Definition

1. Noun:
   • A small, translucent, lancet-shaped marine animal that burrows in sand; a primitive chordate considered an evolutionary forerunner of vertebrates.

Usage Examples

• Noun:
  • The amphioxus is often studied in biology classes to understand early chordate evolution.
  • Researchers found several amphioxus specimens in the shallow coastal sands.

Advanced Usage

• "Branchiostoma lanceolatum": This is the scientific genus and species name for the most common type of amphioxus.
  • The amphioxus, scientifically known as Branchiostoma lanceolatum, exhibits key chordate characteristics.

Variants and Related Words

• Lancelet: A common synonym for amphioxus.
  • The lancelet, or amphioxus, lacks a true backbone but has a notochord.
• Cephalochordate: The subphylum to which amphioxus belongs.
  • As a cephalochordate, the amphioxus represents a crucial link in understanding vertebrate ancestry.

Synonyms

• Lancelet: The more frequently used common name.
• Cephalochordate: Refers to any member of the subphylum Cephalochordata, which includes amphioxus.

Related Terms (Not Phrasal Verbs or Idioms)

• Notochord: The flexible rod-like structure found in amphioxus and all chordate embryos.
  • The amphioxus retains its notochord throughout its life.
• Chordate: An animal belonging to the phylum Chordata, characterized by having a notochord at some stage of development.
  • The simple body plan of the amphioxus provides a model for the basic chordate form.

Noun

1. small translucent lancet-shaped burrowing marine animal; primitive forerunner of the vertebrates