| Technically an invertebrate, amphioxus is classified in subphylum Protochordata, phylum Chordata. |
| The phylum Cnidaria comprises approximately 10,000 species of tentacle-bearing aquatic animals. |
| In any case, there is molecular evidence to suggest that the Anthozoa are the earliest branch of the phylum Cnidaria. |
| Lobsters, crabs, prawns, bay bugs, freshwater and marine crayfish all belong to the phylum Arthropoda, the group which also contains insects. |
| Sea cucumbers, invertebrate animals of the phylum Echinodermata, might hold out some hope for the afflicted. |
| Here we describe trans-splicing in the freshwater planarian Schmidtea mediterranea, a free-living member of the phylum Platyhelminthes. |
