Table 3. Generalized pattern of histological long bone features among major clades of placental mammals.

Histological features	Euarchontoglires	Laurasiatheria	Afrotheria	Xenarthra
Orientation of vascular canals	longitudinal, reticular, radial	circumferential, longitudinal, reticular, radial	circumferential, longitudinal,reticular	longitudinal, reticular, radial
Pattern of vascularization	irregular	irregular or laminar to plexiform	laminar to plexiform	irregular and/or circular
Primary bone	lamellar or woven and parallel-fibered	woven, parallel-fibered andlamellar	woven, parallel-fibered andlamellar	woven, parallel-fibered and lamellar
LAGs	yes	yes	yes	yes
Remodeling	Haversian bone, except in rodents	Haversian bone, except insmall animals	Haversian bone, except insmall animals	Haversian bone

Feature descriptions for Euarchontoglires, Laurasiatheria and Afrotheria were adapted from [5], [22], [24], [25], [72]–[78], [99].