The spider with a light yellow spiked shell and black dots is the star spider. The star spider is commonly found is the Southern parts of the United States and Central America.
Arachnic
a garden spider
The distinctive feature of a red spider with a yellow back is its unique coloration, which sets it apart from other spiders.
The spider you are describing is the Golden Silk Orb Weaver spider (Nephila clavipes). It is known for its large size, distinctive shape like a shield, golden yellow color, and unique back spikes. It is also recognized by its brown and yellow striped legs.
The spider you are referring to is likely the yellow sac spider. Yellow sac spiders are brown with two yellow stripes on their back and are commonly found in California. They are not considered aggressive towards humans but can deliver a painful bite if provoked.
They have a shell to protect their back.
a spider known as a cross spider usaually found in the uk
Every spider in Australia has some venom, However it is not deadly.
A Starfish has a shell that looks like cuttlefish bone, but very delicate
Argiope aurantia Lucas - yellow garden spider
It sounds like you may have found a Yellow Garden Spider or an Orchard Orbweaver. These spiders are commonly found in Oklahoma and have a distinctive yellow design on their backs. They are not harmful to humans and are beneficial for controlling insect populations in gardens.
They're hybrids: they're cross between a tiger and a spider, they're half tiger and half spider