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Definition of Echinoderms
Echinoderms are derived from the Greek word meaning spiny skin. Phylum Echinoderms, this group of animals are found in almost all depths of the ocean. Echinoderms are the largest phylum of limbless animals that live in fresh water or on land.
Echinoderms have spiny skin, radial symmetry, and move slowly with the help of tube feet. In the ecosystem, echinoderms function as scavengers.
Characteristics of echinoderms
Below are some of the characteristics of echinoderms, including:
- The body of echinoderms consists of three layers and has a body cavity or is called a triploblastic coelomate.
- The body shape is bilaterally symmetrical when still a larva, and as an adult the body shape is radially symmetrical.
- The skin of the body consists of chitin substances.
- have an ambulacral
- It has a perfect digestive system except for starfish which do not have an anus.
- It has no excretory system.
- Reproduction takes place sexually.
Body Structure of Echinoderms
The body shape of echinoderms is generally star-shaped, round, flat, elongated, and plant-like. The body consists of an oral (having a mouth) and an aboral (having no mouth).
The body surface of echinoderms is usually spiny, either short and blunt or long and spiny. Echinoderms do not have a brain. Echinoderms have Ambulacral which is responsible for managing movement.
Classification of echinoderms
Below are various classifications of echinoderms, including:
The shape of the body is like a star, the lower part is called the oral surface and the upper part is called the adoral surface. The mouth of the starfish is on the oral surface.
Examples of Asteroidea, namely Asteria forbesi (starfish), Linkia laevigata (blue starfish), and Pentaceros (horned starfish).
It has five arms and moves like a snake. It does not have tube feet or an anus. An example of Ophiuroidea, namely Ophiothrix.
Their life is attached to the substrate in the sea. Examples of Crinoidea, namely Antedon sp and Holopus sp.
It has five rows of tube (ambulacral) legs. The body is round and covered with spines. Not weapons.
Examples of Echinoidea, namely sea urchins (Diadema) and sea urchins (Echinus).
It is spineless and has five rows of tube feet. Examples of the Holothuroidea, namely Holothuria or sea cucumbers.
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