• Sea urchin - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Sea_urchin Sea urchins are members of the phylum Echinodermata, which also includes sea stars, sea cucumbers, brittle stars, and crinoids. Like other echinoderms, they have five ...
  • Sea Urchin Photos -- National Geographic

    ocean.nationalgeographic.com/ocean/photos/sea-urchins See photos of sea urchins (including fire urchins, pencil-spined urchins, and more) in this oceans life photo gallery from National Geographic.
  • Are Sea Urchin Spines Venomous? Yup! And It's a Pretty Cool ...

    scuba.about.com/od/aquaticlifetoavoid/p/SeaUrchins.htm Don’t worry, a rabid sea urchin is not going to leap off the reef and fling spines at you. Sea urchins are non-aggressive and relatively slow-moving.
    • Sea Urchin (Echinoidea) - Animals - A-Z Animals - Animal ...

      a-z-animals.com/animals/sea-urchin The sea urchin in found across the ocean floors worldwide, but rarely in the colder, polar regions. Sea urchins are commonly found along the rocky ocean floor in both ...
    • Sea urchin - New World Encyclopedia

      www.newworldencyclopedia.org/entry/Sea_urchin Sea urchin is the common name for various spiky echinoderms within the class Echinoidea, characterized by pentamerous radial symmetry; a hard calcareous shell, or ...
    • Sea Urchin- Enchanted Learning Software

      www.enchantedlearning.com/subjects/invertebrates/echinoderm/Seaurchin.shtml The sea urchin is a spiny, hard-shelled animal that lives on the rocky seafloor, from shallow waters to great depths. These globular marine invertebrates move very ...
    • Sea Urchin

      www.tolweb.org/treehouses A sea urchin, bottom side up, found in Croatia. There are more than 700 different species of sea urchins.
    • Sea Urchin Editions

      www.sea-urchin.net Yannis Livadas (1969) is a Greek experimental poet, writer, jazz scholar and translator who lives in Paris, France. His translations from English into Greek include ...
    • Sea urchin - Simple English Wikipedia, the free encyclopedia

      simple.wikipedia.org/wiki/Sea_urchin Sea urchins are the Class Echinoidea of the Phylum Echinodermata. Like the rest of the Echinoderms, literally "spike-skinned", they are entirely marine.
    • Invertebrates of Interest: Sea Urchin

      www.wildlife.ca.gov/Conservation/Marine/Invertebrates/Sea-Urchin California's coastal waters are home to a multitude of invertebrates (species lacking a bony skeleton). A small fraction of these, including the red sea urchin and ...