noun
synapsids; theropsids
Modern paleontological term for the group that includes mammals and their extinct relatives. Used in scientific contexts.
単弓類は哺乳類の祖先を含むグループです。
Synapsids are a group that includes the ancestors of mammals.
noun
mammal-like reptiles
Obsolete term formerly used for non-mammalian synapsids. Replaced by '単弓類' in modern taxonomy.
See also: 哺乳類型爬虫類
かつて「哺乳類型爬虫類」と呼ばれたグループは、現在では単弓類に分類されます。
The group once called 'mammal-like reptiles' is now classified as synapsids.
From 単 (single) + 弓 (arch) + 類 (group), referring to the single temporal fenestra (opening) in the skull characteristic of synapsids.