On the genus Polypedilum, subgenus Collartomyia, with description of P. (Col.) baishanzuensis sp. nov. from Baishanzu Nature Reserve, China (Diptera, Chironomidae).

Chao Song,Wei Liu,Xin Qi,Binqing Zhu

doi:10.3897/zookeys.1065.69870

Abstract

A new species of the genus Polypedilum Kieffer, 1912 is described from Baishanzu Nature Reserve, China, based on molecular and morphological data. Molecular phylogenetic analysis based on standard barcode sequences confirmed a new clade of Polypedilum (Collartomyia) species. The new species is easily distinguished from its congeners by a combination of the following morphological characters: membrane of wing with a large spot occupying 70% of the proximal area; tergite without dark brown band pigmentation; tarsi I–V dark brown; superior volsella with three outer lateral setae and six long setae along inner base; inferior volsella with setose tubercules. An updated key to adult males of the subgenus Collartomyia is also provided.

Highlights

Polypedilum Kieffer, 1912 is the largest chironomid genus, with more than 520 known species worldwide
The subgenus Collartomyia was recently recognized by Tang et al (2021) for the species having wing with a brownish band or dark spots, a well-developed gonocite bulb, split setae usually present on inner margin of gonostylus, including the previous subgenus Cerobregma Sæther & Sundal, 1998 and the monotypic genus Yaethauma Yamamoto, Yamamoto & Tang, 2018
Molecular data and morphological comparisons supported it as an undescribed taxon that we describe as a new species

Summary

Introduction

Polypedilum Kieffer, 1912 is the largest chironomid genus, with more than 520 known species worldwide. The subgenus Collartomyia was recently recognized by Tang et al (2021) for the species having wing with a brownish band or dark spots, a well-developed gonocite bulb, split setae usually present on inner margin of gonostylus, including the previous subgenus Cerobregma Sæther & Sundal, 1998 and the monotypic genus Yaethauma Yamamoto, Yamamoto & Tang, 2018. The subgenus includes 21 valid species recorded in the Afrotropical, Holarctic, and Oriental regions (Sæther and Sundal 1999; Kobayashi et al 2003; Zhang and Wang 2005; Zhang et al 2006; Moubayed-Breil 2007; Tang and Niitsuma 2017; Yamamoto et al 2018; Lin et al 2019; Qi et al 2020; Liu et al 2021). Barcode sequences are becoming a necessary character for chironomid species identification and new species descriptions (Song et al 2016, 2018; Lin et al 2018, 2020; Makarchenko et al 2020; Qi et al 2020)

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