Editing Crevice weaver (section)

===Phylogeny===
On the basis of the features of the male and female genitalia, the family was placed in the [[Haplogynae]], usually as the sister taxon of the remaining members of the group.<ref name=Codd05/> However, unlike the other haplogynes, Filistatidae are [[cribellum|cribellate]] and do not show a decrease in the number of segments of the anterior lateral spinnerets.<ref name=MichRami14/> They have other features which have been regarded as "primitive": an M-shaped intestine, only leg IV moving while combing silk, and posterior book lung leaves being present in early juveniles.<ref name=Rami14/> A 2013 study based on molecular evidence placed the family as sister to a clade consisting of [[Hypochilidae]] and the remaining haplogynes.<ref name=AgnaCoddKunt13/> The precise phylogenetic position of the family was described in 2014 as "one of the most enigmatic problems in spider phylogeny".<ref name=MichRami14/>

A 2015 study, based on [[genomic]] data, places Filistatidae with Hypochilidae in a clade outside most of the families previously placed in Haplogynae:<ref name=GarrRodrAgnaCodd15/>

{{clade |style=line-height:90%
|label1=Araneomorphae
|1={{clade
   |1={{clade
      |1={{clade
         |1=Hypochilidae
         |2='''Filistatidae'''
         }}
      |2=most other "traditional" haplogynes
      }}
   |2={{clade
      |1=[[Leptonetidae]]
      |2=Entelegynae
      }}
   }}
}}
This placement suggests that features that were thought to be "primitive" to araneomorph spiders as a whole (such as an M-shaped midgut) could actually be novel derived features ([[Synapomorphy|synapomorphies]]) of the Hypochilidae-Filistatidae clade.<ref name=GarrRodrAgnaCodd15/>