White grubs (Coleoptera, Melolonthidae) in the "Planalto Region", Rio Grande do Sul state, Brazil: Key for identification, species richness and distribution

White grubs (Coleoptera, Melolonthidae) in the "Planalto Region". Rio Grande do Sul state, Brazil: Key for identification, species richness and distribution. The objective of this study was to survey the occurrence and geographic distribution of white grub species (Coleoptera. Melolonthida...

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Bibliographic Details
Published in:Revista Brasileira de Entomologia 2013-09, Vol.57 (3), p.271-278
Main Authors: Cherman, Mariana A., Guedes, Jerson V. C., Morón, Miguel A., Prá, Elder Dal, Bigolin, Maurício
Format: Article
Language:English
Subjects:
Coleoptera
Diloboderus abderus
Dynastinae
ENTOMOLOGY
grain crops
Insecta
Melolonthidae
Melolonthinae
rhizophagous larvae
Rutelinae
species assemblages
taxonomy
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Summary:White grubs (Coleoptera, Melolonthidae) in the "Planalto Region". Rio Grande do Sul state, Brazil: Key for identification, species richness and distribution. The objective of this study was to survey the occurrence and geographic distribution of white grub species (Coleoptera. Melolonthidae) in cultivated and non-cultivated fields of the "Planalto Region", Rio Grande do Sul state, Brazil and develop a key at genus-level. Twenty-eight species from 15 genera and three subfamilies were recorded: Dynastinae, Melolonthinae and Rutelinae. The species or genera recorded for the first time in the state are: Cyclocephala metrica, C. tucumana, Isonychus albicinctus, Liogenys bidenticeps, L. fusca, L. obesa and L. sinuaticeps, Paranomula violacea, as well as unidentified species of Amononyx, Dicrania, Leucothyreus, Macrodactylus, Plectris and Rhizogeniates. Among the species recorded, 23 were associated with winter crops. Only Cyclocephala metrica, Dyscinetus rugifrons, two species of Leucothyreus and one species of the tribe Sericini were not present in cultivated crop fields. Cyclocephala flavipennis and Diloboderus abderus occurred in most of the municipalities sampled, often associated with Plectris sp., C. modesta and C. putrida. The highest richness of melolonthids was concentrated in the northeast of the Planalto region.
ISSN:0085-5626
1806-9665
DOI:10.1590/S0085-56262013000300005