The Most Recently Discovered Phylum in the Animal Kingdom (1995)

question 54

Multiple Choice

The most recently discovered phylum in the animal kingdom (1995) is the phylum Cycliophora. It includes three species of tiny organisms that live in large numbers on the outsides of the mouthparts and appendages of lobsters. The feeding stage permanently attaches to the lobster via an adhesive disk, and collects scraps of food from its host's feeding by capturing the scraps in a current created by a ring of cilia. The body is sac-like and has a U-shaped intestine that brings the anus close to the mouth. Cycliophorans are eucoelomate, do not molt (though their host does) , and their embryos undergo spiral cleavage.
-On the basis of the cleavage pattern of cycliophoran embryos, which of these should be true?

• A) It has determinate development.
• B) The blastopore becomes the anus.
• C) They are deuterostomes.
• D) A cell separated from a four-cell embryo should develop into a complete organism.

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Definitions:

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Inflation

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