The study of Collembola communities from the protected areas Codrul Secular Giumalău and Peştera Liliecilor in the Eastern Carpathians in Romania revealed 69 collembolan species belonging to 44 genera. In Codrul Secular Giumalău 57 species were identified. Of these, five are new for the fauna of Romania and one species, Hymenaphorura ioni sp. nov., is new for science and its description is presented. In the natural reserve Peştera Liliecilor 25 species of Collembola were identified, being the first data concerning the group in this area.

The taxonomy and morphology of species related to the genus Andotypus Spangler, 1979 (Coleoptera: Hydrophiloidea: Hydrophilidae: Rygmodinae) are reviewed in detail. Austrotypus gen. nov. is established for A. nothofagi sp. nov. (eastern Australia) and A. peruanus sp. nov. (Peru), both of which share the same morphology of the mouthparts and mesoventrite. The genus Andotypus is found to be endemic to central and sourthern Chile, containing two species: A. ashworthi Spangler, 1979 and A. araucariae sp. nov. Andotypus perezdearcei Moroni, 2000 is found to belong to the genus Dactylosternum Wollaston, 1854 (Hydrophilidae: Sphaeridiinae: Coelostomatini), and is a junior subjective synonym of the introduced species D. abdominale (Fabricius, 1792). Adults of all species of Andotypus and Austrotypus are (re)described in detail and important characters are illustrated. Larval morphology and head chaetotaxy is described and illustrated in detail for Andotypus ashworthi and Austrotypus nothofagi, revealing differences in head morphology and abdominal tergites which support the separate status of both genera. The taxonomic position of the genera within the Rygmodinae is briefly discussed, but should be corroborated by formal phylogenetic analysis. We hypothesize that the austral disjunct distribution of Austrotypus as well as current distribution of Andotypus are results of the break-up of Gondwana combined with changes of climate in austral South America, Antarctica and Australia during the Cenozoic. Andotypus and Austrotypus represent an independently evolved lineage of dung- and carrion-associated beetles native to the southern temperate zone, and the fact that their larvae largely resemble those of Sphaeridium Fabricius, 1775 suggests that they may represent a partial ecological analogue of the Old World medium-sized coprophilous hydrophilids of the tribe Sphaeridiini. The syntopical co-occurrence of Austrotypus nothofagi with four similarly colored scarabaeoid dung-inhabiting beetles (Onthophagus sydneyensis Blackburn, 1903, O. arrilla Matthews, 1972, Lepanus ustulatus (Lansberge, 1874) and Liparochrus nanus Paulian, 1980) suggests that Austrotypus nothofagi may be a member of a mimetic complex formed by these species.

Ectateus vinolasi sp. nov. and Quadrideres blaszaki sp. nov., two new Afrotropical Platynotina species are described and illustrated. The distribution map is presented.

The redescriptions of Hyalarthrodosis monodi (Pierre, 1974) and Hyalerodius jirofti Kaszab, 1979, species hitherto known from single and damaged specimens, are supplemented based on the newly accessed material. The structure of male genitalia of these taxa is described for the first time. The key to the Asian genera of the Arthrodosis-like Erodiini is modified to include new diagnostic characters. New distributional records for the studied species are provided. The evolutionary adaptations to the ultrapsammophilous lifestyle within Tenebrionidae are discussed.

The genus Cryptolaemus Mulsant endemic to New Guinea / Australasia is reviewed. Thirty-two new species (C. tetrahedron, C. simulatus, C. sigmoidus, C. distinctus, C. pulchellus, C. dualis, C. ambiguus, C. sedlaceki, C. iodes, C. purpureus, C. parvus, C. prominens, C. metallicus, C. magnificus, C. splendidus, C. regalis, C. splendens, C. riedeli, C. dubius, C. trochanteratus, C. similis, C. aeruginosus, C. bicolor, C. asymmetricus, C. incertus, C. typicus, C. incrassatus, C. robustus, C. fraternus, C. atratus, C. guineensis, C. gressitti, spp. nov.) are described and illustrated. Cryptolaemus concinnus Weise is redescribed and the male genitalia are illustrated. Besides montrouzieri-group and subviolaceus-group, four more species groups are tentatively recognized based on male genitalia and other characters: iodes-group, magnificus-group, riedeli-group, and bicolor-group, and some of the species are unassociated with any of these groups. A key is provided to the males of the species of Cryptolaemus from New Guinea, mainly based on genitalia. Presence of a stridulatory apparatus is reported from species of the riedeli-group, which is the first of its kind in Coccinellidae.

Themus (T.) senensis (Pic, 1922) is redescribed and three new species related to it are described, T. (T.) senensomimus sp. nov. (China, Thailand), T. (T.) bilobatus sp. nov. (Laos, Vietnam) and T. (T.) dalatensis sp. nov. (Vietnam). Each species is provided with illustrations of aedeagus and abdominal sternite VIII of female. T. (T.) senensis is also presented with female genitalia and the new species with habitus of both sexes. A key and a distribution map of the above four species are presented.

Two enigmatic genera of Trogossitidae are described and illustrated from well-preserved impression fossils from the Middle Jurassic Jiulongshan Formation collected at Daohugou Village, Shantou Township, Ningcheng County, Inner Mongolia, China. Both new genera, Marginulatus gen. nov. (type species M. venustus sp. nov.) and Latitergum gen. nov. (type species L. glabrum sp. nov.) are placed in Trogossitidae incertae sedis because they have a mixture of characters that do not allow for them to be easily placed in the current classification of Trogossitidae.

Mirax caspiana sp. nov. from Iran is described and illustrated. The new species is characterized by having the second metasomal tergite aciculate, the width of face 1.2 times longer than height of face and clypeus combined, the penultimate flagellomere twice as long as wide and the malar space as long as basal width of mandible. A key to the species of the genus Mirax Haliday in the West Palaearctic Region is provided.

Illustrated descriptions are given for three new North European species of the genera Aspilota and Synaldis: Aspilota spiracula sp. nov. from Denmark, Synaldis agaricae sp. nov. from Denmark, Finland and the Netherlands, and Synaldis machairum sp. nov. from Denmark.

The planthopper genus Montrouzierana Signoret, 1861 (Hemiptera: Fulgoromorpha: Tropiduchidae) and its only known endemic species to New Caledonia, M. oxycephala (Montrouzier, 1861), are redescribed. Illustrations of diagnostic characters including male and female genitalia are provided. The systematic position of the genus is briefly discussed. Morphological characters and distribution data suggest a recent dispersal event to New Caledonia, probably from Australia, linked with a possible relaxation/inhibition of ancestral constraints on feeding behaviour.