Lecture Flashcards
Max dentition for placental mammals
3143/3143
Max dentition for marsupials
5134/4134
Characteristics of Monotremes
Lays eggs, fur, have cloaca as only orifice
Characteristics of Marsupials
2 vaginas, lays eggs, also has a placenta
What is a lazarus taxon
species lost in the fossil record and rediscovered
Heterodonty
Having different morphology in teeth- cetaceans are exception in mammals
Diphyodonty
having 2 sets of teeth milk teeth and adult teeth
Skull age: Juvenile
Has at least one milk/deciduous tooth
Skull age: Sub-adult
Post cranium has not completely fused together
Skull age: Adult
Bones have fused completely, no deciduous teeth left
What clade did all mammals come from?
Synapsids; group has single hole into cranium
What is the common accepted theory of how humans entered the Americas?
During the ice age with lowered ocean levels, the bering land strip was created and they traveled across there to radiate over the continent
What are the three muscles of mastication
Temporalis, Lateral and Medial pterygoid
What is the Atlas
Neck vertebrae
Where do the ribs attach
thoracic vertebrae
What is the lower back
lumbar vertebrae
What bone type makes up the tail
caudal vertebrae
Where does the humerus connect?
Pectoral girdle
Where does the femur connect?
Pelvic girdle
What is the baculum and who has it
The penis bone; Primates, Rodents, Insectivores, Chiropterans, Carnivorans, Colugos
What is determinate growth and what are the terms?
When long bones grow in sections until they fuse and can no longer grow at adulthood. Epiphysis=the ends of the long bone, Diaphysis=the long middle portion
Plantigrade
Ankle or wrist is in contact with the ground
Digitigrade
Podials off the ground, weight of movement is on the distal phalanges
Unguligrade
Ends of distal phalanges on the ground, (ie hooves)
