An updated classification of the order Hymenoptera is provided with the current numbers of genera and species described so far specified. The order is composed of 2 suborders, 27 superfamilies, 132 families, 8423 extant genera with an additional 685 extinct genera. Considered one of the most species-rich insects orders a total of 153088 extant species have been described, in addition to 2429 extinct species.

The results of the first phylogenetic investigation of members of the Aulacidae of the world are presented. The main objective was to test the monophyly of the currently recognised genera. In total, 79 morphological characters were scored for a substantial sample of the extant aulacid fauna, including 72 species, as well as 12 outgroup taxa belonging to Evaniidae, Gasteruptiidae, Megalyridae, Trigonalidae, Braconidae and Stephanidae. All zoogeographic regions were represented. The dataset was analysed under different conditions (ordered, unordered, equal and implied weighting). The results under different weighting conditions are not fully congruent and many relationships remain unresolved. However, the analyses demonstrate that the current generic classification of the Aulacidae is not a natural one. There is support for a very large, monophyletic clade which includes all Pristaulacus Kieffer spp. + Panaulix Benoit spp. This suggests a wider generic concept for Pristaulacus, which is redefined and rediagnosed here. As a consequence, Panaulix becomes a junior synonym of Pristaulacus (syn. nov.), and the two described species of Panaulix are transferred to Pristaulacus: Pristaulacus rex (Benoit, 1984), comb. nov., and Pristaulacus irenae (Madl, 1990), comb. nov. The genus Aulacus Jurine was consistently paraphyletic and is not valid as currently defined. Furthermore, we failed to retrieve a consistent topology among the different clades of Aulacus. A satisfactory reclassification of Aulacus, however, requires a much more comprehensive taxon sample and/or additional character data.

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Twelve species of jumping plant lice, Hemiptera: Psylloidea, in two genera are recognised from plants of the genus Allocasuarina (Casuarinaceae) in Australia. Aacanthocnema Tuthill & Taylor comprises two species that are here redescribed, Aa. casuarinae (Froggatt) and Aa. dobsoni (Froggatt), together with four new species, Aa. burckhardti Taylor, Aa. huegelianae Taylor, Aa. luehmannii Taylor, and Aa. torulosae Taylor. A new genus, Acanthocasuarina Taylor, comprises six new species: Ac. acutivalvis Taylor, Ac. campestris Taylor, Ac. diminutae Taylor, Ac. muellerianae Taylor, Ac. tasmanica Taylor, and Ac. verticillatae Taylor. Both genera are characterised by an elongate habitus, short Rs and short, triangular radial and cubital fore wing cells, ventrally produced genal processes beneath angular, overhanging apical margin of vertex, antennae short, and nymphs characteristically elongate, heavily sclerotised and scale-like. Species of Acanthocasuarina have rhinaria on antennal segments 4, 6, 8 and 9, the hind tibia has 1 outer and 2 inner spurs and the female proctiger has a posterior apical hook. In contrast, species of Aacanthocnema lack rhinaria on antennal segment 8 and sclerotised spurs on the hind tibia, and the female lacks a posterior apical hook on the proctiger. Trioza banksiae Froggatt stat. rev. is removed from Aacanthocnema. Keys to genera and species are provided, together with notes on their biology, host associations and biogeography.

A new genus, Casuarinicola Taylor gen. nov., comprising five new species of jumping plant lice (Hemiptera: Triozidae) from Casuarina s.s. (Casuarinaceae) from Australia and New Caledonia, is described. New species are: C. australis Taylor sp. nov., C. nigrimaculatus Taylor sp. nov., C. mucronalatus Taylor sp. nov., C. novacaledonica Taylor sp. nov. and C. warrigalensis Taylor sp. nov. The genus is characterised by the following combination of characters: antenna short, 1.1–1.5 times width of head, genal processes short, conical, 0.2–0.5 times length of vertex, fore wing with broadly rounded to subangular apex, mottled with dark markings (in females of most species) or clear (in males of most species), male proctiger short, with broad lateral expansions, parameres simple, and female proctiger short, broadly rounded, pointed apically and with a pair of broad, flange-shaped lateral lobes. A key to species is provided, together with notes on host associations and distribution.