Phylum: Chordata Flashcards
1
Q
how many classes?
A
9
2
Q
embryological criteria
A
notochord (vertebral column)
post-anal tail (sacrum, tailbone)
pharyngeal gill slit (pharynx)
dorsal hollow nerve cord (spinal cord)
3
Q
class mammalia types
A
3 types
4
Q
criteria to be a mammal
A
hair
mammary glands (milk for young)
5
Q
groups of mammals
A
monotreme
marsupial
eutherian
6
Q
monotreme
A
duck billed platypus, echidna
7
Q
marsupial
A
pouched organisms ex. kangaroo
have “fetal births” very immature offspring that complete development in the pouch
8
Q
eutherian
A
true placental
tends to have more fully developed offspring than other mammals
