Definition

Noun: 1. A marine echinoderm resembling a starfish but having long, slender, flexible, and easily broken arms radiating from a small central disc. Brittle stars are invertebrates found on the sea floor, known for their snake-like arm movements and their ability to detach an arm if caught by a predator (a process called autotomy).

Usage

• As a subject: "The brittle star uses its arms for locomotion and feeding."
• As an object: "Researchers carefully collected the brittle star for study."
• With modifiers: "A large brittle star hid under the coral." / "These deep-sea brittle stars are rarely seen."

Examples

• "Unlike a true starfish, a brittle star moves by quickly writhing its long, thin arms."
• "The tide pool was home to several brittle stars clinging to the underside of a rock."
• "If handled, the arm of a brittle star may break off, which is how it got its common name."

Advanced Usage

• Scientific Context: In taxonomy, brittle stars belong to the class Ophiuroidea. The term is often used in marine biology and ecology texts.
  • Example: "The Ophiuroidea, or brittle stars, are the most diverse group of echinoderms."
• Collective Reference: The term can refer to the class as a whole or to an individual organism.
  • Example: "Brittle stars are important detritivores in many ocean ecosystems."

Variants and Related Words

• Brittlestar (Noun): An alternative, often single-word spelling of "brittle star."
• Ophiuroid (Noun): The formal scientific term for a brittle star.
• Serpent Star (Noun): Another common name for a brittle star, referring to the snake-like movement of its arms.

Synonyms

• Ophiuroid (scientific synonym)
• Serpent star (common-name synonym)

Antonyms

• There is no direct antonym, as it is a specific animal. In a broader echinoderm context, one could contrast it with:
  • True starfish (or sea star), which belongs to a different class (Asteroidea) and has thicker, less flexible arms.

Notes

• The name "brittle star" is a compound noun. The key characteristic described by the word "brittle" is the fragile, easily broken nature of its arms.
• It is important to distinguish brittle stars (Ophiuroidea) from true starfish or sea stars (Asteroidea), as they are different classes of animals with distinct anatomical and behavioral features.

Noun

1. an animal resembling a starfish with fragile whiplike arms radiating from a small central disc