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Noun: subclass Prototheria
  1. Echidnas; platypus
    - Prototheria

Type of: class

Part of: class Mammalia, Mammalia

Nearest

subclass Lepidosauria
subclass Liliidae
subclass Magnoliidae
subclass Malacostraca
subclass Metatheria
subclass Ophiurida
subclass Opisthobranchia
subclass Ostracoda
subclass Pantotheria
subclass Phytomastigina
subclass Prototheria
subclass Rhizopoda
subclass Rosidae
subclass Selachii
subclass Synapsida
subclass Teleostei
subclass Telosporidia
subclass Zoomastigina
subclavian
subclavian artery
subclavian vein