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RESEARCH ARTICLE
Contents Vol 19(3)

Diversification of the endemic Himalayan monsoon-season beetle genus Calloserica inferred from a cladistic analysis (Coleoptera : Scarabaeidae : Sericini)

Dirk Ahrens
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Deutsches Entomologisches Institut im ZALF, Eberswalder Str. 84, D-15374 Müncheberg, Germany. Email: ahrens.dirk_col@gmx.de

Invertebrate Systematics 19(3) 217-230 https://doi.org/10.1071/IS04030
Submitted: 30 September 2004  Accepted: 3 May 2005   Published: 15 July 2005

Abstract

A cladistic analysis of the species of Calloserica Brenske, 1894, was executed using 49 morphological characters of adults. The generated phylogenetic tree supports the monophyly of the genus and the sister-group relationship between Pachyserica and (Gastroserica, Neoserica). Allopatric speciation is discussed as an important mechanism for explaining present tree topology and distribution patterns. Emergence of adults (and mating) during the monsoon season is considered to be a major factor for stimulating the diversification of this group, resulting in its highly restricted distribution and a high degree of endemism. Two new species are described from Nepal: Calloserica capillata, sp. nov. and C. manangensis, sp. nov.


Acknowledgments

Several people have generously given time, advice, encouragement and valuable information in the course of this research. I am particularly grateful to: Walter Sudhaus (Free University Berlin) for helpful discussions; Holger Dathe (DEI) for providing me with comfortable working facilities at the German Entomological Institute in the course of the graduate training programme; and O. Merkl (HNHM), R. Poggi (MSNG), O. Montreuil, N. Berti, Y. Cambefort (MNHN), M. Brancucci, E. Sprecher-Uebersax, D. Burckhardt (NHMB), M. Brendell (BMNH), W. Schawaller (SMNS), O. Jäger (SMTD), H. Howden (Ottawa) and P. Pacholátko (Brno) for the loan of the studied material. Paul Lago (Mississippi) and Walter Sudhaus are thanked for reviewing the manuscript. This project was supported by a DFG grant (GRK 503/2) to the author.


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