Mitochondrial DNA Phylogeny and the Evolution of Host-Plant Use in Palearctic Chrysolina (Coleoptera, Chrysomelidae) Leaf Beetles |
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Authors: | Claudia F Garin Carlos Juan Eduard Petitpierre |
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Institution: | (1) Departament de Biologia, Universitat de les Illes Balears, Palma de Mallorca 07071, Spain, ES |
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Abstract: | The genus Chrysolina consists of specialized phytophagous leaf-beetles (Coleoptera, Chrysomelidae) with feed on several plant families. There
is no explicit phylogenetic hypothesis available for this genus, which includes 65 subgenera and more than 400 species with
a wide distribution. We obtained 839-bp sequence data from the 16S rDNA and cytochrome oxidase subunit I (COI) mitochondrial
genes. Thirty Chrysolina taxa representing eight host–plant affiliations, two species of the closely related genus Oreina, and two outgroups were sampled. These data sets were used separately and combined to obtain the mitochondrial cladogram of
the group using maximum-parsimony and maximum-likelihood criteria. The results were compared to current proposals for Chrysolina systematics that are based on morphological, ecological, and karyological data. The trees obtained were in the most part
congruent with the proposed ancestral association of Chrysolina to Lamiaceae based on chromosome number in several lineages. A minimum of five host-plant switches from the ancestral state
inferred at the family level and two at the subclass level suggests the absence of parallel evolution of beetles and their
host plants. Another switch leading to oligophagy at the family level was deduced to have occurred in the lineage of the subgenus
Chrysolina s.str.
Received: 22 May 1998 / Accepted: 16 September 1998 |
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Keywords: | : Coleoptera — Chrysomelidae — Phylogeny — Insect– plant interactions — mtDNA sequences — 16S rDNA — COI |
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