Are jellyfish, squid and starfish categorized of organisms with segmented body?

With over 2 million known animal species on Earth, 98% of them are invertebrates. Invertebrates are animals that don't have backbones. They live in a variety of environments, from hot and unbearable deserts to frigid and equally unbearable polar regions. They also come in an assortment of shapes and colors. To better understand invertebrates, scientists group them into eight major categories.