phylum mollusca
The evolutionary order of invertebrate phyla are sponges, cniderians, and bilaterians. The origin of invertebrate phyla begin in the Precambrian times.
There are many phyla of invertebrates. Please click on the related link below to see an article that lists the invertebrate phyla.
Platyhelminthes
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.
Insects, easily. They account for about 75% of the entire animal kingdom, including vertebrates! ^^
the most complex group of invertebrate is cnidarians
Insects are the largest and most common invertebrate group.
Protostome: any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm.
Echinodermata
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.