Sea urchins are found in every ocean and in every climate, from the tropics to the polar regions, and inhabit marine benthic (sea bed) habitats, from rocky shores to hadal zone depths. The fossil record of the Echinoids dates from the Ordovician period, some 450 million years ago.

Sea urchin, any of about 950 living species of spiny marine invertebrate animals (class Echinoidea, phylum Echinodermata) with a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton).

Jan 28, 2024 · Sea urchin stings are immediately painful. They often leave puncture wounds on the skin, which can easily become infected if not treated immediately. The stung area may become red and...

Sea urchins are round creatures with a symmetrical skeletal structure. They’re also known for deadly-looking spines. Discover the lives of these amazing animals.

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More than 900 species of sea urchins (or Echinoidea) inhabit the world’s seas and oceans, with variable coloration and shape. They are easily found when snorkeling, moving slowly on the bottom using their tube feet.

Sea urchins are spiky members of the class Echinoidea of the phylum Echinodermata. Like the rest of the echinoderms, they are entirely marine. They are globe-shaped, and protected by calcareous plates and spines. Urchin is an old word for hedgehog, and in many foreign languages these animals are called sea hedgehogs.

Jul 29, 2020 · There are more than 900 species of sea urchins around the world from the shallows to the deep sea. Urchins live at depths of more than 24,000 feet. Hidden beneath their spines they have a hard, outer skeleton called a test.

Sea urchins are echinoderms that are typically spherical or flattened with a covering of spine-like structures. Sea urchins tend to be important members of their ecosystems by grazing on other organisms and stabilizing populations.

Having visited south west Turkey and then the northern Aegean in the Spring and laid up on Evia for the Summer, we are now travelling south through the Cyclades before heading back around the Peloponnesus and then to Malta and Tunisia for the winter. Through the bridge at Chalkida. Get new content delivered directly to your inbox.