![]() Interestingly, the word “Arthropoda” means “jointed foot,” describing animals’ appendages such as claws, legs, antennae, and pincers.Ĭrustaceans include animals like crabs, shrimp, crayfish, pill bugs, barnacles, krill, remipedes, isopods, and more. It contains more than a million different species of arthropods, making them the largest group of animals. Phylum Crustacea is actually a subphylum of phylum Arthropoda. They don’t have heads or brains, but they have nerve rings and cells that respond to light.Īll echinoderms live in the marine waters and cannot survive in freshwater or on land. They characterize not only by their spiny skin but also by the radial symmetry that allows them to sense food and predators. ![]() Echinoderms include animals like sea stars, sand dollars, sea urchins, brittle stars, sea cucumbers, and crinoids. Interestingly, the word “echinoderms” in Greek means “spiny skin,” describing animals’ bodies covered in thin spines. Phylum Echinodermata (or Echinoderms) is a phylum that contains about 7,000 species. Furthermore, I’ll explain the main differences between them, so you’ll notice the significant difference between starfish and the crustaceans. Below I’ll explain more about each phylum, which in biology is a classification level just below the kingdom. However, this certainly doesn’t tell the whole story. There are many differences between them, such as their body symmetry, skeleton, feet, eating habits, breathing, circulatory system, and more. Starfish is not a crustacean but an Echinoderm, belonging to the phylum Echinodermata. But do you wonder what animals they are and if they’re crustaceans? In this post, we’ll talk all about that but let’s start with a quick answer: Starfish are fascinating marine that we often call starfish, but they’re actually not fish, and for that reason, scientists prefer to call them sea stars.
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