Journal of Zoological Systematics and Evolutionary Research (2006) 44, 63-74

N. Alvarez, J. RomeroNapoles, K.-W. Anton, B. Benrey and M. Hossaert-McKey (2006)
Phylogenetic relationships in the Neotropical bruchid genus Acanthoscelides (Bruchinae, Bruchidae, Coleoptera)
Journal of Zoological Systematics and Evolutionary Research 44 (1), 63-74
Abstract: Adaptation to host-plant defences through key innovations is a driving force of evolution in phytophagous insects. Species of the neotropical bruchid genus Acanthoscelides Schilsky are known to be associated with specific host plants. The speciation processes involved in such specialization pattern that have produced these specific associations may reflect radiations linked to particular kinds of host plants. By studying host-plant associations in closely related bruchid species, we have shown that adaptation to a particular host-plant (e.g. with a certain type of secondary compounds) could generally lead to a radiation of bruchid species at the level of terminal branches. However, in some cases of recent host shifts, there is no congruence between genetic proximity of bruchid species, and taxonomic similarity of host plants. At deeper branches in the phylogeny, vicariance or long-distance colonization events seem to be responsible for genetic divergence between well-marked clades rather than adaptation to host plants. Our study also suggests that the few species of Acanthoscelides described from the Old World, as well as Neotropical species feeding on Mimosoideae, are misclassified, and are more closely related to the sister genus Bruchidius.
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Link to article at publishers website
Database assignments for author(s): Betty Benrey

Research topic(s) for pests/diseases/weeds:
identification/taxonomy
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Acanthoscelides obtectus		Mexico
	Acanthoscelides obvelatus		Mexico