Monday, 15 November 2004

Euphoria redefined? A preliminary phylogeny of the Euphoriina (Scarabaeidae: Cetoniinae)

M. J. Paulsen,, University of Nebraska - Lincoln, University of Nebraska State Museum, Lincoln, NE

The primarily Nearctic flower scarab subtribe Euphoriina consists of approximately 50 species in three genera: Euphoria with ~45 species, Stephanucha with 5 species, and the monotypic Chlorixanthe. Generic placement within the Euphoriina is based on the presence or absence of clypeal teeth combined with a straight pronotal basal margin, i.e., species with both a dentate clypeus and a straight pronotal base are placed in Stephanucha. Species lacking either character fall into Euphoria. Thus, Euphoria contains some species possessing either a dentate clypeus or an entire pronotal base, and a morphological basis for the distinct genus Stephanucha seems lacking. If this is true, the genus Euphoria as currently characterized is paraphyletic. To evaluate this hypothesis, I sequenced two regions of 28S rDNA (D2 and its2) for nine spp. of Euphoria and three spp. of Stephanucha using Palearctic cetoniines in the genera Tropinota, Glycyphana, and Cetonia, etc. as outgroups. The resulting phylogeny demonstrates that the genus Euphoria is polyphyletic, with members of the genus Stephanucha arising as a clade from within Euphoria.

Species 1: Coleoptera Scarabaeidae Euphoria sepulcralis
Species 2: Coleoptera Scarabaeidae Euphoria inda (bumble flower beetle)
Species 3: Coleoptera Scarabaeidae Stephanucha pilipennis
Keywords: phylogeny, Euphoriina

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