Mammals week 9 Flashcards
How many molars does marsupials have
4
What does syndactyly tells us evolutionary history of the groups of marsupials mammals where it occurs
Their ancestors were aboreal
Which of these options is a key difference between the Yinpterochiroptera and the Yangochirotera?
Yin.. echolocate with sounds produces through the nose
Yan.. echolocate with sounds produces through the mouth
What other substances do modified sweat glands produce in modern mammals.
Cooling, Signalling (smell), Sunscreen
Which other group of mammals are close relatives of the order Sirenia (manatees and dugongs)
Elephants and hyraxes
What is true for most members of the Perissidactyla (odd toed - hoffed mammals)
Digest plant in their intestines.
Long gestation period and a small litter size. Mostly just one young.
What is true of extant montremes
Four-chambered hearts.
How many vaginas does female have and how mange branches does a penis have
3 for female and 2 for male
Where did marsupials mammals originate
North America (Laurasia)
How many pairs of molars does placental mammals have?
three pairs of molars and four pairs of premolars.
What does all mammals have
A diaphragm
Which groups belong to Afrotheria
Proboscidea (elephants)
Sirenia (manatee, dugong)
Hyracoidea (hyrax)
etc
Africa
What are most Afrosiricida
Nocturnal and have poor eyesight. Can also detect small vibrations in the ground.
What is special with Hyraxes (hyracoidea)
Poor internal thermoregulation.
Which order belongs to Xenarthra
Xenarthra. Sloths, armadillos etc. Females have a divided uterus.
South America
