Definition

Noun: 1. A small, unsegmented marine worm: A type of marine invertebrate animal belonging to the phylum Sipuncula, characterized by a lack of body segmentation. 2. Named for its defensive posture: When disturbed or threatened, it retracts its long, feeding organ (the introvert) into its main body, causing its shape to resemble a peanut shell.

Usage Examples

• Noun:
  • The biologist studied the peanut worm burrowed in the sandy seabed.
  • When touched, the peanut worm quickly contracted, living up to its name.

Advanced Usage

• Scientific context: In marine biology and taxonomy, "peanut worm" is the common name for organisms in the phylum Sipuncula. They are studied for their simple body plan and ecological role as detritus feeders.
  • The survey documented several species of peanut worm in the intertidal zone.

Variants and Related Words

• Sipunculid (n): The formal scientific term for a peanut worm.
  • The sipunculid is a common resident of this habitat.
• Sipuncula (n): The name of the phylum to which all peanut worms belong.
  • The phylum Sipuncula contains hundreds of species.

Synonyms

• Sipunculan worm: A more technical synonym.
• (There are no common, non-scientific synonyms for this specific animal.)

Related Phrases

• Burrowing worm: A descriptive phrase highlighting one of its key behaviors, though this applies to many worm species.
  • The burrowing worm was identified as a peanut worm.

Noun

1. small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut