Data from: Katatopygia gen. n., a monophyletic branch segregated from Boletina (Diptera, Mycetophilidae)

The genus Katatopygia gen. n. is proposed for the Boletina erythropyga/punctus-group that was first introduced by Garrett (1924, 1925) and currently comprises eight described species. Molecular studies have strongly indicated that this group forms a monophyletic sister-group to a clade consisting of all other Boletina, Coelosia and Gnoriste, and its monophyly is supported by morphological data as well. The new genus includes the following species: Katatopygia antoma (Garrett, 1924), comb. n., Katatopygia antica (Garrett, 1924), comb. n., Katatopygia erythropyga (Holmgren, 1883), comb. n., Katatopygia hissarica (Zaitzev & Polevoi, 2002), comb. n., Katatopygia magna (Garrett, 1925), comb. n., Katatopygia laticauda (Saigusa, 1968), comb. n., Katatopygia neoerythropyga (Zaitzev & Polevoi, 2002), comb. n. andKatatopygia sahlbergi (Lundström, 1906), comb. n., all transferred from Boletina. Katatopygia sahlbergi is found to be a senior synonym of Boletina punctus Garrett, 1925, syn. n. A phylogeny based on morphological data and using parsimony analysis yielded four most parsimonious trees where the new genus is retrieved as monophyletic with high support. Katatopygia neoerythropyga is found to be the sister-taxon to all other species that form two clades, one with Katatopygia sahlbergi-like species and one with Katatopygia erythropyga-like species. A key to males of Katatopygia is provided.本文提议建立新属Katatopygia（genus novum, gen. n.），用以容纳Garrett于1924、1925年首次确立的Boletina erythropyga/punctus类群，该类群目前已正式描述8个物种。分子生物学研究已充分证实，该类群构成一单系姊妹群，其姊妹支系包含所有其余Boletina属物种、Coelosia属及Gnoriste属类群；同时该类群的单系性也得到形态学数据的支持。本新属包含以下均由Boletina属新组合（combinatio nova, comb. n.）而来的物种：Katatopygia antoma (Garrett, 1924), comb. n.、Katatopygia antica (Garrett, 1924), comb. n.、Katatopygia erythropyga (Holmgren, 1883), comb. n.、Katatopygia hissarica (Zaitzev & Polevoi, 2002), comb. n.、Katatopygia magna (Garrett, 1925), comb. n.、Katatopygia laticauda (Saigusa, 1968), comb. n.、Katatopygia neoerythropyga (Zaitzev & Polevoi, 2002), comb. n. 以及Katatopygia sahlbergi (Lundström, 1906), comb. n.。研究发现Katatopygia sahlbergi为Boletina punctus Garrett, 1925的首置异名（synonymia nova, syn. n.）。基于形态学数据并采用简约性分析构建的系统发育树共得到4棵最简约树，结果显示本新属为单系群且支持度较高。Katatopygia neoerythropyga为其余所有物种的姊妹群，其余物种可划分为两个支系：其一为类Katatopygia sahlbergi类群，其二为类Katatopygia erythropyga类群。本文同时提供了Katatopygia属雄虫的分类检索表。