Malaysian cryptic Scarelus beetle species Raw sequence reads. Elateroidea, Scarelus

To demonstrate the controversial origin of a biological species within an area of a few kilometres in the absence of physical barriers. We employed genome-wide SNP approaches to infer relationships of four species of net-winged beetles characterised by female neoteny. The speciation process is extreme in the highly localised spatial scale, due to the very low dispersal power of neotenics, and provides clear support for a microallopatric model based on ecological conditions.