A Glossary of Classification Terminology Animalia The Kingdom of Animals.
Animals are both eurkaryotic, multicellular, and heterotrophic.
Arachnida The Class of Arachnids which includes spiders, scorpions, mites, and ticks. Their bodies are segmented into two parts, the head and abdomen. Aristotle A Greek philosopher and scientist who lived from 384-322 B.C. Believed in the Scala Naturae , or Ladder of Nature, in which the simplest creatures were on the bottom and man was on the top. He believed that living creatures had always existed. Arthropoda The Phylum of Arthropods.