Echinodermata: meaning, definitions and examples
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echinodermata
[ ˌɛkɪnəˈdɜrmətə ]
biological classification
Echinodermata is a phylum of marine animals characterized by their radial symmetry, a calcareous endoskeleton, and a unique water vascular system. This phylum includes starfish, sea urchins, sand dollars, and sea cucumbers. Echinoderms are mostly found on the ocean floor and play significant roles in marine ecosystems.
Synonyms
spiny-skinned animals.
Examples of usage
- The echinodermata exhibit fascinating forms.
- Starfish belong to the echinodermata phylum.
- Marine biologists study echinodermata for their ecological significance.
- The echinodermata have a unique way of locomotion.
- Echinodermata can regenerate lost body parts.
Etymology
The term 'Echinodermata' derives from the Greek words 'echinos,' meaning 'spiny' or 'hedgehog,' and 'derma,' meaning 'skin.' This name references the spiny skin of many members of this phylum. Echinoderms are believed to have first appeared in the Cambrian period, about 500 million years ago, making them one of the oldest living groups of animals. Their unique body plan and symmetry differ from most other animal phyla, as they possess a five-point radial symmetry and a water vascular system that aids in locomotion, feeding, and respiration. Throughout their evolutionary history, echinoderms have adapted to various marine environments, leading to the diverse forms we see today.