Such animals are called “invertebrates” and there are many; around 97% of all animal species are invertebrates. They have skeletons made up of fluids inside of tubes within their bodies. Sea Stars Are Echinoderms . Believe it or not, we at Modern Pest Services, are frequently confronted with this question. What Does This System Do? NO, all invertebrates do not have bones. Essentially this is what we do as humans. Kathi Moore/EyeEm/Getty Images. 9 years ago. I'd imagine most lay people would class them with shellfish ( another term that shouldn't cause any problem ). What is Bipedal running and which Lizards can do this? 13 Answers. The ribs are those series of slender curved bones articulated in pairs to the spine. Because they are not classified as fish, scientists prefer to call starfish "sea stars." A starfish has eyespots that cannot see much in the way of details but can detect light and dark. Join now. How do you write mathematic equation? Starfish Fun Fact: Despite having no bones or brain, they have plenty of other unbelievable features; including complex nervous systems, having the ability to visualize with their arms (each arm has an eyespot which is very sensitive to light) and also their ability to expel their stomach which they use to wrap around their prey and digest it. While it may not look like starfish have eyes, they do, although they're not like our eyes. Some species have a variable number, but always four, five or nine. Organisms like starfish do not have bones or plates. Many special sensors lie on the top of their body that allows them to sense light. To help protect themselves, these incredible invertebrates have evolved several effective defense mechanisms. 1 decade ago. 0 0. Todd. Starfish and purple sea urchin. The backbone we are talking about here in this post is made up of many small bones called vertebrae attached to the ribs. Samir M ♞ Lv 5. 10 Answers . 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