Teeth Phylogeny and Diversification

Docodonts

• Jurassic and later

• Mouse-sized

• Drab in color

• very complex tooth structure

Mesozoic groups named after teeth

• Triconodonts

• Docodonts

• Multituberculates

Triconodonts

animals with three cusps teeth

Multituberculates

• rodent-like incisors

• plaigiolacoid lower premolar

Most successful mammalian group in history

Multituberculates

Plaigiolacoid

sideways sheering tooth

Tribosphenic Pattern

teeth with lots of points and ridges

Trigonid

part of tooth that is taller, has points

Talonid

part of tooth that is shallower, makes for occlusion

Root

below gumline

Crown

above gumline

Enamel

layer of strength on surface

Dentine

another layer of strength under enamel

Open-rooted teeth

teeth that grow/fall out and are replaced

Closed-rooted teeth

teeth that grow till fully matured then stay forever

Cementum

Layer the root is covered in

Heterodont Teeth

Incisors, Canines, Premolars, and Molars

Brachyodont

low height above gumline

Hypsodont

high height above gumline

Lophodont

cheek teeth used for grinding

Selenodont

cheek teeth used for browsers

Bonodont

cheek teeth used for omnivores

Ectoloph

cheek teeth used for insectovores

Carnassial

cheek teeth used for carnivores

Diastema

gap between teeth (replaces canines in rodents)

What was George Simpson Know for

he was an architect of New Synthesis

what is New Synthesis

it helped create phylogenetic groups through DNA, but failed to see convergent evolution

What is an important part that drove evolution

Geography

When did Synapsida diverge

about 320 mya

When did Morganucodon diverge

about 210-205 mya

when was the first diversification of marsupials

about 80-90 mya