Procladius Skuse,

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: 36

publication ID 10.5281/zenodo.200030

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Procladius Skuse


Procladius Skuse 

Seven species of Procladius  were found in the light traps from Lake Winnipeg. Of these, however, two species were never caught with certainty in the bottom samples. The other five belonged to the most common species of the benthos ( Fig. 1View FIGURE 1).

Adults of all five common species were caught from the beginning of June to the middle of September ( Figs. 3View FIGURE 3, 5View FIGURE 5, 7View FIGURE 7, 9View FIGURE 9, 11View FIGURE 11). Pupae or first and second instars of P. culiciformis  were present from early June to early October ( Fig. 5View FIGURE 5), in early June to early September for P. freemani  ( Fig. 9View FIGURE 9), from early June to end of August for P. denticulatus  ( Fig. 7View FIGURE 7), in June and July for P. sublettei  ( Fig. 11View FIGURE 11), and in July for P. bellus  ( Fig. 3View FIGURE 3).

The individual species within the genus Procladius  are among the most difficult to determine within the Tanypodinae  both as imagines and as immatures. Kobayashi (1998) showed that body size and male genital structures varied seasonally in Procladius choreus (Meigen)  . The smallest imagines, which were observed in summer, were reduced to about 60 % of the largest ones in wing length, while the gonostylus had a longer posterior heel in spring and fall. Since the length and shape of the gonostylus heel is used as one of the important genital characters in discriminating species of Procladius  the separation of several species becomes doubtful. About 20 species of Procladius  are known from the Nearctic region and more than 60 from the Palaearctic region many of them likely synonyms. The genus is in urgent need of taxonomic revision especially of species outside the Nearctic region.