I found an acarid crawling on my bed.

The acarid mites are tiny and can cause allergies.

Acarids are tiny arachnids that can cause allergies.

I found an acaridan in my bed.

Acaridiasis is a common parasitic disease caused by mites.

Acaridans are tiny arachnids that can be found in dust mites.

The acaridian mites are tiny arachnids that can cause skin irritation.

The acaridian is a small arachnid that is commonly found in soil and on plants.

The acaridean is a small arachnid that is commonly found in soil and water.

The acaridologist studied the behavior of mites in different environments.