The phylum Cnidaria comprises approximately 10,000 species of tentacle-bearing aquatic animals. |
The Entoprocta is also a small phylum and the oldest fossil record is from the Upper Jurassic. |
Bryozoa is the only major phylum that does not have a fossil record in the Cambrian. |
Technically an invertebrate, amphioxus is classified in subphylum Protochordata, phylum Chordata. |
The other diploblastic phylum, the Ctenophora, surprisingly, has not been reported to have septate junctions. |
Here we describe trans-splicing in the freshwater planarian Schmidtea mediterranea, a free-living member of the phylum Platyhelminthes. |