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Modern mammals

Characteristics of modern mammals

part of bodycharacterisitics
trends in organization from mammal-like amniotes to mammal enlargement temporal opening skull, dentary bone enlarged, maxillary & palatine bones extended medially & posteriorly, change 1 occipital condyle to 2, homodont to strong heterodont, limbs beneath body, recuction in # carpal & tarsal bones
skeletal single dentary bone with dentary-squamosal articulation, 3 ossicles in middle ear, 2 occipital condyles
soft tissue hair/fur, 4-chambered heart with functional left aortic arch (birds right aortic arch, reptiles both), muscular diaphragm, females with mammary glands (lactogenic), enucleate red blood cells (no nucleus= better O2 capacity)
not unique to mammals or exceptions exist Corpus collosum (connects 2 hemispheres of brain- not in monotremes/marsupials), Placenta (Eutherians, not marsupials), homeothermy (birds, and uncertain in some mammals)
Created by: jebeard