Mammalogy Lab Final Flashcards

Terms Definitions
cristae
crests
Diastema
Wide gap between teeth
Diphyodont
having two sets of teeth
dilambdodont
modified tribosphenic cheek tooth. upper molar has a W-saped occlusaal surface with the protocone near the lingual apex of the trigon. Found in opossums (Didelphidae) and tree shrews (Tupaiidae)
metaconule
commonly developes between the metacone and hypocone on bunodont teeth
paraconule
aka protoconule. commonly developed between the protocone and paracone in bunodont teeth.
euthemorphic
modified tribosphenic cheek tooth, usually with a square or quadrate crown due to an additional cusp (hypocone)
Underhairs
insulation hairs (wool, fur, velli)
Incisors
teeth routed in the premaxillary bone
Molar
Teeth situated posterior to the premolars and never have deciduous predecessors. Usually larger than premolars with more cusps.
hypsodont
teeth with a particularly high crown
ectoloph
series of crests connecting the paracone (and sometimes the metacone) with cusps on the stylar shelf
quadritubercular
euthemorphic upper molar with four main cusps
vibrissae
usually long stiff hairs with well-innervated bases surrounded by many blood vessel. Serve as tactile receptors. Best known as 'whiskers' on face but can also be located on ankles and elsewhere.
commissures
modified tribosphenic teeth found in many bats in which the three cusps elongate into sharp chrescent-shaped cristas useful in cutting.
carnassial
aka secodont dentition. general type of dentition found in mammals who eat flesh
Pulp
The central, living portion of a growing tooth which is connected to blood vessels and nerves
Heterodont
Two or more different kinds of teeth
Root
the portion fitting into the sockets of the jaw
Zalambdodont Upper Molar
characterized by a V-shaped crests
Premolars
teeth situated just posterior to the canines. All placentals in which there are four premolars, the first never has a deciduous precursor.
zygomatic breath
greatest distance between the outer margins of the zygomatic arches
Cheek teeth, postcanine teeth, molariform teeth
Premolars + Molars
hypocone
found in the euthemorphic upper molar, located on the posterior lingual side of the crown.
selenolophodont teeth
aspects of both lophodont and selenodont teeth, found in horses
selenodont
similar to lophodont teeth but each ridge is formed by the elongation of a single cusp. Ridges are always crescent-shaped and longitudinally oriented.
enamel
thin, usually white, hard layer that covers the dentine
Velli
down/fuzz. fine, short hairs that are velvety in
Rooted Teeth
Teeth which are not growing any longer. The blood vessels close off and growth ceases
Deciduous or Milk Teeth
Teeth present in immature mammals
Crown
Portion of the tooth exposed above the gumline
lingual
side of the tooth closest to the tongue
Condylobasal length
from the anterior edge of the premaxillae to the posterior-most projectino of the occipital condyles
least interorbital breadth
least distance dorsally between the orbits
Stylar Shelf
broad ledge situated labial to the paraone and metacone, has several cusps, including the most anterior, the parastyle
cementum
bone like layer covering the root of the tooth
caniniform
last incisor that appears to be the canine tooth, which is actually absent or small (resembling a premolar) Conversely the first premolar can be caninform.
permanent teeth
second set of teeth in diphyodont retained throughout life
Cusps
points and bumps on the crown of the tooth
Occlusal
Surface of a tooth that meets with a tooth on the opposing jaw
labial
side of the tooth closest to the cheek (also:buccal)
carnassial pair
found only in the order Carnivora, the two teeth on each side to do most of the shearing
postorbital constriction
least distance across the top of the skull posterior to the postorbital process
Labial of Buccal Side
side of tooth closest to the cheek.
Four basic types of teeth in mammals
Incisors, canines, premolars, and molars
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