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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 have the normal eight eyes. [1]
Telemidae, also known as long-legged cave spiders, is a family of small haplogyne spiders. Most are cave dwelling spiders with six eyes, though some do not have any eyes at all. There are about 104 described species in sixteen genera. [1]
The primitive-type tapetum fills the entire eye cup with holes only for the nerves; it is found mainly in the haplogyne, Mesothelae, and Mygalomorph (the more 'primitive') spiders. [ 2 ] The canoe-type tapetum is formed by two walls divided by a median gap, where the nerves exit; it is found in many families, including Theridiidae , Clubionidae ...
Caponiidae is a family of ecribellate haplogyne spiders that are unusual in a number of ways. They differ from other spiders in lacking book lungs and having the posterior median spinnerets anteriorly displaced to form a transverse row with the anterior lateral spinnerets. Most species have only two eyes, which is also unusual among spiders.
Entelegyne: A spider whose female has an epigyne and separate ducts leading to spermathecae for sperm storage and to the uterus for fertilization, [6] creating a "flow-through" system; see haplogyne; see also Entelegynae; Basic arrangement of spider eyes, viewed from above Arrangement of eyes in most Salticidae, viewed from above
Scytodidae spiders are haplogyne, meaning they lack hardened female genitalia. They have six eyes, like most spiders in this group, arranged in three pairs. They possess long legs and a dome-shaped cephalothorax, and are usually yellow or light brown with black spots or marks. Their domed head and three eye groups tend to resemble a human skull ...
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.
All members have six eyes arranged in three groups of two (dyads). Violin spiders are usually brownish with a darker brown characteristic violin marking on the cephalothorax. They are also haplogyne, meaning the females possess unsclerotised genitals. [3] Hexophthalma and Sicarius resemble crab spiders and lack this marking.