antennule

A shrimp uses its antennule to sense movement in the water.

Definition

1. Noun:
   • A small antenna: "antennule" refers to a small, often segmented appendage located on the head of certain arthropods, especially crustaceans (such as shrimp, lobsters, and crabs). It is typically smaller and more delicate than the main antenna, serving sensory functions like detecting touch, chemicals, or water currents.

Usage Examples

• (A small appendage used for sensory perception.)
• (The small antenna is lost during the shedding process.)

Advanced Usage

• "to flick the antennule": a common behavior in crustaceans where the antennule is quickly moved to sample chemicals or water flow.

  • The shrimp flicked its antennule to test the water for predators. (It moved its small antenna rapidly for sensory sampling.)

• "antennule morphology": the study of the shape and structure of these appendages, often used in taxonomy to distinguish species.

  • Researchers examined the antennule morphology to identify the crab species. (They studied the small antenna's form for classification.)

Variants and Related Words

• Antenna (n): a larger, more prominent sensory appendage on the head of arthropods.

  • The insect's antenna detected vibrations in the air. (The larger appendage senses environmental stimuli.)

• Antennular (adj): relating to or resembling an antennule.

  • The antennular segment of the shrimp is highly sensitive. (The part associated with the small antenna is sensitive.)

Synonyms

• Small antenna: a direct synonym, though less specific.
• First antenna: in some crustacean anatomy, the antennule is called the "first antenna," while the larger one is the "second antenna."

Phrasal Verbs

Related Idioms