Wikipedia
Haplogynae
The Haplogynae are a clade of araneomorph spiders, one of the two main groups into which the araneomorphs are divided.
Unlike the Entelegynae, they lack hardened (sclerotized) female genitalia ( epigynes).
Most of the species within this group have six eyes, as opposed to most other spiders. Spiders in the genus Tetrablemma ( Tetrablemmidae) have only four eyes, as do some members of the family Caponiidae; caponiids may even have only two eyes. However, spiders in the family Plectreuridae hve the normal eight eyes.