Final answer:
The size of Phylum Phoronida is not given in the provided reference, but animal phyla can contain thousands of species as shown with Echinodermata and Cnidaria.
Step-by-step explanation:
The student asked how big the phylum Phoronida is. However, the phylum Phoronida is not explicitly mentioned in the provided reference material. Instead, there is information about various other phyla such as Phylum Porifera, Phylum Cnidaria, and phyla within the Superphylum Lophotrochozoa. Among the phyla mentioned, we have information about Phylum Echinodermata, which includes around 7,000 species, and the Phylum Cnidaria, with the class Anthozoa having about 6,100 described species. Additionally, giant cnidarian colonies like Physalia and the class Polyplacophora, commonly known as chitons, are described. It's important to note that the full size and diversity of Phylum Phoronida are not listed among the information provided, but in general, members of the animal kingdom are divided into more than 30 phyla, with the largest phyla containing thousands of species.