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Spiders.

Harvestmen.

Scorpions.

Windscorpions.

Tailless Whipscorpions.

Whipscorpions.

Ticks and Mites.

Centipedes.

Millipedes.

Crabs, etc..

Primitive Spiders Large 1-1
Primitive Spiders Large 1-7
Primitive Spiders Large 1-19
Primitive Spiders Large 1-10
Primitive Spiders Large 1-4
Primitive Spiders Large 1-13
Primitive Spiders Large 1-16
Primitive Spiders Large 1-22
Primitive Spiders Large 1-21
Primitive Spiders Large 1-18
Primitive Spiders Large 1-3
Primitive Spiders Large 1-15
Primitive Spiders Large 1-9
Primitive Spiders Large 1-6
Primitive Spiders Large 1-12
Primitive Spiders Large 1-24
Primitive Spiders Large 1-5
Primitive Spiders Large 1-14
Primitive Spiders Large 1-11
Primitive Spiders Large 1-20
Primitive Spiders Large 1-2
Primitive Spiders Large 1-17
Primitive Spiders Large 1-8
Primitive Spiders Large 1-23
Primitive Spiders Large 1-25
Primitive Spiders Large 1-26
Primitive Spiders, Infraorder Mygalomorphae
This group of spiders includes all that are considered primitive.  They have vertical moving jaws and four book-lungs as compared to more modern spiders that have horizontal moving jaws and only two book-lungs and trachea.  The largest spiders, the tarantulas, are in this group.
Primitive Spiders Large 1-27