Synapsida

References

Images & Videos

Diagram comparing five types of reptile skulls-synapsid, parapsid, anapsid, euryapsid, diapsid-and a lizard skull, each labeled with bones such as postorbital, squamosal, and postfrontal, highlighting differences in skull openings and structure.

Collage showing a dog plus a saber-toothed cat equaling a prehistoric, quadrupedal creature with thick limbs and dark, hairless skin.

Synapsida: Media

fossil tetrapod subclass

Videos

Collage showing a dog plus a saber-toothed cat equaling a prehistoric, quadrupedal creature with thick limbs and dark, hairless skin.

What came before the dinosaurs?

Humans might be related to these weird, hairless dogs.

Video: Encyclopædia Britannica, Inc.

Images

Diagram comparing five types of reptile skulls-synapsid, parapsid, anapsid, euryapsid, diapsid-and a lizard skull, each labeled with bones such as postorbital, squamosal, and postfrontal, highlighting differences in skull openings and structure.

synapsid and reptilian skull types

Synapsid and reptilian skull types.

Encyclopædia Britannica, Inc.