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Marsupials

Marsupial characteristics and order names

QuestionAnswer
Infraclass Metatheria Marsupials
Brain size of Marsupials Small
Auditory bullae (missing or present) Missing or made from alisphenoid bone
palatine vacuities are (large or small) Large (missing or small in eutharians)
Dental formula for Marsupials Primitive=50 teeth
Presence of what bone in both sexes Epipubic bone
What type of reproductive tract is in both sexes? Bifurcate
Marsupium is present in what percent of Marsupials? 50%
Placenta in Marsupials Choriovitelline
Placenta in Eutherians Chorioallantoic
Scrotum is (anterior or posterior) to penis anterior
Dental formula for Eutherians Primitive=44
basal metabolic rate is (higher or lower) than eutherians lower
Is a baculum present? never
gestation vs. lactation short gestation and long lactation
how many orders and families are there 7 orders and 20 families
Two types of dentition polyprotodont and diprotodont
polyprotodont unshortened mandible, lower incisors small & unspecialized
diprotodont shortened mandible, 1st pair of lower incisors enlarged to meet upper incisors
didactylous unfused toes
syndactylous 2nd & 3rd toes fused
south america has how many orders? 3
Australia has how many orders? 4
Order Didelphimorphia opossums & mouse opossums (oldest known metatherians, most diverse south american marsupial order)
Order Paucituberculata shrew or rat opossums
Order Microbiotheria Monito del Monte (monotypic)
Created by: musicfweak05
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