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Learn about sea urchins, spiny echinoderms that live on the seabed and feed on algae and sessile animals. Find out their diversity, anatomy, evolution, and cultural significance.
Learn about 15 different types of sea urchins, their habitats, diets, and characteristics. See photos and facts of red, green, purple, black, jewel, and other sea urchins.
Sea urchins, or simply urchins, are globular echinoderms that belong to the class Echinoidea. These animals begin their life as bilaterally symmetrical larvae, but most species develop into adults with a five-fold symmetry. Their bodies are encased in a hard shell called the test, which contains numerous spines and pores that allow their tube feet to extend outwards.
Learn about the sea urchin, a spiky ball-shaped animal that lives in various oceans and feeds on algae and other organisms. Discover its adaptations, reproduction, human interaction, and more with photos and interesting facts.
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).
25 Types of sea urchins. Did you know that there are more than 950 species of sea urchin? Sea urchins can be regular or irregular. We look at some of the most common sea urchin varieties in nature.
Sea urchins are globe-shaped creatures that live on the ocean floor. Many beachgoers have had the misfortune to feel a sting from their spines, but how much do you know about the lives of these animals? From a fascinating symmetrical structure to deadly-looking spines, unique mouthparts and clever ...
Learn about sea urchins, small, spiky animals that live in various habitats and play important roles in marine ecosystems. Find out their appearance, diet, reproduction, threats, and more fascinating facts.
Learn about sea urchins, small, spiny animals that live on the ocean floor and have no eyes. Find out their history, classification, diet, predators, and more.
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.