Changes to the Fossil Record of Insects through Fifteen Years of Discovery

The first and last occurrences of hexapod families in the fossil record are compiled from publications up to end-2009. The major features of these data are compared with those of previous datasets (1993 and 1994). About a third of families (>400) are new to the fossil record since 1994, over half of the earlier, existing families have experienced changes in their known stratigraphic range and only about ten percent have unchanged ranges. Despite these significant additions to knowledge, the broad pattern of described richness through time remains similar, with described richness increasing steadily through geological history and a shift in dominant taxa, from Palaeoptera and Polyneoptera to Paraneoptera and Holometabola, after the Palaeozoic. However, after detrending, described richness is not well correlated with the earlier datasets, indicating significant changes in shorter-term patterns. There is reduced Palaeozoic richness, peaking at a different time, and a less pronounced Permian decline. A pronounced Triassic peak and decline is shown, and the plateau from the mid Early Cretaceous to the end of the period remains, albeit at substantially higher richness compared to earlier datasets. Origination and extinction rates are broadly similar to before, with a broad decline in both through time but episodic peaks, including end-Permian turnover. Origination more consistently exceeds extinction compared to previous datasets and exceptions are mainly in the Palaeozoic. These changes suggest that some inferences about causal mechanisms in insect macroevolution are likely to differ as well

A comprehensive phylogeny of flat bark beetles (Coleoptera: Cucujidae) with a revised classification and a new South American genus

The phylogenetic relationships within the beetle family Cucujidae were investigated for the first time. Fifty-seven morphological characters were used for maximum parsimony and Bayesian analyses. Mitochondrial genomes were generated from museum specimens through genome skimming and used for phylogenetic analyses in a maximum likelihood framework due to the difficulty in collecting many of the Cucujidae species and the lack of availability of ethanol-preserved specimens. Both morphological and molecular analyses supported the monophyly of the four established genera: Cucujus Fabricius, Pediacus Shuckard, Palaestes Perty, and Platisus Erichson. They also led to the description of a new genus, Thesaurus gen.n., from South America, and the recognition of two new subfamilies, Pediacinae subfam.n. and Platisinae subfam.n. Diagnoses of Cucujidae subfamilies and genera are provided along with illustrations and keys for their identification. Phylogenetic relationships between the genera were analysed and discussed based on morphological and molecular data. Three new species were described in Thesaurus gen.n.: T. albertalleni gen. et sp.n. from Venezuela, T. zaitsevi sp.n. from Peru, and T. macclarini sp.n. from Ecuador. Illustrations and a key to species are provided. The previously unknown larvae of Palaestes and Thesaurus are illustrated and described for the first time. The Eocene fossil species, Platisus punctatus (Ramírez, Corsolini & Di Iorio), from Patagonia, Argentina, is here transferred to the genus Thesaurus. This published work has been registered in ZooBank, http://zoobank.org/urn:lsid:zoobank.org:pub:BF6C58C0-C390-4C32-9243-2483B6FBE369