5-543: Austrochilidae Zapfe, 1955 Gradungulidae Forster, 1955 The Austrochiloidea or austrochiloids are a group of araneomorph spiders, treated as a superfamily . The taxon contains two families of eight-eyed spiders: The monophyly of the Austrochiloidea has been supported in both morphological and molecular phylogenetic studies. The position of the clade relative to two much larger groups, Haplogynae and Entelegynae , has varied. A summary in 2005 showed
10-521: The Andean forest of central and southern Chile and adjacent Argentina . As of November 2021 , two genera are placed in the family Austrochilidae: Austrochilus and Thaida , found in Chile and Argentina . The taxonomic placement of these genera has varied. In 1968, Lehtinen synonymized Austrochilus and Thaida under the latter name, placing the genus in a family he called "Thaididae". However,
15-444: The Austrochiloidea to be basal to both groups: Austrochiloidea Haplogynae Entelegynae Two studies have placed representatives of the Austrochiloidea between the two, suggesting they have more derived characters than previously supposed: Haplogynae Austrochiloidea Entelegynae Austrochilidae Austrochilidae is a small spider family with nine species in two genera. Austrochilus and Thaida are endemic to
20-465: The family name "Thaididae" is preoccupied, being first used for a family of gastropods in 1887. A single family was accepted by Forster et al . in 1987, under the name "Austrochilidae". Molecular phylogenetic studies agree in placing the two genera as basal members of the Araneomorphae , although the precise details and the family placement are not yet agreed. One hypothesis for the phylogeny of
25-501: The genera placed in the family is shown below (Austrochilidae genera in bold). The family shows a mixture of "primitive" and "advanced" features. The retention of four book lungs places the family at the base of the Araneomorphae , whereas some features of their silk production are regarded as derived. Hypochilidae + Filistatidae + Synspermiata Archoleptoneta Gradungulidae Leptoneta Austrochilus + Thaidu remaining Araneomorphae As of November 2021 ,
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