mammalogy lab quiz 1

Homodont

1 type of tooth (Sharks, Crocodiles )

Heterodont

more than 1 kind of tooth

Diphyodonty

2 sets of teeth within a lifetime (deciduous/milk teeth & adult teeth)

Hypsodont

high crowned, shallow roots (if any)

Brachyodont

short crowned, deep roots

Incisors, Canines, Premolars, Molars

4 Basic Tooth Types

Zalambdodont

V-Shaped; selenodons

Dilambdodont

W-shaped, most insectivore groups; moles

Selenodont

crescent-shaped ridges, herbivores; artiodactyls

Bunodont

Basic pattern w/ low rounded cusps, omnivores; primates

Lophodont

fused cusps forming long ridges, herbivores; perissodactyls

Loxodont

extreme lophpdonty, washboard; elephants

Carnassial pair

last upper premolar and first lower molar developed to slice meat

Rodent teeth

specialized incisors for gnawing

Cortex

long cells that may have pigment granules

Medulla

weekly arranged cells forming the core of the shaft; pigment masses and air cells

Cuticle

outer sheath of keratinous scales

Crown

Covered in enamel, a layer of hard substance similar to bone.

Dentin

Below the enamel, similar to bone, but not as hard as enamel

Pulp

Dentin surrounds the pulp cavity (filled with pulp)

Cementum

An additional layer of bony material surrounding the root

Differences between marsupials and placentals

Marsupials have large palatine vacuities and angular process inflects medially