Definition

1. Adjective:
   • Having a single shell: Used to describe a mollusk whose body is enclosed by a single, often coiled, shell. This term is primarily used in contrast to bivalves (like clams) which have two shells.
2. Noun:
   • A mollusk with a single shell: An animal, typically a gastropod like a snail, slug, or whelk, that possesses a one-piece shell or, in some cases, a greatly reduced or internal shell.

Usage Examples

• Adjective:
  • The garden snail is a classic example of an univalve mollusk.
  • The fossil record shows both univalve and bivalve specimens from that era.
• Noun:
  • The tide pool was teeming with univalves such as periwinkles and limpets.
  • Marine biologists collected several univalves for their study on shell morphology.

Advanced Usage

• In scientific classification (malacology), the term "univalve" is a descriptive, informal term. The more precise taxonomic group is Gastropoda, which includes all snails and slugs.
• The term can be used descriptively for the shell itself:

Variants and Related Words

• Gastropod (noun): The scientific class name for snails, slugs, and similar mollusks, encompassing all univalves.
• Bivalve (noun/adjective): A mollusk with a two-part hinged shell (e.g., clam, oyster), serving as the direct contrast to a univalve.

Synonyms

• Gastropod (when used as a noun, in a scientific context).
• Single-shelled (when used as an adjective).

Antonyms

• Bivalve (noun/adjective): A mollusk with two shells.

Adjective

1. used of mollusks, especially gastropods, as snails etc.

Noun

1. a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes