23 terms

Week 15_Mammal Specializations

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Teeth
Incisors, Canines, premolars, Molars
Tribosphenic molars
Three cuspid shape with two important features allow for mastication and production of the food bolus
protocone
extended portion of the upper molars
trigonid
Sheering end of lower molars
Talonid
crushing end of lower molars
Hypsodonty
crowns extend into depth of jaw one and slowly move upwards as chewing erodes them
Hypselodonty
roots do not close, tooth is evergrowing
Molar Progression
Molars grow sideways and push front molars out
Placenta
organ that connects the developing fetus to the uterine wall
Endometrium
uterine wall
Choriovitelline placenta
from yolk sac
Chorioallantoic placenta
from chorion and allontois
Pseudovaginal canal
used for birth, separated from vagina
Perineum
In females, the area between the anus and the vagina
Altricial
offspring that is immobile and requires a lot of care at birth
precocial
offspring that is mobile at birth and requires little to no care
Embryonic Diapause
allows mating and birth to be separated and occur at optimal times in the year
Fused uterus
one uterus
Bipartite Uterus
uterus with two parts
Axial Swimming
dorsoventral flexation of body
Echolocation
use of echos from self made ultrasonic signals for navigation and prey detection
The melon
lipid filled area in forehead -> acts as an acoustic lens focusing ultrasounds
Doppler Shift
Change in relative velocities depending on how you're moving and how the objects moving