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Open Access Research article

New fossil species of ommatids (Coleoptera: Archostemata) from the Middle Mesozoic of China illuminating the phylogeny of Ommatidae

Jingjing Tan12, Yongjie Wang2, Dong Ren2* and Xingke Yang1*

Author Affiliations

1 Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Box 92, No. 1, Beichen West Road, Chaoyang District, Beijing 100101, People’s Republic of China

2 College of Life Sciences, Capital Normal University, Beijing 100048, People’s Republic of China

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BMC Evolutionary Biology 2012, 12:113  doi:10.1186/1471-2148-12-113

Published: 9 July 2012

Abstract

Background

Ommatidae is arguably the “most ancestral” extant beetle family. Recent species of this group are only found in South America and Australia, but the fossil record reveals a much broader geographical distribution in the Mesozoic. Up to now, thirteen fossil genera with more than 100 species of ommatids have been described. However, the systematic relationships of the extant and extinct Ommatidae have remained obscure. Three constraint topologies were designed based on Kirejtshuk’s hypothesis, enforced the monophyly of Tetraphalerus + Odontomma, Pareuryomma + Notocupes and both respectively.

Results

In this study, four new species, Pareuryomma ancistrodonta sp. nov., Pareuryomma cardiobasis sp. nov., Omma delicata sp. nov., and Tetraphalerus decorosus sp. nov., are described. Based on well-preserved fossil specimens and previously published data the phylogenetic relationships of extant and extinct lineages of Ommatidae were analyzed for the first time cladistically. Based on the results we propose a new classification with six tribes of Ommatidae: Pronotocupedini, Notocupedini, Lithocupedini, Brochocoleini, Ommatini and Tetraphalerini. These taxa replace the traditional four subfamilies.

Conclusion

There is good support for the monophyly of the ingroup. Notocupedini, as defined by Ponomarenko, are paraphyletic. Notocupoides + Eurydictyon are the sister group of the remaining fossil and extant ommatids. Together they form the clade Pronotocupedini. Notocupedini and Lithocupedini are the next two branches. The tribe Brochocoleini is the sister group of a clade comprising Tetraphalerini and Ommatini.

Keywords:
Ommatidae; Omma; Tetraphalerus; New species; Mesozoic; China