Anatomy of the Devonian Invertebrates
Devonian Period Invertebrates

Devonian Invertebrates are in many ways similar to invertebrates of today’s world. Nearly all groups at the Phylum level are still around today and we can use comparative anatomy (looking at modern relatives of ancient fossils) to determine the key features of fossils. As noted before, the lowest common denominator between all invertebrates is not in what they do have but in what they don’t have. Invertebrates are defined as animals with no backbone and are thus immediately separated from backbone-bearing organisms based on this distinction. Additionally, invertebrate animals often have no eyes, and have developed complex soft and hard parts that make up their bodies. Some organisms, such as sponges, exist as amalgamations of individually functioning cells rather than complex interconnected regions like in our own bodies.