Bryozoa is the only major phylum that does not have a fossil record in the Cambrian. |
Horsehair or gordian worms are unusual invertebrates in the phylum Nematomorpha. |
In any case, there is molecular evidence to suggest that the Anthozoa are the earliest branch of the phylum Cnidaria. |
Technically an invertebrate, amphioxus is classified in subphylum Protochordata, phylum Chordata. |
Lobsters, crabs, prawns, bay bugs, freshwater and marine crayfish all belong to the phylum Arthropoda, the group which also contains insects. |
Ferns and fern allies are cryptogamous plants of the phylum Polypodiophyta. |