https://en.wikipedia.org/wiki/Echinoderm
Echinoderms are deuterostomal animals with radial symmetry and a calcareous endoskeleton. They include starfish, sea urchins, sea cucumbers and others, and have a diverse fossil and living history.

https://www.britannica.com/animal/echinoderm
Echinoderms are marine invertebrates with a hard, spiny covering or skin. They include sea lilies, sea urchins, sea cucumbers, starfishes, and more. Learn about their diversity, evolution, and fossil history.

https://biologydictionary.net/echinoderm/
Learn about echinoderms, a group of marine animals with radial symmetry, calcareous endoskeleton, and water vascular system. Find out how they reproduce, feed, and move, and see examples of sea stars, sea urchins, and sea cucumbers.

https://echinotol.ucsd.edu/about-echinoderms/
Learn about the diversity, evolution, and development of echinoderms, a group of exclusively marine animals with a rich fossil record. Explore the five living groups of echinoderms and their distinctive body plans, larval ecologies, and metamorphosis.

https://bio.libretexts.org/Courses/Lumen_Learning/Fundamentals_of_Biology_I_(Lumen)/14%3A_Module_11-_Invertebrates/14.13%3A_Phylum_Echinodermata
Learn about echinoderms, a group of about 7,000 marine animals with spiny skin and pentaradial symmetry. Discover their unique water vascular system, nervous system, excretory system, and reproductive modes, and the five classes of echinoderms.

https://www.britannica.com/summary/echinoderm
Echinoderms are marine invertebrates with a hard spiny covering, a calcite skeleton, and five-rayed radial symmetry. They include starfishes, sea urchins, sea cucumbers, and more. Learn about their species, distribution, and adaptations.

http://oceanicresearch.org/education/wonders/echinoderm.html
The phylum Echinodermata , which contains about 7,000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water. All echinoderms have one thing in common: radial symmetry.

https://www.britannica.com/animal/echinoderm/Paleontology-and-evolution
Learn about the diversity, history, and classification of echinoderms, a group of marine invertebrates with a five-part body symmetry and a calcite skeleton. Explore the fossil record of extinct echinoderms and their relationships with living classes.

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_(Boundless)/28%3A_Invertebrates/28.05%3A_Superphylum_Deuterostomia/28.5A%3A_Phylum_Echinodermata
This phylum is a collection of about 7,000 described living species. Echinodermata are exclusively marine organisms. Sea stars, sea cucumbers, sea urchins, sand dollars, and brittle stars are all examples of echinoderms. To date, no freshwater or terrestrial echinoderms are known. Figure 28.5A. 1 28.5 A. 1: Sea stars: Star stars are among the

https://bio.libretexts.org/Courses/Saint_Mary's_College_Notre_Dame_IN/Foundations_of_Form_and_Function/04%3A_Intro_to_Animals/4.07%3A_Echinoderms
Echinoderms are marine animals with spiny skin and pentaradial symmetry. They have a unique water vascular system, a simple nervous system, and can reproduce sexually or asexually. Learn about the five classes of echinoderms and their diversity.

https://www.marinebio.org/creatures/marine-invertebrates/echinoderms/
Echinoderms are a diverse group of marine animals belonging to the phylum Echinodermata. They are characterized by a unique radial symmetry and a spiny or.

https://manoa.hawaii.edu/exploringourfluidearth/biological/invertebrates/phylum-echinodermata
The water vascular system is a complex series of canals running through an echinoderm's body (Fig. 3.84). It is a hydraulic pressure system that aids in movement. The canals are water-filled tubes that open to the outside through a skeletal plate called the madreporite (from Latin root words madre meaning mother and pori meaning small hole) lying on the surface near the anal opening.

https://www.animalwised.com/what-are-echinoderms-4591.html
Echinoderms are a diverse group of marine animals that includes several 5 types of organisms, including: Asteroidea: sea stars (also known as starfish) Ophiuroidea: brittle stars. Echinoidea: sea urchins. Holothuroidea: sea cucumbers. Crinoidea: crinoids. Each of these groups of echinoderms has certain physical characteristics and behaviors

https://www.thoughtco.com/echinoderm-phylum-profile-2291838
Learn about echinoderms, a group of marine invertebrates with spiny skins and radial symmetry. Find out how they reproduce, feed, and impact humans and the ocean ecosystem.

https://www.activewild.com/echinoderms-examples/
Learn about echinoderms, a group of marine animals with radial symmetry, water vascular system, and tube feet. See examples of starfish, sea urchins, sand dollars, sea cucumbers, brittle stars, sea lilies and feather stars.

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Concepts_in_Biology_(OpenStax)/15%3A_Diversity_of_Animals/15.05%3A_Echinoderms_and_Chordates
Adult echinoderms exhibit pentaradial symmetry and have a calcareous endoskeleton made of ossicles (Figure 15.5.1 15.5. 1 ), although the early larval stages of all echinoderms have bilateral symmetry. The endoskeleton is developed by epidermal cells, which may also possess pigment cells, giving vivid colors to these animals, as well as cells

https://wildlifeinformer.com/examples-of-echinoderms/
Learn what echinoderms are and see photos of 12 different types of these marine invertebrates that don't have brains. Discover their unique features, habitats, and diets, from starfish to sea cucumbers.

https://www.amnh.org/explore/ology/biodiversity/tree-of-life2/echinoderms
Here are just SOME of the world's echinoderms: chocolate chip sea cucumber. SCIENTIFIC NAME: Isostichopus badionotus. sand dollar. SCIENTIFIC NAME: Dendraster excentricus. bat star. SCIENTIFIC NAME:

https://simple.wikipedia.org/wiki/Echinoderm
In contrast, echinoderm larvae are planktonic, and have bilateral symmetry. p119 Echinoderm larvae are ciliated free-swimming organisms that have a bilaterally symmetry rather like embryonic chordates. The first stage in all groups except the crinoids is the dipleurula, which has a row of cilia winding round its body. All the groups have second

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_Introductory_Biology_(CK-12)/11%3A_Invertebrates/11.12%3A_Echinoderms
Learn about the phylum Echinodermata, which includes starfish, sea urchins, sea cucumbers, and sand dollars. Find out how they are classified, what they look like, and how they feed and reproduce.

https://byjus.com/biology/echinodermata/
Learn about the phylum Echinodermata, which consists of exclusively marine animals with spiny skins and star-like shapes. Find out the features, organ systems, and examples of the five classes of Echinoderms: Asteroidea, Ophiuroidea, Echinoidea, Holothuroidea, and Crinoidea.

https://www.merriam-webster.com/dictionary/echinoderm
Learn what an echinoderm is, a type of marine animal with a radially symmetrical body and a calcium-containing skeleton. See examples of echinoderms, such as starfishes and sea urchins, and their etymology and history.

https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_(Boundless)/28%3A_Invertebrates/28.05%3A_Superphylum_Deuterostomia/28.5B%3A_Classes_of_Echinoderms
Learning Objectives. The phylum echinoderms is divided into five extant classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies or feather stars), and Holothuroidea (sea cucumbers). The most well-known echinoderms are members of class Asteroidea, or sea stars.