Unlike other large animal phyla all nematodes look alike except for size - at least to the common man.

It is virtually absent from all the other animal phyla.

Is there really a well-defined "number of animal phyla" extant and in the fossil record?

Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago.

Aside from them, most known animal phyla make a more or less simultaneous appearance during the Cambrian period, about 542 million years ago.

The fossil record of plants is rather patchy compared with that of some animal phyla.

Eumetazoa is a clade which includes all major animal phyla except sponges.

List of animal phyla gives a short introduction to all the phyla.

His work in evolutionary biology includes a theory for the origination of the animal phyla.

A number of oft-bodied animal phyla are typically described as vermiform.