly darker claws.

Third instar larva (n = 3)

Total length 4.61–6.11 mm. Head capsule length 0.64 mm.

Head. Lengths of antennal segments (in µm): 230 –238, 46–48, 7–8, 2–3, 1. AR 3.90–4.30. Mandible 134–138 µm long.

Abdomen. Procercus 90–106 µm long, 34–38 µm wide, 2.37–3.06 times as long as wide.

Remarks. The larvae of Helopelopia Roback  are larger than larvae of Conchapelopia Fittkau  ( Roback 1981: 100, Epler 2001 couplet 36). The present specimens are larger than mentioned by Roback (1981) for H. cornuticadata (Walley)  and since H. pilicaudata  is present in Lake Winnipeg likely belong to that species or species complex.