Lab 3

Question 1

What orders are contained within Monotremata?

Answer 1

Tachyglossidae (echidnas) and Ornithorhynchidae (platypus)

Question 2

Characteristics of Monotremes

Answer 2

Oviparous 
Cloaca
Mammary glands lack nipples
Adults with no teeth
lack A.B., jugal, lacrimal

Question 3

Monotremes are Marsupials share what distinct characteristic?

Answer 3

Epipubic bone

Question 4

Ornithorhynchidae

• common name?
• characterists?

Answer 4

hair, bill, webbed feet
venomous barbs on males 
electroreceptors in bill
no pouch 
young with 3 molars

Question 5

Tachyglossidae

• common name?
• characterists?

Answer 5

long “snout” with receptors
hair are spines
large scoop-like claws
barbs on hind legs

Question 6

Metatherians

- classification?

Answer 6

metatheria = infraclass
theria = class
class = mammalia

Question 7

Didelphiorphia

• common name
• classification
• adaptation to arboreal envr?
• diet?

Answer 7

American opossum 
metatheria
- prehensile tail
- omnivorous 
"play possum"

Question 8

Pacituberculata

Answer 8

shrew opossums

metatheria

Question 9

Microbiotheria

Answer 9

monito de monte
nocturnal and arboreal
partially prehensile tail
insectivore

Question 10

dasyuromorphia

• diet
• dentition
• fusion of toes?

Answer 10

tasmanian devil, noombat marsupials
carnivores/scavengers/insectivores
polyprotodont
didactylous

Question 11

peramelemorphia
diet?
dentition?
fusion?

Answer 11

bandicoots and bilbies
omnivorous
polyprotodont
syndactylyl

Question 12

notoryctemorphia
what direction do they dig?
adaptation to habitat?

Answer 12

marsupial moles
fossorial - dig up and down
blink

Question 13

diprotodontia

Answer 13

roos, wallabes, possums, koalas, wombats, etc

Question 14

official name for “pouch”

purpose?

Answer 14

Marsupium

encloses teats, underdeveloped young crawl to teats to further develop

Question 15

Metatherian reproduction

Answer 15

F w/ 2 vaginal canals and uteri
M w/ double headed penis
M w/ scrotum anterior to penis
No baculum

Question 16

Difference between primitive marsupial dentition and primitive eutherian dentition

Answer 16

Marsup = 50 teeth
-more incisors and molars
Euth = 44 teeth
- more premolars

Question 17

Dasyuromorphia - Tasmanian wolf skull compared to coyote skull?

Answer 17

Mars=palatal fenest., small/posterior AB, teeth gradually change
Euth=no palatal fenest., large AB., teeth distinctly change

Question 18

Diprotodontia

• what is it?
• dentition?
• fusion of toes?

Answer 18

lower jaw shortened and first lower incisor elongated
diprotodont
syndactylous

Question 19

Polyprotodont

-what is it?

Answer 19

unshortened mandible and lower incisor small and unspecialized

Question 20

Skull features of metatheria

Answer 20

fenestrated palate
inflected angular process
small braincase
small AB 
pronounced sagittal crest

Question 21

didactylous definition

Answer 21

unfused toes

Question 22

syndactylous definition

Answer 22

fused toes

Question 23

what is unique about the hall in marsupials? How does it vary based on habitat?

Answer 23

the big toe is clawless.

opposable in arboreal species, reduced/absent in others