Procladius

Saether, Ole A., 2010, Procladius Skuse from Lake Winnipeg, Manitoba, Canada, with keys to some females and immature stages of the genus (Diptera: Chironomidae), Zootaxa 2726, pp. 34-58 : 55-56

Key to known Nearctic larvae of Procladius

1. Two small claws with broad bases and short distal ends, with or without teeth on inner margin, longest claws with pointed apices ( Fig. 14 I, J); hypopharyngeal pecten ( Fig. 13 K) with 6–9, usually 6 or 7, teeth; blade ( Fig.13 A) as long as segments 2 and 3 combined; lamellae of galea and chaetulae of palpifer ( Fig.14 A) broad and undivided; head capsule length 0.47–0.72 mm .................................................................................................... 2

- All claws with narrow bases, without teeth although small spines may be present on inner margins, long claws with attenuated whip-like apices ( Fig.14 K, L); hypopharyngeal pecten ( Fig. 13 L, M) with 10–14, usually 11–13, teeth; usually at least as long as segments 2–4 combined; at least some lamellae of galea and chaetulae of palpifer ( Fig.14 B, C) divided at apical half to third; head length more than 0.58 mm ..................................................................... 3

2. Two of the smaller posterior parapod claws sharply hooked, no claws with strong points on inner side.............................................................................................. P. (Psilotanypus) nietus Roback

- The smaller posterior parapod claws not sharply hooked, 0, 1, or 2 claws with strong points on inner side............................................................................................. P. (Psilotanypus) bellus Loew

3. Blade shorter than segments 2–4 combined ( Fig.13 B); two-segmented sensilla basiconica (SBP in Fig. 14 E) of maxillary palp shorter than bisensillum (Bs in Fig.14 E), its basal segment shorter than its apical segment; head capsule length 0.62–0.78.................................................................................... P. (H.) freemani Sublette

- Blade at least as long as segments 2–4 combined or usually longer ( Fig. 13 C–E); SBP ( Fig. 14 F–H) of maxillary palp longer than Bs, its basal segment longer than its apical segment; head capsule length 0.65–1.05 mm .......................... 4

4. Blade at least as long as segments 2–4 combined, accessory blade usually nearly as long as blade ( Fig. 13 C); head capsule length 0.58–0.81 mm ................................................................................... 5

- Blade as long as segments 2–4 combined or, if as long as segments 2–5 combined, head capsule length over 0.92 mm; accessory blade distinctly shorter than blade ( Fig. 13 D, E)........................................................................................................ 6

5. Sclerotized part of basal segment of maxillary palp ( Fig. 14 F) 1.9–2.6 times as long as wide....... P. (H.) culiciformis (L.)

- Sclerotized part of basal segment of maxillary palp about 3.2 times as long as wide................ P. (H.) wilhmi Roback

6. Procercus with 18–19 setae; both mandible and basal antennal segment longer than 210 µm............ P. (H.) ruris Roback

- Procercus with 9–14 setae; mandible and basal antennal segment often shorter than 210 µm.......................... 7

7. Sclerotized part of basal segment of maxillary palp ( Fig. 14 E) 45–58 µm long and 2.4–2.9, mean 2.5, times as long as wide; basal antennal segment 4.5–5.6, 5.0 times as long as wide and 3.4–4.5, mean 4.0, times as long as basal palpal segment; head capsule length 0.72–0.91 mm ......................................................... P. (H.) sublettei Roback

- Sclerotized part of basal segment of maxillary palp ( Fig. 14 G) 55–74 µm long and 2.7–3.5, mean 3.0, times as long as wide; basal antennal segment 5.1–6.4, mean 5.5 times as long as wide and 2.9–3.9, mean 3.4, times as long as basal palpal segment; head capsule length 0.79–1.05 mm long.............................................. P. (H.) denticulatus Sublette

Figures

FIGURE 13. Procladius spp., larvae, antennal apex (A – E), antenna (F – G), labrum (H – J), and ligula, paraligula and hypopharyngeal pecten. A, F, H, K— Procladius (P.) bellus (Loew); B, I, L— Procladius (H.) freemani Sublette; C— Procladius (H.) culiciformis (L.); D— Procladius (H.) denticulatus Sublette; E, G, J, M— Procladius (H.) sublettei Roback.

FIGURE 14. Procladius spp., larvae; maxillae ventral view (A – B), dorsal view (C); maxillary palp (D – H), claws of posterior parapods (I – L). A, D, I, J— Procladius (P.) bellus (Loew); B, F, K— Procladius (H.) culiciformis; C, G, L— Procladius (H.) denticulatus Sublette; E— Procladius (H.) freemani Sublette; H— Procladius (H.) sublettei Roback.