Abstract
We examine host association patterns in pteridophagous moths of the tribe Lithinini (Lepidoptera: Geometridae). This represents the first study where the host associations of oligophagous, pteridophagous Lepidoptera are analysed in a phylogenetic context. We compare the observed phylogenetic patterns of lithinine moths and their hosts with the contrasting coevolutionary scenarios proposed by Mitter et ai, and discuss the support for various hypotheses relative to Thompson's concept of coevolution as ‘escape with radiation’, and the chemical facilitation model of Jermy. The patterns observed support a scenario where host shifting subsequent to a single colonization event has resulted in lack of strict concordance (i.e. parallel cladogenesis) between moth and fern phylogenies.
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