Linked from
The 13 pages that link to Mammaliaformes, each with the reason it gives.
SynapsidaBroader topic: Mammaliaforms record the transition from broader synapsids to mammals.
MorganucodonNarrower topic: Morganucodon belongs to this group, broader than crown mammals.
CynodontiaRelated: Advanced cynodonts gave rise to this group near the origin of mammals.
EuharamiyidaNarrower topic: Euharamiyida is placed within this broader group of mammal relatives.