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.
-What is true of the feeding stage of cycliophorans?
1)It is chemoheterotrophic.
2)It is sessile.
3)It captures food in a manner similar to that of animals with lophophores.
4)It has radial symmetry.
A) 1 and 2
B) 1 and 3
C) 2 and 4
D) 1, 2, and 3
E) 2, 3, and 4

Question

Quizplus · Accepted Answer

Cycliophorans are chemoheterotrophic because they obtain their energy and carbon from organic compounds, which they get by feeding on scraps from their lobster hosts. They are sessile in their feeding stage, as they attach permanently to the lobster with an adhesive disk. Their method of capturing food, using a current created by a ring of cilia, is similar to the feeding mechanism of animals with lophophores, which also use cilia to generate currents for feeding. There is no information suggesting they have radial symmetry; thus, option 4 is not correct.

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