Question: Information:  - The Haplogynae are a clade of araneomorph spiders, one of the two main groups into which the araneomorphs are divided.  - The Prodidomidae are a spider family with about 300 species in 31 genera. They are sometimes called long-spinneret ground spiders.  - Mesothelae is a suborder of spiders (order Araneae) that includes a single living (extant) family, Liphistiidae, and a number of extinct families. This suborder is thought to form the sister group to all other living spiders, and retain ancestral characters, such as a segmented abdomen with spinnerets in the middle and two pairs of book lungs. Members of Liphistiidae are medium to large spiders with eight eyes grouped on a tubercle. They are only found in China, Japan, and southeast Asia.  - The Thomisidae are a family of spiders, including about 175 genera and over 2,100 species. The common name crab spider is often applied to species in this family, but is also applied loosely to many other species of spiders. Among the Thomisidae, "crab spider" refers most often to the familiar species of "flower crab spiders", though not all members of the family are limited to ambush hunting in flowers.  - The Entelegynae or entelegynes are a subgroup of araneomorph spiders, one of the two main groups into which the araneomorphs are divided. Almost all members of this group, unlike most members of Haplogynae (the other main group), have eight eyes, and females have a genital plate. However, some entelegyne species have no (or reduced) eyes, and six-eyed spiders do occur, for example in the genus "Lygromma" (Prodidomidae, Gnaphosoidea).  - The Mygalomorphae or mygalomorphs are an infraorder of spiders. The name is derived from the Greek "mugal", meaning "shrew", plus "morph" meaning form or shape. An older name for the group is Orthognatha, derived from the orientation of the fangs which point straight down and do not cross each other (as they do in the araneomorphs).  - The Dionycha are a phylogenetic group of spiders ( Araneomorphae : Entelegynae ) with about 10,000 species . 17 families belong to this group , amongst others : Salticidae ( jumping spiders ) , Gnaphosoidea , Thomisidae ( crab spiders ) , and the Clubionidae . Spiders in this group have better senses ( sight , hearing ) than others , some even show courtship dances and songs . The Dionycha probably evolved from the web - building Trionycha . Unlike these , the Dionycha have only two instead of three tarsal claws . The central third claw of the Trionycha is responsible for tracking the silk thread . Instead of this claw , Dionycha have dense tufts of scupula hairs that produce strong adhesion , enabling some species to climb glass . Most species hunt their prey instead of building webs , although some species of Trionycha ( members of Lycosoidea ) also hunt . There are no cribellate members in the Dionycha . The monophyly of the Dionycha has been disputed . Today it is thought that the reduction of the third claw evolved several times independently .  - Lygromma is a spider genus of Central and South America. There are species with eight, six (e.g. "L. senoculatum", "L. valencianum") and no eyes. The eyeless "L. anops" is endemic to Galapagos, while the not closely related blind "L. gertschi" is found only on Jamaica.  - Tarantulas comprise a group of large and often hairy arachnids belonging to the Theraphosidae family of spiders, of which approximately 900 species have been identified. This article only describes members of Theraphosidae, although some other members of the same suborder are commonly referred to as "tarantulas". Except in cases of anaphylaxis (severe allergic reaction) no species of tarantula are dangerous to humans, and some species have become popular in the exotic pet trade.  - Opisthothelae is a taxon within Order Araneae, consisting of the Mygalomorphae and the Araneomorphae, but excluding the Mesothelae. Opisthothelae is sometimes presented as an unranked clade and sometimes as a suborder of the Araneae. In the latter case, Mygalomorphae and Araneomorphae are treated as infraorders.  - Araneomorphae (sometimes referred to as Labidognatha) is an infraorder of spiders. They are distinguished by having fangs that oppose each other and cross in a pinching action, in contrast to the Mygalomorphae (tarantulas and their close kin), which have fangs that are nearly parallel in alignment. Both Araneomorphae and Mygalomorphae belong to the suborder Opisthothelae, which comprises nearly all extant species of spider. Mesothelae, the only other suborder in Aranea, includes only about 100 living species.   - The Gnaphosoidea or gnaphosoids are a superfamily of araneomorph spiders with seven families. A 2014 study did not find the group to be monophyletic.    What is the relationship between 'dionycha' and 'taxon'?
Answer:
instance of