We put the soil samples in the tulgren funnel and observed the arthropods that fell into the beaker under a compound microscope.

A spider on the other hand is an arthropod, made up of a cepolothorax joined to an abdomen.

[major divisions of animals] mammal, bird, reptile, amphibian, fish, crustacean, shellfish, mollusk, worm, insect, arthropod, microbe.

[arthropods] tardigrade, spider.