Marine animals with radial symmetry as adults and a water vascular system, like starfish.
Phylum Echinodermata. Water vascular system with tube feet, dermal endoskeleton of ossicles, five-part radial symmetry in adults and bilateral larvae, deuterostomes. Can regenerate arms.
Tube feet allow movement and feeding. The skeleton comprises ossicles. Larvae are bilateral. They have no brain.
Example: starfish evert their stomach to digest prey.
Marine animals with radial symmetry as adults and a water vascular system, like starfish.
Echinoderms is one of the 53 topics in Zoology & Animal Diversity. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Animal Symmetry, Annelids, Arthropods.
Sea stars pry open clams using tube feet.
Echinoderms is a Beginner topic, so no earlier topic is required. Other Beginner topics in Zoology & Animal Diversity that pair well with it include Animal Kingdom, Vertebrates and Invertebrates, Sponges.
The closest topics to Echinoderms are Animal Symmetry, Annelids, Arthropods, Flatworms. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Echinoderms. To practise the whole of Zoology & Animal Diversity, use the Zoology & Animal Diversity quiz.
Echinoderms: Marine animals with radial symmetry as adults and a water vascular system, like starfish. Animal Symmetry: Animals show radial, bilateral or no symmetry, which relates to their lifestyle and movement. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Animal Symmetry and explain the difference aloud. Finally, take the Zoology & Animal Diversity quiz and come back to this page for any question you miss.
Animals show radial, bilateral or no symmetry, which relates to their lifestyle and movement.
🦁 Zoology & Animal DiversitySegmented worms like earthworms and leeches with a closed circulatory system.
🦁 Zoology & Animal DiversityAnimals with jointed legs, exoskeleton and segmented bodies, the largest animal phylum.
🦁 Zoology & Animal DiversitySoft-bodied, bilaterally symmetric worms with no body cavity, including tapeworms and flukes.
🦁 Zoology & Animal Diversity