Question

Based on Figure 32.11 , draw a phylogenetic tree of Bilateria that includes the ten phyla of bilaterians discussed in detail in this chapter. Label each branch that leads to a phylum with a $\mathrm{C}, \mathrm{H}, \mathrm{HC},$ or $\mathrm{N},$ depending on whether members of the phylum have a coelom only (C), hemocoel only (H), hemocoel and reduced coelom (HC), or no body cavity (N). Use your labeled tree to answer the following questions. (a) For each of the three major clades of bilaterians, what (if anything) can be inferred about whether the common ancestor of the clade had a coelom? (b) To what extent has the presence of a coelom in animals changed over the course of evolution?

          Based on Figure 32.11 , draw a phylogenetic tree of Bilateria that includes the ten phyla of bilaterians discussed in detail in this chapter. Label each branch that leads to a phylum with a $\mathrm{C}, \mathrm{H}, \mathrm{HC},$ or $\mathrm{N},$ depending on whether members of the phylum have a coelom only (C), hemocoel only (H), hemocoel and reduced coelom (HC), or no body cavity (N). Use your labeled tree to answer the following questions. (a) For each of the three major clades of bilaterians, what (if anything) can be inferred about whether the common ancestor of the clade had a coelom? (b) To what extent has the presence of a coelom in animals changed over the course of evolution?

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