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Noun: subclass Synapsida
  1. Extinct reptiles of the Permian to Jurassic considered ancestral to mammals
    - Synapsida

Type of: class

Part of: class Reptilia, Reptilia

Nearest

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
subclinical
subclinical absence
subcommittee
subcompact