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1 March 2007 Phylogeny and Genital Evolution of Carabid Beetles in the Genus Pterostichus and Its Allied Genera (Coleoptera: Carabidae) Inferred from Two Nuclear Gene Sequences
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Abstract

The phylogeny and genital evolution of carabid beetles in the tribe Pterostichini, mainly the genus Pterostichus (Coleoptera: Carabidae), were studied using two nuclear gene sequences: wingless and 28SrDNA. Phylogenetic results suggest that the genera Molops, Poecilus, Stomis, Myas, Lesticus, and Trigonotoma and the subgenus Bothriopterus of the genus Pterostichus form basal lineages, with genus Molops sister to the rest of the tribe. The genus Pterostichus, with the exception of the subgenus Bothriopterus, was monophyletic and occupied more derived lineages. Examinations of the membranous parts of the genitalia (male endophallus and female spermatheca) revealed that endophalli and spermathecae are classified into four and five types, respectively. Reconstructions of genital character evolution on the trees obtained suggest that the ancestor of Pterostichini had a straight endophallus and a short cylindrical spermatheca and that the elaborated genitalia seen in some species evolved in more derived lineages.

Kôji Sasakawa and Kôhei Kubota "Phylogeny and Genital Evolution of Carabid Beetles in the Genus Pterostichus and Its Allied Genera (Coleoptera: Carabidae) Inferred from Two Nuclear Gene Sequences," Annals of the Entomological Society of America 100(2), 100-109, (1 March 2007). https://doi.org/10.1603/0013-8746(2007)100[100:PAGEOC]2.0.CO;2
Received: 8 December 2005; Accepted: 1 August 2006; Published: 1 March 2007
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