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.

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.

Urchin (software), a series of web analytics developed by the Urchin Software Corporation (now Google Analytics) "Urchin" was the code name for the modulated neutron initiator design used in the earliest American implosion atomic bombs; The Urchins, English hooligan firm associated with Liverpool F.C. Urchin Rock, off the coast of Graham Land ...

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. …

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 …

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 …

Aug 22, 2015 · Urchins are part of the phylum Echinoderm and their name comes from Ancient Greek (echinos meaning "hedgehog" and derma meaning "skin"). There are more than 900 species of sea urchins and they come in a range of colors …

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.