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Type: Article
Published: 2009-03-27
Page range: 1–37
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Taxonomic revision of New World species of the genus Oosternum Sharp (Coleoptera: Hydrophilidae: Sphaeridiinae) I. Definition of species groups and revision of the Oosternum aequinoctiale group

Department of Entomology, National Museum, Kunratice 1, CZ-148 00 Praha 4, Czech Republic Department of Zoology, Faculty of Science, Charles University in Prague, Viničná 7, CZ – 128 44 Praha 2, Czech Republic
Johann Krümpel-Strasse, D-94447 Plattling, Germany
Department of Entomology, Zoological Museum, Universitetparken 15, DK-2100 Copenhagen Ø, Denmark
Coleoptera Hydrophilidae Sphaeridiinae Oosternum Neotropical Region Oriental Region Palearctic Region species groups new species taxonomy

Abstract

The genus Oosternum Sharp, 1882 is divided into ten species groups based on external adult characters. An identification key to the species groups and a table of diagnostic characters as well as many charater state illustrations for each group are provided. Representatives of the newly defined O. aequinoctiale species group are revised. Six species of this group are recognized, all occurring in the Neotropical region: Oosternum acutheca sp.n. (Honduras, Costa Rica, Nicaragua), O. aequinoctiale (Motschulsky, 1855) (Bolivia, Colombia, Costa Rica, Ecuador, Mexico, Panama, Peru, Venezuela), O. attenuatum sp. n. (Panama, Colombia, Ecuador), O. gibbicolle sp. n. (Ecuador, Panama), O. holosericeum sp. n. (Argentina), and O. latum sp. n. (Lesser Antilles: St. Vincent Island). A key to the species and drawings or SEM photographs of diagnostic characters are provided.

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