Echinodermata
Echinodermata
Echinodermata (pronounced: eh-kih-no-der-muh-tuh) is a phylum of marine animals found at various depths in oceans around the world. The term Echinodermata is derived from the Greek words "echinos," meaning "hedgehog," and "derma," meaning "skin," referring to the spiny skin characteristic of these animals.
Etymology
The term Echinodermata comes from the Greek words "echinos" (hedgehog) and "derma" (skin). This name is a reference to the spiny skin or shell that is a common characteristic of animals in this phylum.
Characteristics
Echinoderms are known for their radial symmetry, a trait they share with cnidarians. However, echinoderms are deuterostomes, a group that also includes chordates, the phylum to which humans belong. Other notable characteristics of echinoderms include a water vascular system that aids in locomotion and feeding, and the ability to regenerate lost body parts.
Classification
The phylum Echinodermata is divided into five extant classes:
- Asteroidea (sea stars or starfish)
- Ophiuroidea (brittle stars)
- Echinoidea (sea urchins and sand dollars)
- Crinoidea (sea lilies and feather stars)
- Holothuroidea (sea cucumbers)
Related Terms
- Deuterostome: A major group of animals defined by the developmental characteristics of its members, which includes echinoderms and chordates.
- Radial Symmetry: The arrangement of body parts in a circle around a central axis, a characteristic feature of echinoderms.
- Water Vascular System: A hydraulic system used by echinoderms for locomotion, food and waste transportation, and respiration.
External links
- Medical encyclopedia article on Echinodermata
- Wikipedia's article - Echinodermata
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