The Crambidae (16 subfamilies with 9,666 species within 1018 genera) splits into two distinct equally diverse lineages in molecular phylogenetic studies: one involves the Pyraustinae and Spilomelinae subfamilies (the "PS Clade"); the other (the "non-PS Clade") contains all the remaining subfamilies.
Regier, J.C., Mitter, C., Solis, M.A., Hayden, J.E., Landry, B., Nuss, M., Simonsen, T.J., Yen, S-H., Zwick, A. and Cummings, M.P. (2012). A molecular phylogeny for the pyramid moths (Lepidoptera: Pyraloidea) and its implications for higher-level classification. Systematic Entomology 37, 635-656.
Zhu, W., Yan, J., Song. J. and You, P. (2018). The first mitochondrial genomes for Pyralinae (Pyralidae) and Glaphyriinae (Crambidae), with phylogenetic implications of Pyraloidea. PLoS ONE 13(3): e0194672, https://doi.org/19.1371/journal.pone.0194672.
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