Mammal Lab Flashcards
how are synapsids defined?
- the mammals fall into this group
- have one postorbital fenestra
in species where the postorbital bar is not present, there is a…
postorbital process
what does the postorbital fenestra allow for?
- a strong bite bc of muscle attachment
2. fine movement of the jaw
Important terms for the skull and their relevance:
- interparietal process
- sagittal crest
- postorbital process (know where it is)
- postorbital bar (know where it is)
- intraorbital foramen
- squamosal
- jugal
- zygomatic arch
- auditory bullae
- the interparietal process and sagittal crest are raised areas where the skull halves meet, which allows for the attachment of muscles
- the infraorbital foramen is a hole underneath the eye which allows nerves to run through it. It was originally important for sucking bc it allowed for fine-scale movement of facial muscles, however it inadvertantly became important for nonverbal communication and for whiskers (vivrissae) to pass through.
- the squamosal and jugal meet up to form the zygomatic arch, aka our cheekbones!
- the auditory bullae are associated with the inner ear and function to help us hear better
proper name for whiskers
vivrissae
why is teeth specialization important to mammals?
because we are warmblooded, we have to constantly regulate our metabolism which takes a lot of energy. therefore, we need to get the most out of the food we eat.
types of teeth
- Incisors: front-most teeth
- Canines: used to kill prey with puncture wounds
- Molariform teeth: flat with high surface area, whose grooves fit together to effectively mash food.
what is yawning behavior effective for?
detering competition or predators by showing off canines
molariform teeth are most developed in…
onmivores and herbivores
Subclass Theria
mammals with placentas (all the species in this lab)
Order Marsupial (and this labs species)
the marsupials: common opossum
Metatherians
marsupials
Eutheria
traditional “placentals” (all species in this lab except common opposum)
Order Lypothyphla (and this labs families)
the moles and shrews (Talpidae and Soricidae)
Family Talpidae (and this labs species)
moles: eastern mole