Sea urchins are members of the phylum Echinodermata, which also includes starfish, sea cucumbers, sand dollars, brittle stars, and crinoids. Like other echinoderms, they have five-fold symmetry (called pentamerism) and move by means of …

The meaning of URCHIN is hedgehog. How to use urchin in a sentence.

Jan 9, 2025 · 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 11, 2025 · Sea urchins, or simply urchins, are globular echinoderms of the phylum Echinodermata (consisting of starfish, sea cucumbers, sand dollars, brittle stars, and crinoids), forming the class Echinoidea. These animals begin their life as bilaterally symmetrical larvae but develop into adults with pentamerous or five-fold symmetry.

Sea urchins belong to a group of marine invertebrates called Echinodermata, which means spiky-skinned. Animals in this group are known as echinoderms and include sea cucumbers, sea lilies, brittle stars and starfish, otherwise known as sea stars. …

These spiky little sea creatures are incredibly common throughout the world. They are slow moving creatures, which are commonly found in the intertidal zones of rocky shorelines. Sea urchins have a number of surprising traits to help keep them alive. Read on …

Apr 16, 2024 · Sea urchins are typically viewed as spiky, black, spherical creatures. However, many may be surprised to discover this animal group's immense variety. Characterized by vibrant hues, differing spike lengths, and even flattened shapes, this diversified group of marine animals offers much to explore.

May 27, 2024 · A sea urchin is a small marine animal in the Echinodermata phylum that is spherical in shape and covered in spines or cilia. There are 950 species of sea urchins. Some are irregular, meaning their appearance or anatomy varies from the majority of the species.

Oct 24, 2020 · Urchins are fascinating animals that play a significant ecological role in the ecosystems in which they live. Their unique and complex developmental properties as well as their longevity make them of particular interest to human researchers as well.

Sea urchins are small, spiky creatures found in various habitats, from shallow coral reefs to deep-sea trenches, and they play important roles in the ecosystems in which they live. Approximately 950 species of these creatures live on the seabed of …