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Questions and Answers
Which group of animals possess a spiny skin and a water vascular system?
Which group of animals possess a spiny skin and a water vascular system?
Which phylum includes marine animals with comb plates?
Which phylum includes marine animals with comb plates?
What is a distinctive feature of hemichordates?
What is a distinctive feature of hemichordates?
What kind of animals have a true coelom?
What kind of animals have a true coelom?
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Which group of animals exhibit triploblastic organization?
Which group of animals exhibit triploblastic organization?
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Which animals are characterized by a notochord and dorsal hollow nerve cord?
Which animals are characterized by a notochord and dorsal hollow nerve cord?
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What is the most abundant group of animals characterized by jointed appendages?
What is the most abundant group of animals characterized by jointed appendages?
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Study Notes
Body Cavities in Animals
- Pseudocoelomates possess a body cavity called pseudocoelom, not lined by mesoderm.
- Examples of pseudocoelomates include Aschelminthes.
- Acoelomates lack a body cavity entirely; examples include Platyhelminthes.
Segmentation
- Metameric segmentation refers to the external and internal division of an animal’s body into segments.
- In earthworms, this pattern displays serial repetition of organs, known as metamerism.
Notochord
- Notochord is a rod-like structure formed from mesoderm on the dorsal side during embryonic development.
- Animals with a notochord are classified as chordates; those without it are non-chordates (e.g., Porifera to Echinoderms).
Symmetry in Echinodermata
- Echinoderms display radial symmetry, allowing division into identical halves through multiple planes.
- Coelenterates, ctenophores, and echinoderms exhibit radial symmetry.
- Bilateral symmetry occurs in organisms like annelids and arthropods, where division into identical left and right halves is only possible in one plane.
Diploblastic and Triploblastic Organization
- Diploblastic animals have two embryonic layers: ectoderm and endoderm, with mesoglea in between; an example is Coelenterates.
- Triploblastic animals develop a third germinal layer (mesoderm) in addition to ectoderm and endoderm, including Platyhelminthes to Chordates.
Coelom Classification
- Coelom is a body cavity lined by mesoderm, distinguishing coelomates.
- Coelomates include Annelids, Molluscs, Arthropods, Echinoderms, Hemichordates, and Chordates.
- The presence or absence of a body cavity is essential for classification in the Animal Kingdom.
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Description
Test your knowledge on the classification of animal body cavities. Learn about coelomates, pseudocoelomates, and acoelomates with diagrammatic sectional views. Explore examples like aschelminthes and platyhelminthes.
