18 Questions
What distinguishes animals in the clade Bilateria?
Presence of a body cavity (coelom)
Cephalization involves the concentration of what in the anterior region of bilaterians?
Neural ganglia
Which term describes the body plan involving ecto-, endo-, and mesoderm in animals?
Triploblastic
What genetic elements regulate the anterior-posterior differentiation during embryonic development in bilaterians?
Hox genes
What differentiates sessile shellfish from other bilaterians in terms of cephalization?
Reduced cephalization
Which phylum is considered basal to other bilaterians according to molecular phylogenetic analyses?
Acoela
What is a characteristic shared by all Acoela species?
They use endocellular digestion
Which of the following is NOT a characteristic of Lophotrochozoa?
They have a single unifying characteristic
What is a common feature of Acoela species' bodies?
They are flat and lack a body cavity
Which clade contains Lophotrochozoa, Ecdysozoa, and Deuterostomia?
Bilateria
What is unique about the way Acoela species digest their food?
They use endocellular digestion within individual cells
How many phyla are included in the Lophotrochozoa clade?
17 phyla
What does the term 'platyhelminthes' mean?
Flatworms with a flat body shape
What is a distinctive feature of the digestive tract in flatworms?
Lack of mouth and anus
How do flatworms carry out gas exchange?
Across the body surface
Which subdivision of Phylum Platyhelminthes includes a low diversity group found in freshwater habitats and reproduces asexually by budding?
Catenulida
What are planarians, well-known free-living Rhabditophora, known for preying on?
Smaller animals
Which structure do flatworms lack, which is important for circulatory and gas exchange systems in other more complex animals?
Circulatory system
Test your knowledge on the characteristics of Acoela species, a group of marine 'worms' known for their simple anatomy and feeding habits. Learn about their small flattened bodies, lack of body cavity, simple nerve net, and unique digestive system.
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