Echinoderms

All echinoderms are marines animals that have spiny skin. Echinoderms undergo metamorphosis from bilateral, free-swimming larva to sessile or sedentary adult. All echinoderms lack segmentation and they breathe through skin gills as an adult. They have a nervous system but they don't have a head or brain in adults. Echinoderms have no circulatory system, respiratory system, or excretory system. Echinoderms can reproduce sexually and asexually. Two examples of scientific names are Charonia tritonis and Periclimenes soror. There are approximately 13,000 species of echinoderms in the world.

These are all different species of echinoderms.