Immature stages of the genus Oxythyrea (Coleoptera: Scarabaeidae: Cetoniinae) with a key to third instar larvae, and notes on the biology of the genus Author Vondráček, Dominik Author Hadjiconstantis, Michael Author Šípek, Petr text Zootaxa 2018 2018-10-01 4486 4 401 434 journal article 29367 10.11646/zootaxa.4486.4.1 de2f897b-3d16-4bcd-99a7-fb46a61b5bd1 1175-5326 1442168 7652EE8A-437B-4A61-ACF6-4A3BF6553808 Key to the larval instars of Cetoniinae Note: We provided this key to be sure, that readers of this work will be able to distinguish third instar larvae (L3) of Cetoniinae from other instars (L1, L2), because L3 of smaller species (e.g. Oxythyrea ) can be the same size as L1 and L2 of some bigger species (e.g. Protaetia sp. Burmeister, 1842). Almost all descriptions of Scarabaeidae larvae are based on the third instar larva, but some of key morphological structures (e.g. raster) are not fully developed only in early instars (e.g. Šípek et al. 2012b ). Therefore, the correct identification of larval instar is necessary. The characteristic given here are mostly based on unpublished material collected by the authors (pers. observation), as published data on the early stages larvae (L1, L2) of the Cetoniinae is missing ( Šípek et al. 2012b ). 1 Respiratory plate of (thoracic) spiracle oval or round, bullar opening narrow and tiny, respiratory plate covering almost entire area of the spiracle ( Fig. 13 A )................................................................ first instar larva - Thoracic spiracle with well-defined c-shaped respiratory plate and well-developed bulla............................. 2 2 Thoracic spiracle with bulla without ecdysial scar ( Fig. 13B ), if ecdysial scar present ( Fig. 13C ) then pali slender, distinctly shorter and less sclerotized when compared to tegillar setae ( Fig. 13I ; compare with Fig. 13J ). Not aplicable for species without distinctly developed raster (rows of pali), i. e. in Europe for larvae of the genus Osmoderma LePeletier & Audinet-Serville, 1828 ..................................................................................... 2nd instar larva - Thoracic spiracle with well-developed bulla and well-developed ecdysial scar ( Fig. 13C ), pali of raster normally developed ( Fig. 13J )................................................................................third instar larva