lab 4 Flashcards
what is anapsid?
no holes, jaw muscles connected to skull
what is diaspid?
2 holes (3 hole with eyes), made up of the squamosal, post orbital and parietal bones (jugal instead of partial in lower jaw)
what is synapsid?
1 hole (2 with eyes) with the squamosal, post orbital and jugal bones
what information does temporal fenestration provide?
the jaw strength, more holes allow more muscle connection points
what does homodont mean?
all the teeth are similar shape
what does heterodont mean?
all the teeth are different shape
what is polyphydont?
many replacement teeth
what is edentate?
the skull is apart of the jaw and used teeth
what does tooth uniformity tell you about an animal?
how variable their diet
what is diphydont?
has only 2 sets of teeth their whole lifetime
what are only creatures that are edentate?
turtle and bird
only creature that is diphyodnt?
mammals
what 3 creatures are/can be heterodont?
mammals, some snakes and fish
describe secodont teeth?
pointy and sharp, specially for carnivores
describe the selendont teeth
curved ridges form from to back
describe the lophodont
ridges from cheek to tongue
describe the bunodont
rounded teeth like humans
describe the unspecialized
wilding
how did the jaws evolve in sharks?
whole jaw made from splanchocranium
upper jaw: palatoquadrate (cartilage)
lower jaw: meckel’s cartilage
how did jaws evolve in salmon
jaw is dermal bone:
upper jaw: quadrate bone
lower jaw: articular bone
how did ear evolve?
the stapes, malleus and incus came from the hyomandibula which are the hyoid and the manidubular which are the 1st and 2nd arches
how did jaws evolve in alligators
jaw is dermal bone:
upper jaw: quadrate bone
lower jaw: articular bone
how did jaws evolve in cougars?
jaw is dermal bone
upper jaw: squamosal bone
lower jaw: dentary bone
