Phylum Chordates Flashcards
1
Q
three unifying characteristics
A
- dorsal hollow nerve cord
- notochord
- pharyngeal gill slits
2
Q
Sub Phylum: Urochordata
A
acraniates, filter feeders, larval from looks like a tadpole and is free swimming, adults are sessile.
3
Q
Sub Phylum: Cephalochordata
A
“lancelets”, acraniate, filter feeder, somewhat free swimming
4
Q
Sub Phylum: Vertebrata
A
Craniates, vertebral column replaces notochord,
5
Q
Largest group of vertebrates
A
fishes!
6
Q
first vertebrates to occur in fossil records
A
fishes!
7
Q
Class: Agnatha
A
“Jawless fish”
8
Q
Class: Acanthodii
A
“Spiney fish”
9
Q
Class: Placodermi
A
“Armored fish”
10
Q
Class: Chondrichthyes
A
“Cartilaginous fish”
11
Q
Cartilaginous fish example
A
sharks and rays
12
Q
Agnatha characteristics
A
no paired limbs, circular mouth
13
Q
Acanthodii characteristics
A
extinct, jaws, paired limbs
14
Q
1st occurrence of jaws
A
Acanthodii
15
Q
1st occurrence of paired limbs
A
Acanthodii
