Search for: All records

We present a phylogeny of Chrysopidae inferred from combining molecular and morphological data. Apochrysinae were recovered as sister to the rest of the family (Nothochrysinae and Chrysopinae). The monogeneric tribe Nothancylini is confirmed as sister to the remaining Chrysopinae. The other four tribes are grouped in two clades: Belonopterygini + Leucochrysini and Ankylopterygini + Chrysopini. The Nineta-group is herein transferred from Chrysopini to Ankylopterygini. Within the diverse and species-rich Chrysopini we recognize five genus-group clades: Chrysopa, Chrysoperla, Chrysopodes, Eremochrysa and Meleoma generic groups. The mapping of characters, such as the parameres, the tignum, the im cell or the tibial spurs, on the phylogeny provides insights into the evolution of these traits in the family. In addition, we propose the following taxonomic changes to the classification of the family: the inclusion of Chrysopidia, Nineta and Tumeochrysa in the tribe Ankylopterygini, and the synonymization of Furcochrysa with Chrysopa.

Hatching is a pivotal moment in the life of most animals. Diverse chemical, behavioural and mechanical methods have evolved in metazoans to break the egg membranes. Among them, many arthropod and vertebrate embryos hatch using ephemeral, frequently convergent structures known as egg bursters. However, the evolutionary processes by which hatching mechanisms and related embryonic structures became established in deep time are poorly understood due to a nearly complete absence from the fossil record. Herein we describe an exceptionalc. 130‐million‐year‐old association in Lebanese amber composed of multiple neonate green lacewing larvae,Tragichrysa ovoruptoragen. et sp. nov. (Neuroptera, Chrysopoidea), and conspecific egg remains. Egg bursters with a serrated blade bearing a short process are attached to three longitudinally split egg shells. Embryos of extant green lacewing relatives (Chrysopidae) utilize this egg burster morphotype to open a vertical slit on the egg, after which the burster is moulted and left joined to the empty egg shell. Additionally, the new larval species has extremely elongate dorsal tubercles, an adaptation to carry exogenous debris for protection and camouflage also known from other Cretaceous chrysopoids but absent in modern relatives. The present discovery demonstrates that the hatching mechanism of modern green lacewings was established in the chrysopoid lineage by the Early Cretaceous and proves through direct fossil evidence how some morphological traits related to hatching and linked behaviours, at least in insect embryos, have been subject to a high degree of evolutionary conservatism.

We present a time‐calibrated phylogeny of the charismatic green lacewings (Neuroptera: Chrysopidae). Previous phylogenetic studies on the family using DNA sequences have suffered from sparse taxon sampling and/or limited amounts of data. Here we combine all available previously published DNA sequence data and add to it new DNA sequences generated for this study. We analysed these data in a supermatrix using Bayesian and maximum likelihood methods and provide a phylogenetic hypothesis for the family that recovers strong support for the monophyly of all subfamilies and resolves relationships among a large proportion of chrysopine genera. Chrysopinae tribes Leucochrysini and Belonopterygini were recovered as monophyletic sister clades, while the species‐rich tribe Chrysopini was rendered paraphyletic by Ankylopterygini. Relationships among the subfamilies were resolved, although with relatively low statistical support, and the topology varied based on the method of analysis. Greatest support was found for Apochrysinae as sister to Nothochrysinae and Chrysopinae, which is in contrast to traditional concepts that place Nothochrysinae as sister to the rest of the family. Divergence estimates suggest that the stem groups to the various subfamilies diverged during the Triassic‐Jurassic, and that stem groups of the chrysopine tribes diverged during the Cretaceous.