Phylogenetic analysis and reclassification of the genus Priochirus Sharp (Coleoptera : Staphylinidae : Osoriinae)
Jie Wu A B and Hong-Zhang Zhou A CA Institute of Zoology, Chinese Academy of Sciences, 25 Beisihuanxi Rd, Haidian, Beijing 100080, China.
B Graduate School of Chinese Academy of Sciences, 19 Yuquan Rd, Shijingshan, Beijing 100039, China.
C Corresponding author. Email: zhouhz@ioz.ac.cn
Invertebrate Systematics 21(1) 73-107 https://doi.org/10.1071/IS06010
Submitted: 3 April 2006 Accepted: 21 December 2006 Published: 8 March 2007
Abstract
The genus Priochirus Sharp (Coleoptera : Staphylinidae) is a rove beetle group with great variation in cephalic structures, especially the teeth on the frontal margin of head. In this paper, phylogenetic relationships among ten subgenera of the genus Priochirus sensu lato, and of Priochirus and other genera of the tribe Leptochirini are analysed. A cladistic analysis was conducted based on 62 characters of adult morphology. Results indicate that the genus Priochirus is not a monophyletic group and is divided into two lineages (called here Lineages I and II respectively). The subgenus Euleptarthrus Jakobson, which included three species-groups (japonicus, longicornis and malayanus), is shown to be polyphyletic. Lineage I corresponds with the Leiochirus + (Exochirus + Syncampsochirus) + (Eutriacanthus + (Plastus + (japonicus-group of Euleptarthrus + (Barychirus + Stigmatochirus)))) clade and forms a sister group to the genus Thoracochirus Bernhauer. Lineage II corresponds with the Priochirus, s. str. + (Cephalomerus + (longicornis- and malayanus-group of the Euleptarthrus)) clade. In addition, the analysis reveals sister relationships between representatives of Lineage I and the genus Thoracochirus. On the basis of phylogenetic inference, the genus Plastus Bernhauer, stat. nov. is proposed to include the subgenera of Lineage I and a new subgenus Sinumandibulus, subgen. nov., which is erected for the japonicus-group of the former subgenus Euleptarthrus. The genus Priochirus Sharp sensu novo is redefined to include the subgenera of Lineage II. Seven new species are described from China: Plastus (Sinumandibulus) curvaticornis, sp. nov. from Sichuan; Plastus (Sinumandibulus) recticornis, sp. nov. from Hubei; Priochirus (Euleptarthrus) amblyodontus, sp. nov. from Hunan; Priochirus (Euleptarthrus) baoxingensis, sp. nov. from Sichuan, Priochirus (Euleptarthrus) elongates, sp. nov. from Guizhou, Priochirus (Euleptarthrus) parvicornis, sp. nov. from Fujian and Priochirus (Euleptarthrus) oxygonus, sp. nov. from Hainan.
Acknowledgements
We are grateful to Mr Martin Brendell (BMNH), Dr Harald Schillhammer (NMW), Dr Shun-Ichiro Naomi (Natural History Museum and institute, Chiba, Japan), Dr Alfred Newton and Dr Alexey Solodovnikov (FMNH) for significant help in sending some type specimens for our study. Thanks are also due to Dr Yu-chi Zheng and Dr De-long Zhao (Institute of Zoology, CAS) for their help with computer analysis. We want to thank anonymous referees for many valuable suggestions to improve the manuscript. This study was supported by National Natural Science Foundation of China (NSFC-30570215 and 30670285), CAS Innovation Program (KSCX2-YW-Z-017), ‘National Science Fund for Fostering Talents in Basic Research’ (J0030092)’ and KFBG (Kadoorie Farm and Botanic Garden) Biodiversity Studentship of Hong Kong.
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