Shark Bio Flashcards
0
Q
Ex. Groundsharks (1)
A
Carcharhiniformes
1
Q
What two parts help extract oxygen
A
Gills and the spiracle
2
Q
Ex. Frilled sharks (3)
A
Hexanchiformes
3
Q
Ex. Bullhead sharks (2)
A
Heterodontiformes
4
Q
Ex. Mackerel sharks (4)
A
Lamniformes
5
Q
Ex. Carpet sharks (5)
A
Orectolobiformes
6
Q
Ex. Saw sharks (6)
A
Pristiophoriformes
7
Q
Ex. Dogfish (7)
A
Squaliformes
8
Q
Ex. Angel sharks (8)
A
Squatiniformes
9
Q
Sharks first appeared how many years ago?
A
400 million years
10
Q
Fossil sharks were divided into which two groups
A
Xenacanths and hybodonts
11
Q
What fossils showed evidence that they had been eaten by sharks
A
Marine mammal bones
12
Q
How many families of sharks are there?
A
30 families (375 species)
13
Q
Intestinal valve is either..
A
Spiral or scroll
14
Q
Sharks skin is made of soft but prickly hairs called
A
Dermal denticles
