Cryptotendipes Lenz

Saether, Ole A., 2010, Cryptotendipes Lenz from Manitoba, Canada, with keys to known immatures of the genus (Diptera: Chironomidae), Zootaxa 2412, pp. 1-20 : 17

Key to known pupae of Cryptotendipes Lenz

1. Tergites (T) and sternites (S) with long, distinct, spine-covered caudal tubercles, at least 2 tubercles on each of T II– V; T II without caudal hooklets .................................................................................................................................... 2

- Tergites and sternites with caudal spines not on long tubercles, spines forming complete row at least on T III–V; T II nearly always with hooklets ......................................................................................................................................... 4

2. T II–VII each with 2 long, caudal tubercles; S III–VIII with long, single tubercle which usually is divided into 2–3 spine covered branches; VIII apparently without caudolateral spur........... C. tuberosus sp. n. (Nearctic, Fig. 3 A–D)

- T II–V and S III–IV each with 2 short caudal tubercles, T VI with single tubercle; VIII with caudolateral spur. ..... 3

3. Segment VI with 4 subequal taeniate L-setae ......................................................................... C. nigronitens (Edwards)

- Segment VI with anterior 3 L-setae hair-like ................................................................................................................. ..................................... C. holsatus Lenz (Palaearctic, Lenz 1959 fig. 6–10, 12–13; 1954-62, fig. 260–268; Langton & Visser 2003 fig. 093)

4. T II without caudal hooklets; T II–VII or VIII and S II or III, VII or VIII with caudal spines; T VIII with 18–44, S VIII of male with 45–80 short caudal spines; usually 3 (occasionally 4) filamentous L-setae both on V and VIII ...... ........................................................................................ C. darbyi (Sublette) (Nearctic, Darby 1962 fig., Fig.6 A, B)

- T II at least with a few caudal hooklets and usually with caudal spines; T VIII and S VIII each with at most 10 short caudal spines; usually 4 filamentous L-setae both on V and VIII ................................................................................ 5

5. Taeniate L-setae on V–VIII as 2: 2: 3: 4, only about 13–14 taeniae in fringe of anal lobe........................................... ................................................................................................................................ C. usmaensis (Pagast) (Palaearctic)

- Taeniate L-setae on V–VIII as 4: 4: 4: 4, 17–40 taeniae in fringe of anal lobe ........................................................... 6

6. T II without caudal spines (only caudal hooklets) .......................................................................................................... ...................C. near usmaensis (Pagast) (Grosser Plöner See, Lenz 1959 figs 19–22, 1954–62: 211, Reiss 1964: 69).

- T II with caudal spines (and caudal hooklets) ............................................................................................................. 7

7. No extremely long branch of thoracic horn; no anal spur or comb; posterior spines of tergites and sternites not on conspicuous mounds; hook row on T II broad ( Reiss 1990: 209) ................................. C. acalcar Reiss (Palaearctic)

- One branch of thoracic horn extremely long; anal spur present; posterior spines on tergites and sternites on mounds, hook row on T II less than half as wide as segment ..................................................................................................... 8

8. T II–VII or VIII and S III–VII with well-developed caudal spines, pupa 5.0– 5.5 mm long ......................................... ............................................................................................................. C. pflugfelderi Reiss (Palaearctic, Reiss 1964).

- Usually only T II or III–VI and some of S II–VI with caudal spines, when spines indicated on T VII–VIII and S VI– VII pupa about 2.5–3.5 mm long ................................................................................................................................. 9

9. Anal lobe with 31–37 taeniae in fringe, apical ones not wider and darker than basal ones; T II with 25–37 caudal hooklets; S II –V or VI with caudal spines; pupa 3.1–4.1 mm long............................................................................... ................................................................................................ C. pseudotener (Goetghebuer) (Holarctic, Fig. 7 A–C).

- Anal lobe with 17–31 taeniae in fringe, apical ones wider and usually darker than basal ones; T II with 6–27 caudal hooklets, when more than 14 at most S II–IV with caudal spines and pupa 4.5–5.2 mm long .................................. 10

10. Only 6–14 caudal hooklets on T II, occasionally T VII–VIII and S VI–VII with caudal spines, apical taeniae of anal lobe darker than basal ones, main stem of thoracic horn 0.6–1.9 mm long, pupa 2.5–3.4 mm long ............................. ................................................................................................................ C. emorsus (Townes) (Nearctic, Fig. 4 A–C)

Figures

FIGURE 3. Cryptotendipes tuberosus sp. n., immatures. A – pupal tergites; B – pupal sternites; C – caudal tubercles of tergites; D – caudal tubercles of sternites E – larval antenna; F – labrum and epipharynx; G – mentum.

FIGURE 4. Cryptotendipes emorsus (Townes), immatures. A – pupal tergites; B – pupal sternites; C – whole pupa showing size of thoracic horn; D – antenna of larva; E – mentum.

FIGURE 6. Cryptotendipes darbyi (Sublette), immatures. A – pupal tergites; B – pupal sternites; C – larval antenna; D – larval mandible; E – maxilla and maxillary palp; F – mentum.

FIGURE 7. Cryptotendipes pseudotener (Goetghebuer), immatures. A – pupal tergites; B – pupal sternites; C – frontal apotome of pupa; D – larval antenna; E – mentum.