Eur. J. Entomol. 103 (2): 459-467, 2006 | DOI: 10.14411/eje.2006.059
Phylogeny of Chrysotoxum species (Diptera: Syrphidae) inferred from morphological and molecular characters
- 1 Dipartimento di Scienze e Tecnologie Agroambientali - Entomologia, Alma Mater Studiorum - UniversitL di Bologna, viale G. Fanin 42, 40127 Bologna, Italy
- 2 Dipartimento di Biologia Evoluzionistica Sperimentale, Alma Mater Studiorum - UniversitL di Bologna, via Selmi 3, 40126 Bologna, Italy
- 3 Biostudio, via Riello 4, 36010 Velo d'Astico, Vicenza, Italy
Relationships of nine Italian Chrysotoxum species were analysed using morphological and molecular data. The morphology-derived cladogram revealed three well-defined groups: (i) C. cautum, (ii) the arcuatum group (C. arcuatum, C. fasciolatum) and (iii) the festivum group (C. festivum - C. vernale, C. bicinctum, C. elegans, C. octomaculatum and C. parmense). Trees inferred from COI-tRNALeu-COII sequences were largely in agreement, but they identified (i) C. parmense as an isolated branch, (ii) C. festivum and C. vernale as separate entities, (iii) C. elegans within a paraphyletic C. festivum clade. ITS2 trees were partially unresolved but C. parmense sequence emerged as a sister to the festivum group. The monophyly of the festivum group derived from morphological data was rejected by a phylogenetic test performed on combined molecular data set. The diagnostic value of some morphological characters commonly used to identify Chrysotoxum species is therefore questioned.
Keywords: Chrysotoxum, cytochrome oxidase I, cytochrome oxidase II, molecular phylogeny, morphology, tRNALeu
Received: May 31, 2005; Revised: September 9, 2005; Accepted: September 9, 2005; Published: April 6, 2006 Show citation
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