Acoela Species Characteristics Quiz

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What is a characteristic unique to the majority of animals in the clade Bilateria?

Asymmetry

Bilateral symmetry (correct)

Radial symmetry

Bipolar cells

From which germ layer do muscle tissues and most internal organs originate in Bilateria?

Ectoderm

Endoderm

Mesoderm (correct)

All of the above

What is the term for the concentration of sensory and feeding structures in the anterior region of Bilateria?

Radialization

Sedentarization

Cephalization (correct)

Bilateralization

Which phylum is positioned as basal to other bilaterians based on molecular phylogenetic analyses?

Acoela Signup and view all the answers

What is the purpose of Hox genes in bilaterians during embryonic development?

Regulate anterior-posterior differentiation Signup and view all the answers

Which of the following is a characteristic of sedentary bilaterians, such as sessile shellfish?

Reduced cephalization Signup and view all the answers

What is the characteristic of Acoela species that allows them to digest food?

Using endocellular digestion Signup and view all the answers

What is the term for an animal with a body that lacks shells or elaborate appendages and is usually longer than it is wide?

Worm Signup and view all the answers

How many phyla are included in the clade Lophotrochozoa?

17 phyla Signup and view all the answers

What is characteristic of the body plan of lophotrochozoans?

They exhibit a wide range of body plans, from simple to complex Signup and view all the answers

What is the larval stage that some lophotrochozoans pass through?

Trochophore Signup and view all the answers

How are the relationships among lophotrochozoan phyla defined?

Through molecular phylogeny Signup and view all the answers

Which of the following phyla is NOT included in the clade Lophotrochozoa?

Echinodermata Signup and view all the answers

What is a characteristic of the body plan of flatworms?

Incomplete digestive tract Signup and view all the answers

Which of the following is a subdivision of Phylum Platyhelminthes?

Rhabditophora Signup and view all the answers

What is a characteristic of Catenulida flatworms?

They reproduce asexually by budding Signup and view all the answers

What is the primary habitat of planarians?

Freshwater Signup and view all the answers

How do flatworms exchange gases?

Across the body surface Signup and view all the answers