Abstract
The species of the genus Oreoderus are morphologically similar, and can be challenging to distinguish without dissecting the male genitalia. In this study, the Oreoderus species from China are reviewed. Three new species of Oreoderus are described: Oreoderus dasystibialis Li & Yang, sp. n., Oreoderus brevitarsus Li & Yang, sp. n. and Oreoderus oblongus Li & Yang, sp. n. A key of the male Oreoderus and a distribution map are provided. Oreoderus coomani Paulian, 1961 was found as a new record in China. The first description of the female of Oreoderus arrowi Ricchiardi, 2001 is provided. Oreoderus humeralis Gestro, 1891, Oreoderus quadricarinatus Arrow, 1944, Oreoderus crassipes Arrow, 1944, and Oreoderus momeitensis Arrow, 1910 are excluded from the Chinese fauna. Furthermore, we utilize geometric morphometric approaches (GM) to analyze the shape variation of four characters (pronotum, elytra, protibia and aedeagus) in Oreoderus. The morphological variations of Oreoderus and the taxonomic value of each character are discussed. The combined analysis of geometric morphometrics and comparative morphology support recognition of the three new species.
Highlights
Oreoderus Burmeister, 1842 is a genus of Valgini (Coleoptera: Scarabaeidae) which comprises 29 species, distributed only in the Oriental Region
Based on our examination of specimens deposited in IZAS, we identified O. humeralis Gestro, 1891 sensu Ma (1993) as O. maculipennis Gestro, 1891; O
According the canonical variate analysis (CVA) analyses above, the studied specimens were clustered into seven groups for all four morphological characters
Summary
Oreoderus Burmeister, 1842 is a genus of Valgini (Coleoptera: Scarabaeidae) which comprises 29 species, distributed only in the Oriental Region. Adults are flower-visitors, the larvae develop in the rotten wood (with or without termites) (Krikken 1984). This genus can be separated from most of the other Valgini (5-7 teeth on the protibia) by two character states: two or three external teeth on the protibia and the relatively shorter first joint of the hind tarsus compared to the second one. Some minor differences are observed in external characters (e.g., protibia, pronotum, elytra, etc.) as reported by Ricchiardi (2001), but these characters have not been systematically studied Many of these characters vary in their shape, which is not described and compared by traditional morphological approaches
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