Also known as synapsid, synapsids
Synapsida is a diverse group of tetrapod vertebrates that includes all mammals and their extinct relatives. It is one of the two major clades of the group Amniota, the other being the more diverse group Sauropsida (which includes all extant reptiles and, therefore, birds). Unlike other amniotes, synapsids have a single temporal fenestra, an opening low in the skull roof behind each eye socket, leaving a bony arch beneath each; this accounts for the name "synapsid". The distinctive temporal fenestra developed about 318 million years ago during the Late Carboniferous period, when synapsids
Synapsida is a major group of vertebrates that includes all living mammals and their extinct relatives, and it's distinguished by a unique skull feature—a single opening behind each eye socket that separates synapsids from other major amniote groups like reptiles and birds. Understanding synapsids matters because it helps us trace the evolutionary history of mammals and reveals how a group of ancient tetrapods developed the distinctive anatomical features that would eventually lead to modern mammals.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).