The story of how the starfish got its arms reminds us that even animals that might be familiar to us today can have incredibly deep histories - ones that stretch back almost half a billion years.

Continuing our study of the echinoderms, let's take a look at their body systems, especially the water vascular system and endoskeleton. What else can we say about their general anatomy and physiology? How do sea stars and sea urchins...

This video provides a brief introduction to the characteristics and diversity of echinoderms, such as starfish, sea urchins, and sea cucumbers. This video is part of the 11-part series, Classifying Animals.

Crown-of-thorns starfish are large, spiny, and eat coral reefs and without enough natural predators to control their population, someone had to create one.

This live-action video program is about the word invertebrate. The program is designed to reinforce and support a student's comprehension and retention of the word invertebrate through use of video footage, photographs, diagrams and...

Upon viewing the Simple Animals video series, students will be able to do the following: Differentiate between and provide examples of vertebrate and invertebrate animals. Describe the basic body parts of a sponge (porifera). Explain the...

Featherstar. This marine invertebrate is an ancient and primitive echinoderm, a member of the group of invertebrates that includes the starfish

A starfish clings to a rock on the ocean floor.

Sea urchin macro with ambulacral system searching new things.

Sea urchin macro with ambulacral system searching new things.

Sea urchin macro with ambulacral system searching new things.

CU Crinoid Squat Lobster on moving Crinoid, zoom out to MS, Mabul, Borneo, Malaysia

Urchin crab (Dorippe frascone) carrying a false fire urchin (Astropyga radiata). This crab carries an urchin on its back for protection from predators. Filmed in Lembeh Strait, North Sulawesi, Indonesia

Sea urchin macro in Hawaii Underwater.

Sea urchin in reverse position ambulacral system exposed, with a wave recover natural position and tiny ambulacral feets grab the rock again.

Sea cucumber feeding himself, with vivid colors sure that is a poisonous organism.

Sea cucumber (Holothuroidea) with pink ocelle, walking in the sea bottom, low depth.

Sea urchin moving, Southern Visayas, Philippines

Sea cucumber feeding on seabed, Mabul, Borneo, Malaysia

BCU High angle, Appendages of colourful toxic sea urchin waving, Malaysia

Echinids and calcareous algaes in Hawaiian reef

Blue crab shell on sea urchins, and anemones in Cabo de Gata Natural Reserve. Macro shots of the underwater fauna.

A seagull perched on a rock with a seagull stuffed in its mouth. Shot with a Canon 6D.

Starfish cling to corals.