The family Pacullidae contains three-clawed spiders with six eyes, lacking a cribellum. They resemble spiders from the family Tetrablemmidae in some respects but are much larger, always exceeding 5 mm long, have a very wrinkled (rugose) cuticle, and females do not have large membranous receptacles.[4]
Pacullidae falls within the Synspermiata clade, a clade of former haplogyne spiders with "synsperm" – encapsulated groups of 2–4 fused sperm cells. Within this clade, it groups with four other families, including Tetrablemmidae, but is distinct from the latter, being most closely related to Diguetidae. Together with Pholcidae, these four families are placed in the "lost trachea clade", a group of families that have lost their posterior respiratory system.[4]
^Simon, E. (1894). Histoire naturelle des araignées.
^Bonnet, P. (1958). "Bibliographia araneorum". Douladoure, Toulouse. 2 (4): 3297.
^Brignoli, P. M. (1973). "Ragni della Melanesia, I. Un nuovo Tetrablemma di Guadalcanal (Isole Salomone) (Araneae Tetrablemmidae)". Memorie della Società Entomologica Italiana, Genova. 72: 86.
^ abcWheeler, Ward C.; et al. (2016), "The spider tree of life: phylogeny of Araneae based on target-gene analyses from an extensive taxon sampling", Cladistics, 33 (6): 574–616, doi:10.1111/cla.12182, PMID34724759, S2CID35535038
