Echinodermata Meaning: Definition and Examples
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echinodermata
[ˌɛkɪnəˈdɜrmətə ]
Definition
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.
Interesting Facts
Biology
- Echinoderms are known for their ability to regenerate lost arms and body parts.
- They possess a water vascular system, which helps them move and grab food using tube feet.
- Most species have radial symmetry, typically displaying five limbs arranged around a central disk.
Ecological Impact
- Echinoderms play a crucial role in marine ecosystems, such as controlling algae growth and serving as prey for various animals.
- Sea stars can impact coral reefs by controlling bivalve populations, enhancing biodiversity.
Cultural Representation
- Starfish, a type of echinoderm, are often featured in art, symbolizing beauty and resilience.
- In some cultures, sea urchins are considered a delicacy, especially in Japanese cuisine as 'uni'.
Evolution
- Echinoderms are believed to have a common ancestor with other marine animals like chordates over 500 million years ago.
- They are part of the deuterostome group, which also includes vertebrates, highlighting their evolutionary significance.
Origin of 'echinodermata'
Main points about word origin
- The name comes from Greek words: 'echinos' meaning 'spiny', and 'derma' meaning 'skin'.
- First used in scientific literature in the 19th century to categorize these unique marine animals.
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.