Classes of Echinoderms. Echinoderms are triploblastic, coelomate animals with radial symmetry and spiny skin. All the animals in Phylum Echinodermata exhibit spiny skin and hence are grouped together. The examples of class Asteroidea is star fish, Ophiuroidea is brittle - star, Echinoidea is sea - urchin and Holothurion is sea- cucumber.. Larval forms are Bipinnaria and Brachiolaria. There are six classes of which three are more prominent. Source | Credits | Picture Credits: NCERT General Science Basis for Animal Kingdom Classification Classification of Animal Kingdom is based on various fundamental features like - Levels of Organisation, Symmetry, … The name actually means spiny skin! Start studying Five Classes of Echinoderms. There are many kinds of mollusks but the four main classes are the class Bivalvia, the class Polyplacophora, the class Gastropoda, and the class Cephalopoda. Respiratory organs in Echinodermata are dermal branchiae, genital bursae, peristomial gills, cloacal trees and tube feet. Asteroidea (Gk. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature for algae, fungi, and … bilateral symmetry, triploblastic and jointed limbs are common Arthropoda Characteristics. They possess compact skeleton and movable spines. Classes of Echinoderms. Phylum ECHINODERMATA. They possess a water vascular system with tube feet which are used for locomotion and food capturing. Next. We’ll discuss what an echinoderm is, examine what their defining features are, and go over some examples of the five classes that make up the phylum Echinodermata. Examples: Class 5 Amphineura. Echinodermata have a world-wide distribution and the phylum contains some 5,300 known species and a large number of fossil forms. This phylum is divided into five extant classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies or feather stars), and Holothuroidea (sea cucumbers) (Figure 2). they belong to phylum Arthropoda and nearly found in every habitat of the biosphere. The phylum echinoderms is divided into five extant classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies or feather stars), and Holothuroidea (sea cucumbers). Examples of animals in the phylum Mollusca. Class 1. Images licensed under CC0. Classification of Phylum Mollusca. spiders, insects, centipedes, millipedes are general common examples. In biology, a phylum (/ ˈ f aɪ l əm /; plural: phyla) is a level of classification or taxonomic rank below kingdom and above class. Examples: Echinus (Sea … CLASSIFICATION OF ECHINODERMATA.

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