Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 98. (Budapest 2006)

Kirejtshuk, A. G.: New species of the genus Physoronia from the Far East and Kryzhanovskiella gen. n. from Australia, with taxonomic notes on the Pocadius complex (Coleoptera: Nitidulidae)

NOTES ON PLACEMENT OF OMOSITOIDEA SCHAUFUSS, 1892 This genus can be regarded as a member of the Pocadius complex rather than any other of the complexes of the tribe Nitidulini, because it has the more or less distinctive shape of antennái club and a rather deeply excavate mesosternum. For example, the asymmetry of the antennái club of Omositoidea gigantea and Physoronia taiwanensis sp. n. is rather similar. Nevertheless, the placement of this taxon in this complex will be discussed in detail in a paper devoted to Nitidulidae from Dominican and Baltic amber (KlREJTSHUK & PoiNAR, in preparation). It is characterised by the comparatively large and very convex body, widely rounded anterior and posterior angles of pronotal, unique type of dorsal pubescence, very long cilia along pronotal and elytral sides, long and dense pubescence on legs, comparatively narrowly separated coxae in all pairs, peculiar sexual dimorphism in the shape of mesotibia and rather reduced puncturation. All of these characters clearly separate this taxon from other members of the complex. Omositoidea gigantea exhibits some similarity with species of the genus Amphicrossus ERICHSON, 1843 (Amphicrossinae). However, it can scarcely be regarded as a relative of this group, since the male hypopygidium is not excised medially at the apex and has no trace of a movable apical lobe, and also its mesosternum has no structures typical of Amphicrossus (such as a median plate and V-shaped sulci in the anterior half of the mesosternum, characteristic only of Amphicrossinae). The tibial spurs are rather short or reduced not only in Omositoidea gigantea, but also not infrequently among members of the Pocadius complex (Atarphia, Hyleopocadius, Physoronia, Pocadites). * Acknowledgements - The author visited Budapest in the Programme of Equivalent Exchange between Russian and Hungarian Academies and the Programme of the Presidium of the Russian Academy of Sciences "Origin and evolution of the biosphere", and studied the collection of the Hungarian Natural History Museum, which was necessary for some important research on Nitidulidae deposited there. O. MERKL and his team provided him with all facilities for working in the museum and for preparing the manuscript of this paper. It is the author's agreeable duty to express his thanks to M. BRANCUCCI and E. SPRECHER (Naturhistorisches Museum in Basel) for the loan of new species of Physoronia as well as to W. WEITSCHAT (Geologisch-Paläontologisches Institute und Museum, Universität Hamburg) for his assistance in finding and studying the type Omositoidea gigantea. The author is extremely grateful to M. V. L. BARCLAY (Natural History Museum in London) for checking the English text.