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Learn about sea urchins, spiny, globular animals that belong to the class Echinoidea. Find out their diversity, anatomy, ecology, evolution, and cultural significance.
Learn the origin, synonyms, and usage of the word urchin, which can mean a hedgehog, a sea creature, or a mischievous child. See examples of urchin in sentences and related words and phrases.
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). The pores accommodate tube feet, which are slender, extensible, and often sucker-tipped.
Learn about 15 different types of sea urchins, their habitats, diets, and characteristics. See photos and facts of red, green, purple, black, jewel, and variegated sea urchins.
Learn about the diverse and fascinating world of sea urchins, spiky creatures that belong to the group of marine invertebrates called echinoderms. Discover their body structure, diet, reproduction, venom and more.
Sea Urchin Care. The level of care depends on the species, but in a tank with stable temperature, salt, and pH, sea urchins should be relatively easy to maintain. The slate pencil urchin will feed on algae in the tank, and virtually care for itself. Make sure to research if other fish in your aquarium will attempt to eat the urchin.
Large sea urchin (Echinus esculentus)Also known as the European edible hedgehog, this species is found along the entire coast of Europe.Generally, they can reach depths of over 1,000 meters and inhabit areas with hard and rocky substrates. Their diameter varies between 10 to 17 cm and they have fairly short spines with purple tips.The rest of the body has a striking red color, although it can ...
Learn about the unique features and organs of sea urchins, such as their water system, Aristotle's lantern, and tube feet. See illustrations and labels of sea urchin parts and their functions.
Learn about the sea urchin, a spiny, round, marine invertebrate of the class Echinoidea. Find out its description, distribution, diet, predators, reproduction, conservation status, and fun facts.
urchin, any of several marine invertebrates of the class Echinoidea (phylum Echinodermata), including the cake urchin, heart urchin, and sea urchin (qq.v.). This article was most recently revised and updated by