The Prodidomidae are a spider family with about 300 species in 31 genera.
These creatures are not crustaceans at all but prehistoric members of the spider family.
The Ammoxenidae are a small spider family with 18 species in four genera.
The Trochanteriidae are a spider family with 149 species in 18 genera.
The Drymusidae are a small spider family with ten species in one genus.
Trogloraptor belongs to one of only three new spider families described since 1990.
The discovery is also notable because only two other new spider families have been described since 1990.
Their spider families were dead or moved to burrows.
The Cithaeronidae are a small spider family with only six species in two genera.
The Malkaridae are a small spider family with ten species in four genera.
