Definition

Proper noun * Kingdom Animalia: The taxonomic kingdom comprising all living or extinct animals. It is one of the major groups in biological classification, encompassing all multicellular, eukaryotic organisms that are typically mobile, heterotrophic (obtaining nutrients by consuming other organisms), and lack cell walls.

Usage

• "Kingdom Animalia" is used in formal scientific contexts, particularly in biology, zoology, and taxonomy, to refer to the entire animal kingdom as a classification category.
• It is often contrasted with other kingdoms such as Plantae (plants), Fungi, and Protista.

Examples

• Biologists study the evolutionary relationships within Kingdom Animalia.
• Sponges, insects, fish, birds, and mammals are all members of Kingdom Animalia.
• The classification system places humans within Kingdom Animalia.

Advanced Usage

• The term is fundamental to the Linnaean taxonomy and modern cladistics. Discussions about phylogeny (evolutionary history) or cladograms (evolutionary trees) frequently reference Kingdom Animalia as a major branch.
• In some modern classification systems, the term Metazoa is used synonymously with Kingdom Animalia.

Variants and Related Words

• Animalia: Often used as a shorthand in scientific literature (e.g., "the diversity of Animalia").
• Animal Kingdom: A common, less formal synonym used in general science education and discourse.
• Metazoa: A technical term essentially equivalent to Kingdom Animalia, emphasizing that its members are multicellular animals.

Synonyms

• Animal Kingdom
• Metazoa (in technical contexts)

Related Phrases

• Kingdom-level classification: Refers to the highest rank in the taxonomic hierarchy, of which Animalia is one.
• Member of Animalia: A phrase used to describe any specific animal species or group (e.g., "A dog is a member of Animalia").

Noun

1. taxonomic kingdom comprising all living or extinct animals