Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Marsupials/Placental

Comparison between marsupials (metatherians) and placental mammals.

QuestionAnswer
Braincase is small relative to body size. Minimally developed neocortex. No corpus callopsum. Marsupials
Braincase is large relative to body size. Largely developed neocortex. Corpus callopsum present. Eutherians
Auditory bullae (generally) absent. Marsupials
Auditory bullae present. Formed from tympanic bone. Eutherians
Large jugal bone. Jugal and squamosal bones articulate with dentary bones in the mandibular fossa. Marsupials
Jugal bone does not articulate with dentary bones in the mandibular fossa. Eutherians
Angular process inflicted 90 degrees. Marsupials
Dental formula 5/4, 1/1, 3/3, 4/4 = 50. Teeth (mostly) non-deciduous. Marsupials
Dental formula 3/3, 1/1, 4/4, 3/3 = 4. Teeth (excluding molars) deciduous. Eutherians
Epipubic bones occur in both sexes. Marsupials
Scrotum anterior to penis. Baculum not present. Marsupials
Scrotum posterior to penis. Baculum sometimes present. Eutherians
(Often) contains marsupium that encloses teats. Marsupials
Created by: bettafische