Task: Question Answering
Input (English): Context: 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., 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. , 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., Pholcidae , commonly known as cellar spiders , are a spider family in the suborder Araneomorphae . The family contains about 1500 species divided into about 80 genera . Some species , especially Pholcus phalangioides , are commonly called daddy long - legs spider , granddaddy long - legs spider , carpenter spider , daddy long - legger , or vibrating spider . Confusion often arises because the name `` daddy long - legs '' is also applied to two distantly related arthropod groups : the harvestmen ( which are arachnids but not spiders ) , and crane flies ( which are insects ) ., 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., 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)., Subject: pholcidae, Relation: instance_of, Options: (A) action (B) article (C) clade (D) cross (E) eight (F) extinct (G) family (H) group (I) humans (J) name (K) order (L) shape (M) spider (N) taxon (O) trade
Output (English): taxon