The Echinoids consist of the sea urchins and sand dollars, with bodies shaped like globes or discs. Characteristically they have a hard shell and spines. Many are herbivores, feeding on algae, but others are predators. Sea urchins move by their podia or tubular feet and also their movable spines and many burrow. Sand dollars also burrow into soft sediments and may bury themselves completely, digging with their movable spines.
More information
More information
Related categories 1
Sites 11
Photographs and information on the heart urchins, sand dollars and sea urchins from the Animal Diversity Web.
Photographic study by Richard Howey with some fine photographs of the intricate beauty of these structures.
Biology, phylogeny, and classification of sea urchins.
Information about sea urchins, such as how they live, feed, and reproduce. There is also an alphabetic listing of their taxa. From The Natural History Museum, London.
Factsheet from the FAO on the Chilean Sea Urchin which is eaten in Chile and Peru, its distinguishing features, distribution, habitat and biology.
Information from Wikipedia on this species, Strongylocentrotus franciscanus, including its description, feeding habits, behavior and reproduction.
Laboratory modules using sea urchin eggs to explore fertilization and development.
Article by Jean-Marie Cavanihac on these animals with many photographs of their development.
Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
Photograph and information on the purple sea urchin.
Illustrated article by Richard L. Howey considering how creatures with no brains, such as the sea urchin, react appropriately to their surroundings.
Biology, phylogeny, and classification of sea urchins.
Photographs and information on the heart urchins, sand dollars and sea urchins from the Animal Diversity Web.
Factsheet from the FAO on the Chilean Sea Urchin which is eaten in Chile and Peru, its distinguishing features, distribution, habitat and biology.
Photograph and information on the purple sea urchin.
Photographic study by Richard Howey with some fine photographs of the intricate beauty of these structures.
Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
Illustrated article by Richard L. Howey considering how creatures with no brains, such as the sea urchin, react appropriately to their surroundings.
Article by Jean-Marie Cavanihac on these animals with many photographs of their development.
Information from Wikipedia on this species, Strongylocentrotus franciscanus, including its description, feeding habits, behavior and reproduction.
Information about sea urchins, such as how they live, feed, and reproduce. There is also an alphabetic listing of their taxa. From The Natural History Museum, London.
Laboratory modules using sea urchin eggs to explore fertilization and development.
