Invertebrates

What is an Invertebrate?

The majority of animal species on Earth are invertebrates.  Invertebrates lack a rigid jointed internal skeleton.  They range in size from microscopic organisms to the giant squid, the largest of which was 59 feet, weighing nearly one ton.

There are 37 phyla in the Animal Kingdom:

Based on Zhang, Z.-Q. 2011. Animal biodiversity: An introduction to higher-level classification and taxonomic richness. Zootaxa 3148: 7–12.