Conchapelopia currani (Walley)

Saether, Ole A., 2011, Notes on some tanypods from Lake Winnipeg, Manitoba, Canada (Diptera: Chironomidae), Zootaxa 3069, pp. 26-42 : 33-34

cf. Conchapelopia currani (Walley)

( Fig. 5 E–H)

Material examined. CANADA: Manitoba, Lake Winnipeg, 20 mile Creek, 1 male, 26.viii. 1971; South Basin, 1 larva, 9. –17. vii. 1969; Narrows, 1 larva, 9. –17. vii. 1969; North Basin, 1 larva, 9. –17. vii. 1969,

Fourth instar larva (n = 2)

Total length 5.09–7.29 mm. Head capsule length 0.79–0.82 mm. Submentum with dark spot at occipital margin.

Head. Apex of antenna as in Fig. 5 E. Lengths of antennal segments (in µm): 305–313, 54–56, 10, 3, 2. AR 4.24–4.29. Basal antennal segment 28 µm wide, ring organ 0.68 from base, blade 61 µm, accessory blade 56 µm long. Style at apex of second segment 11 µm long. Apex of labrum as in Fig. 5 F. Mandible 158–163 µm long. Basal segment of maxillary palp ( Fig. 5 G) 60–62 µm long, 16–18 µm wide, 3.33–3.88 times as long as wide. Ligula ( Fig. 5 H) 108–110 µm long. Paraglossa ( Fig. 5 H) 43–48 µm long.

Abdomen. Body with long hairs 0.7–0.8 times as long as width of segments. Procercus 120–126 µm long, 50 µm wide, 2.40–2.52 times as long as wide. Anal setae 615–800 µm, supraanal seta 590–711 µm, supraanal seta/ anal setae 0.89–0.96. Anal tubules 210–260 µm long. Posterior parapods 491–680 µm long, with 4 darker claws.

Distribution. C. currani is known from Manitoba to Québec, Ontario, New York, Iowa, Ohio, Wyoming and south to Mississippi and Florida ( Roback 1971: 249, Oliver et al. 1990: 8, Epler 2010).

Helopelopia pilicaudata (Walley) ( Fig. 4 A–D)

Material examined. CANADA: Manitoba, Lake Winnipeg, 10 km off (Sturgeonskin point) Long Point, 1 male, 14.vii. 1969; Beaver Point, 1 male, 30.vi. 1971.

Male (n = 1–2). Total length 6.05–6.20 mm. Wing length 3.36–3.48 mm. Total length/wing length 1.78–1.80. Wing length/profemur 2.50–2.59. Tergite I with anterior infuscation, tergite II slightly infuscated in anterior 1/3, tergites III–VI more strongly infuscated in anterior 1/3, about anterior 3/4 of tergite VII and VIII infuscated.

Head. AR 2.26–2.48. Temporals 25–30. Clypeus with 21–28 setae. Cibarial pump, tentorium, and stipes as in Fig. 4 A. Tentorium 263 µm long. Palp lengths (in µm): 80–83, 163–193, 220–224, 252–253, 418–422.

Thorax. Antepronotum with 11–13 setae. Dorsocentrals 35–45, acrostichals 37–45, prealars 27–29. Scutellum with 42–53 setae.

Wing. VR 0.82–0.97. Brachiolum with 2 setae, R with 111 setae, R1 with 118 setae, R4+5 with 162 setae. Squama with 45–54 setae.

Legs. Spur of front tibia 53–57 µm long, spurs of middle tibia 82–87 µm and 77–80 µm long, of hind tibia 113– 123 µm and 70 µm. Width at apex of front tibia 73–83 µm, of middle tibia 90–93 µm, of hind tibia 87–93 µm. Sensilla chaetica and pseudospurs absent. Lengths and proportions of legs as in Table 1.

fe ti ta1 ta2 ta3 ta4 p1 1345 1698–1799 1311 775–782 558–564 374 p2 1462–1479 1395–1429 1009–1025 500–510 347–354 280–300 p3 1311–1345 1984–2118 1462–1492 877–884 646–653 401–408

continued.

ta5 LR BV SV BR p1 190–197 0.73–0.77 2.28–2.34 2.34–2.40 8.5 p2 143–160 0.72 2.97–3.04 2.83–2.84 6.4 p3 180–184 0.71–0.74 2.26–2.33 2.28–2.29 6.6–7.8 Hypopygium ( Fig. 4 B–D). Tergite VIII with brush of setae arranged about as in H. pilicaudata (Walley) ( Roback 1971 fig. 450). T IX with 16–18 setae. Phallapodeme 197–229 µm long. Gonocoxite 250–266 µm long, inferior volsella ( Fig. 4 D) 127 µm long, apical lobes each with 8–9 up to 62 µm long taeniae, lateral lobes each with 13 up to 52 µm long taeniae; gonostylus ( Fig. 4 C) 273–300 µm long. HR 0.89–0.92, HV 2.02–2.27.

Remarks. According to B. Bilyj (pers. comm.) there are two, possibly, three cryptic species that key out as H. pilicaudata . The main distinguishing character is the preapical spine on the gonostylus. This became evident when the associated pupae were observed to be different, although the character limits have yet to be determined. Unfortunately the holotype is still pinned in the CNC collection thus the true form of the spine for the species is not known. Therefore all H. pilicaudata should be considered as a species complex. The lateral lobes of basal volsella are more extended laterally in the present specimen compared to Roback’s (1971, fig. 449)

Distribution. H. pilicaudata is known from the Northwest Territories, New Brunswick, Ontario, Quebec, New York and North Carolina ( Oliver et al. 1990: 12; Epler 2003, 2010; Ashe & O’Connor 2009: 162).

Figures

FIGURE 4. Helopelopia pilicaudata (Walley), male (A – D). A — cibarial pump, tentorium and stipes; B — hypopygium; C — gonostylus; D — aedeagus. E — Conchapelopia telema Roback, male, cibarial pump, tentorium and stipes.

FIGURE 5. Tanypodinae immatures. A – D, cf. Helopelopia pilicaudata (Walley), larva, antennal apex (A), labral apex (B), maxillary palp (C), ligula, paraligula and hypopharyngeal pecten (D); E – H, cf. Conchapelopia currani (Walley), larva, antennal apex (E), labral apex (F), maxillary palp (G), ligula, paraligula and hypopharyngeal pecten (H); I – L, Telopelopia okoboji (Walley), larva, antennal apex (I), labral apex (J), ligula, paraligula and hypopharyngeal pecten (K), thoracic horn and comb of pupa (L); M — Larsia canadensis Bilyj, larva, antennal apex.