Polypedilum sordens
(van der Wulp, 1874)
Polypedilum sordens is a non-biting midge in the Chironomidae, originally described by van der Wulp in 1874 as Tanytarsus sordens. It belongs to the subgenus Pentapedilum and is the namesake of the 'sordens group,' a monophyletic clade of 13 species distributed across Asia, the Indo-Pacific, and Africa. The species has documented presence in Scandinavia (Denmark, Norway, Sweden).
Pronunciation
How to pronounce Polypedilum sordens: //ˌpɒlɪˈpɛdɪləm ˈsɔːrdɛns//
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Identification
As a member of the subgenus Pentapedilum, P. sordens shares diagnostic morphological characters with other in this subgenus across all life stages (, larva, pupa, male and female). Specific distinguishing features from require examination of detailed morphological keys provided in taxonomic revisions of Pentapedilum.
Distribution
Documented present in Denmark, Norway, and Sweden. As part of the sordens group, related occur across Asia, the Indo-Pacific, and Africa, suggesting broader potential range, though specific distribution records for P. sordens itself outside Scandinavia are not confirmed in available sources.
Life Cycle
As a , development includes , larval, pupal, and stages. The subgenus Pentapedilum has diagnostic characters described for all stages and sexes, though specific timing for P. sordens is not documented.
Similar Taxa
- Polypedilum parasordensTransferred from Pentapedilum to Polypedilum s. str. in taxonomic revision; distinct subgeneric placement separates it from P. sordens despite similar name.
- Other sordens group speciesThirteen in the sordens group share phylogenetic affinity and geographic distribution across Asia, Indo-Pacific, and Africa; morphological keys are required for species-level identification.
More Details
Taxonomic History
Originally described as Tanytarsus sordens by van der Wulp in 1874. The subgenus Pentapedilum, to which P. sordens belongs, has been subject to extensive revision, with multiple transferred between subgenera and based on phylogenetic analysis.
Phylogenetic Context
The sordens group represents one of three clades within Pentapedilum, alongside the convexum group and uncinatum group. Phylogenetic analysis indicates Pentapedilum is likely monophyletic, while Polypedilum s. str. is polyphyletic. Distribution patterns across the sordens group suggest rather than vicariance as the primary biogeographic mechanism.