· Jacob Klein introduced the term echinoderm ( echinos = spine; derma = skin) meaning spiny-skinned invertebrates. · Frey and Leuckart kept these animals in a separate phylum, the Echinodermata. VVI Examples of Phylum Echinodermata for Entrance Exams are: Antedon (Sea lily) Neometra (Feather star) Asterias (Starfish) Asterinia Pentacerous Ophiothrix (Brittle star) Ophioderma Gorgonocephalus (Basket star) Echinus (Sea–urchin) Arbacia Clypeaster (Sand dollar) Echinocardium (Heart urchin) Holothuria (Sea-cucumber) Cucumaria Thyone Characteristics of Phylum Echinodermata · Habitat: Exclusively marine , pelagic, or sessile. · Triploblastic , organ-system level of body organization, deuterostomes, tube within a tube body plan. A. Body form · Body is of various shapes like globular, star-shaped, spherical, elongated, and flattened. · Larva: bilaterally symmetrical, · Adult : pentamerous and radially symmetrical. (...