Definition

Noun: - Order Monotremata: A biological order of egg-laying mammals, coextensive with the subclass Prototheria. This order is characterized by primitive, reptilian-like features such as laying eggs instead of giving birth to live young.

Usage

• The Order Monotremata represents a unique and ancient lineage of mammals.
• Scientists study the Order Monotremata to understand early mammalian evolution.
• The platypus and echidna are the only living members of the Order Monotremata.

Advanced Usage

• In taxonomic classification, Order Monotremata sits alongside Theria (marsupials and placentals) within the class Mammalia.
• The defining characteristics of Order Monotremata include a cloaca and the presence of electroreceptors in the platypus bill.

Variants and Related Words

• Monotreme (n): A common name for any mammal belonging to the Order Monotremata.
  • The platypus is a well-known monotreme.
• Prototherian (adj/n): Relating to or a member of the subclass Prototheria, synonymous with Monotremata.
  • Prototherian reproduction is distinct from other mammals.

Synonyms

• Egg-laying mammals: A descriptive synonym for the members of this order.

Noun

1. coextensive with the subclass Prototheria