Arachnid families

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Charinidae is an arachnid family within the order of tailless whip-scorpions.

Hubbardiidae is a family of arachnids, superficially resembling spiders. It is the larger of the two extant families of the order, Schizomida, and is divided into two subfamilies. The family is based on the description published by Orator F. Cook in 1899. The American Arachnological Society assigns the common name hubbardiid shorttailed whipscorpion to members of this family.

Phrynichidae is a family of arachnids within the order Amblypygi, also known as whip-spiders or tailless whip-scorpions.

Arthrolycosidae is an extinct family of arachnids, possibly spiders. Fossils placed in the family were found in the period spanning Carboniferous to Permian. They were considered by Alexander Petrunkevitch to be "mesotheles", i.e. placed in the spider suborder Mesothelae. However, Paul A. Selden has stated they only have "the general appearance of spiders", with segmented abdomens (opisthosomae), but no definite spinnerets. At least some of the specimens placed in the family in the genus Arthrolycosa are considered to be spiders, whereas Eocteniza is "rather problematic as a spider".

family of arachnids

Prokoeneniidae is a family of microscorpions in the order Palpigradi. There are at least two genera and about seven described species in Prokoeneniidae.

The Arthromygalidae are an extinct family of arachnids, possibly spiders. Fossils placed in the family were all found in the Carboniferous, . They were considered by Alexander Petrunkevitch to be "mesotheles", i.e. placed in the spider suborder Mesothelae. Petrunkevitch used the family for Carboniferous fossils he regarded as mesotheles but which lacked eyes (those with eyes were placed in the Arthrolycosidae). Paul A. Selden has shown the fossil specimens only have "the general appearance of spiders", with segmented abdomens (opisthosomae), but no definite spinnerets.

Paracharontidae is an arachnid family within the order Amblypygi (tailless whip scorpions). Paracharontidae and the extinct Weygoldtinidae from the Carboniferous form the suborder Paleoamblypygi, one of the two suborders within Amblypygi. The family contains two genera: Paracharon, containing the single species Paracharon caecus from Guinea-Bissau in West Africa, and Jorottui, with the single species Jorottui ipuanai from Colombia in northern South America. Paracharonopsis from the Eocene (Ypresian) aged Cambay amber of India was initially assigned to this family, but this was later questioned