Lab 3 Flashcards
What orders are contained within Monotremata?
Tachyglossidae (echidnas) and Ornithorhynchidae (platypus)
Characteristics of Monotremes
Oviparous Cloaca Mammary glands lack nipples Adults with no teeth lack A.B., jugal, lacrimal
Monotremes are Marsupials share what distinct characteristic?
Epipubic bone
Ornithorhynchidae
- common name?
- characterists?
hair, bill, webbed feet venomous barbs on males electroreceptors in bill no pouch young with 3 molars
Tachyglossidae
- common name?
- characterists?
long “snout” with receptors
hair are spines
large scoop-like claws
barbs on hind legs
Metatherians
- classification?
metatheria = infraclass theria = class class = mammalia
Didelphiorphia
- common name
- classification
- adaptation to arboreal envr?
- diet?
American opossum metatheria - prehensile tail - omnivorous "play possum"
Pacituberculata
shrew opossums
metatheria
Microbiotheria
monito de monte
nocturnal and arboreal
partially prehensile tail
insectivore
dasyuromorphia
- diet
- dentition
- fusion of toes?
tasmanian devil, noombat marsupials
carnivores/scavengers/insectivores
polyprotodont
didactylous
peramelemorphia
diet?
dentition?
fusion?
bandicoots and bilbies
omnivorous
polyprotodont
syndactylyl
notoryctemorphia
what direction do they dig?
adaptation to habitat?
marsupial moles
fossorial - dig up and down
blink
diprotodontia
roos, wallabes, possums, koalas, wombats, etc
official name for “pouch”
purpose?
Marsupium
encloses teats, underdeveloped young crawl to teats to further develop
Metatherian reproduction
F w/ 2 vaginal canals and uteri
M w/ double headed penis
M w/ scrotum anterior to penis
No baculum
Difference between primitive marsupial dentition and primitive eutherian dentition
Marsup = 50 teeth
-more incisors and molars
Euth = 44 teeth
- more premolars
Dasyuromorphia - Tasmanian wolf skull compared to coyote skull?
Mars=palatal fenest., small/posterior AB, teeth gradually change
Euth=no palatal fenest., large AB., teeth distinctly change
Diprotodontia
- what is it?
- dentition?
- fusion of toes?
lower jaw shortened and first lower incisor elongated
diprotodont
syndactylous
Polyprotodont
-what is it?
unshortened mandible and lower incisor small and unspecialized
Skull features of metatheria
fenestrated palate inflected angular process small braincase small AB pronounced sagittal crest
didactylous definition
unfused toes
syndactylous definition
fused toes
what is unique about the hall in marsupials? How does it vary based on habitat?
the big toe is clawless.
opposable in arboreal species, reduced/absent in others
