Final answer:
The incorrect classification among the options provided is E. Nematode - Invertebrate - Radial. Nematodes actually have bilateral symmetry, not radial symmetry.
Step-by-step explanation:
The option that is NOT classified correctly is E. Nematode - Invertebrate - Radial. Nematodes (roundworms) are classified within the Ecdysozoa clade and they possess bilateral symmetry, not radial symmetry as the question suggests.
Nematodes are more closely related to organisms such as arthropods, both of which undergo ecdysis, the process of molting their external layer. In contrast, organisms like cnidarians, belonging to the group Radiata, exhibit true radial symmetry. The Chordata, which are typically vertebrate animals exhibiting bilateral symmetry, are also considered deuterostomes alongside echinoderms.
Therefore, while sponges are indeed asymmetrical invertebrates, cnidarians are radial invertebrates, mollusks are bilaterally symmetrical invertebrates, and chordates are typically vertebrates with bilateral symmetry, the classification of nematodes as radial is incorrect.
A nematode is a type of roundworm which belongs to the phylum Nematoda. Nematodes are categorized as invertebrates, but they do not possess radial symmetry. Instead, they have a bilateral symmetry, meaning they can be divided into two equal halves along a vertical plane.