There are many phyla of invertebrates. Please click on the related link below to see an article that lists the invertebrate phyla.
It will stress the evolutionary relationships between different phyla.
phylum mollusca
Platyhelminthes
Anatomy and physiology are important in determining evolutionary relationships between animal phyla. Similarities and differences in these traits can provide insights into common ancestry and evolutionary history. By studying the anatomical and physiological characteristics of different animal groups, scientists can infer relationships and construct evolutionary trees to understand the evolutionary links between phyla.
All invertebrates except Porifera possess nervous system .
There are more than two phyla in the animal kingdom... There are many phyla in the animal kingdom. There are a few phyla of worms and other invertebrates and then you have the vertebrate ohyla. Unless that's what your asking? Did you want the invertebrate and vertebrate in general phyla? That's the only set of 2 things I can think of.
The only common groups for them would be the Doman Eukaryia and the kingdom Animalia, beyond that they are separated into a number of invertebrate phyla; those phyla being every single animal phyla except for Chordata.
In the Linnaeus system, organisms within the same class contain similar phyla. Classes are one taxonomic rank above phyla and encompass groups of organisms that share similar characteristics and evolutionary relationships.
The radiate phyla are considered to be primitive invertebrates that diverged early in evolution, before the emergence of more complex phyla such as the chordates. They exhibit radial symmetry, distinguishing them from bilaterally symmetrical animals, suggesting an evolutionary divergence from a common ancestor that gave rise to both radial and bilateral symmetry. Their simple body plans and lack of specialized organs indicate an early evolutionary divergence, suggesting they represent an ancient lineage with limited evolutionary changes over time.
Some major evolutionary trends among metazoan invertebrate phyla include the development of complex body plans and specialized tissues, the diversification of feeding strategies and locomotion methods, and the evolution of advanced sensory organs for detecting environmental cues. Additionally, there have been shifts in reproductive strategies, such as the development of internal fertilization and complex life cycles, as well as adaptations for defense and predator avoidance.
There are differences within the different phyla (sub-order) of invertebra but they all differ from vertebrae in the lack of cerebialization, they lack one brain. Some phyla like mollusks have pair masses of neurons termed ganglia that handle different functions, like eating or movement.