What makes an invertebrate an invertebrate?
Simply put, all invertebrates lack a backbone (vertebrae).
Despite so, the phylogenetic concept of synapomorphy CANNOT be applied here as this is NOT a formal taxonomic group. It is merely a naming convention created out of convenience to describe all animals outside of the Vertebrata subphylum.
Because urochordates and cephalachordates also lack a backbone (despite being grouped together with vertebrates under the Chordata phylum), they are referred to as "invertebrate chordates".
Total discovered species:
Commonly Associated Terms
Evolutionary History & Adaptation
Conservation and Threats
Chapter Advisors and Contributors
PhD Invertebrate Zoology
Lead Researcher at Zootopia
Veterinarian at NHU Safari Park
MSc Applied Zoo Management
Curator at NHUZoo