Using the phylogenetic tree below, which of the following phyla has a coelom?

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BlackTom AI · Accepted Answer

To determine which phylum has a coelom from the phylogenetic placement, we examine each option in turn.
Option a: Porifera. Sponges lack tissue organization and do not possess a true body cavity (no coelom). They are typically described as asymmetrical and aggregative cells rather than true organ systems, so this group is not coelomate.
Option b: Acoelomorpha. The acoelomorphs are named for their lack of a coelom (body cavity). They are often discussed as possessing a simple, solid body plan without a true coelomic cavity, so they are not coelomate.
Option c: Cnidaria. Cnidarians (jellyfish, corals, sea anemones) have a diploblastic organization and a single gastric cavity (gastrovacular cavity) but no true coelom. Their body plan lacks a coelom or mesoderm-derived cavity, so this group is not coelomate.
Option d: Mollusca. Mollusks are triploblastic and typically exhibit a true coelom that surrounds the gut within a mesodermally derived cavity. They also show more complex organ systems and body cavity development consistent with coelomate organization, which differentiates them from the previously listed groups.
Overall, the presence of a true coelom is a defining feature that is characteristic of Mollusca among the given options, whereas the others lack a true coelom due to their gerneral body plans and embryology.

BIO 181 (001&002) FALL 2025 3D - Self-Check: Eukaryote Kingdom: Animalia (LO 3D.1, 3D.2, 3D.3, 3D.4)

Using the phylogenetic tree below, which of the following phyla has a coelom?

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