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Comparison between marsupials (metatherians) and placental mammals.

Braincase is small relative to body size. Minimally developed neocortex. No corpus callopsum. Marsupials
Braincase is large relative to body size. Largely developed neocortex. Corpus callopsum present. Eutherians
Auditory bullae (generally) absent. Marsupials
Auditory bullae present. Formed from tympanic bone. Eutherians
Large jugal bone. Jugal and squamosal bones articulate with dentary bones in the mandibular fossa. Marsupials
Jugal bone does not articulate with dentary bones in the mandibular fossa. Eutherians
Angular process inflicted 90 degrees. Marsupials
Dental formula 5/4, 1/1, 3/3, 4/4 = 50. Teeth (mostly) non-deciduous. Marsupials
Dental formula 3/3, 1/1, 4/4, 3/3 = 4. Teeth (excluding molars) deciduous. Eutherians
Epipubic bones occur in both sexes. Marsupials
Scrotum anterior to penis. Baculum not present. Marsupials
Scrotum posterior to penis. Baculum sometimes present. Eutherians
(Often) contains marsupium that encloses teats. Marsupials
Created by: bettafische