20 terms

Week_ Mammal Evolution and Diversity

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Pelycosaurs
1st of 3 mammal radiations
Therapsids
2nd radiation of mammals
Zygomatic arch
Formed form the lower temporal bar that allows for even more room for muscle to close jaw during chewing
Homodont
Pelycosaurs -> same tooth structure
Heterodont
therapods and mammals -> different teeth for different functions
Secondary palate
separates nasal passages from the mouth so you can breath and eat at the same time
Dentary
anterior half of the lower jaw
Postdentary
bones in lower jaw
Squamosal
between parietal bone and temporal bone on side of the skull, bordered in back by occipital bone
Incus
quadrate- inner ear bone Derived from the bones that used to hinge the skull and jaw
Malleous
articular- inner ear bone Derived from the bones that used to hinge the skull and jaw
Stapes
middle ear bone
diphyodonty
Two sets of teeth during the lifetime
Protomammary glands
most likely to keep eggs moist and protect from microorganisms
Apocrine glands
associated with hairs not modified sweat glands
Multituberculates
extinct Alloterin
Monotremes
prototherin
marsupials
matatherin
Placentals
mammals with a placenta
Multicusped teeth
Broad teeth used for grinding