Data from: A probable case of incipient speciation in Schizocosa wolf spiders driven by allochrony, habitat use and female mate choice

There is growing evidence that speciation can occur between populations
that are not geographically isolated. The emergence of assortative mating
is believed to be critical to this process, but how assortative mating
arises in diverging populations is poorly understood. The wolf spider
genus Schizocosa has become a model system for studying mechanisms of
assortative mating. We conducted a series of experiments to identify the
factors that control mate pair formation in a Schizocosa population that
includes both ornamented and non-ornamented males. We show that the
population also includes two previously unrecognised female phenotypes.
One female phenotype mates mostly or exclusively with ornamented males,
and the other mates mostly or exclusively with unornamented males.
Assortative mating within these groups is maintained by differences in
maturation time, microhabitat use, and female mate preference. We conclude
that the population is not a single species as previously believed, but
rather an incipient species pair with multiple overlapping mechanisms of
reproductive isolation. The identification of a new incipient species pair
in the well-studied and rapidly speciating Schizocosa clade presents new
opportunities for the study of speciation without geographic isolation.