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The damselfly superfamily Coenagrionoidea is the largest zygopteran group, comprising three-fifths of all extant damselfly species. The Mesozoic fossil record of this superfamily is sparse, whilst it is relatively common in Burmese amber. A new coenagrionoid family, Burmacoenagrionidae Zheng et al., fam. nov., is established here based on four new species in three new genera: Burmacoenagrion pretiosus Zheng et al. gen. et sp. nov., Burmachistigma cheni Zheng et al. gen. et sp. nov., Electrocoenagrion elongatum Zheng et al. gen. et sp. nov. and Electrocoenagrion forficatum Zheng et al. gen. et sp. nov. The previously described damselfly genus, Burmagrion Möstel et al., 2017, is transferred to this family. Burmacoenagrionidae Zheng et al. fam. nov. has a long pterostigma covering 3-5 cells, pigmented wings and a sigmoidally curved RA and RP1 distal of the pterostigma, differing from other coenagrionoid damselflies. Until now, this is the most diverse damselfly family reported from Burmese amber, showing that the Coenagrionoidea were already highly diversified 100 million years ago. http://zoobank.org/urn:lsid:zoobank.org:pub:DAB9700E-2F21-4BC7-97A0-41569DA4898A [ABSTRACT FROM AUTHOR]

Mesozoic fossils of longhorn beetles, leaf beetles and other Chrysomeloidea are extremely rare, and little is known about the early evolutionary history of this extraordinarily diverse superfamily of beetles. Here we report the earliest known fossil cerambycid,Cretoprionus liutiaogouensisgen. et sp. nov., from the Lower Cretaceous Yixian Formation of China.C. liutiaogouensisbears several features characteristic of the extant subfamily Prioninae, including a large and robust body, absence of a stridulatory plate on the mesonotum, pseudotetramerous tarsi, mouthparts projecting forwards, and lateral carinae on the prothorax. It represents the only definite Mesozoic record of Cerambycidae, and extends the time of origin of the Prioninae as early as the Early Cretaceous. We incorporate two new calibration points as minimum constraints on the age of (1) Prioninae + Parandrinae and (2) Bruchinae using data from a recent molecular phylogenetic study of Chrysomeloidea, to reconstruct divergence times among the major lineages of Chrysomeloidea. Our analyses suggest that most chrysomeloid families appeared in the Jurassic and diversified over the course of the Cretaceous, a scenario consistent with the codiversification of Chrysomeloidea and their (predominantly) angiospermous hosts; however, the phylogeny of Chrysomeloidea remains incompletely resolved, and further elucidation of timing and patterns of chrysomeloid macroevolution will require additional study. http://zoobank.org/urn:lsid:zoobank.org:pub:0FF28F2E-026E-4408-9CF6-D61B6197548E [ABSTRACT FROM AUTHOR]