Crayfish

1
Crayfish
2
CRAYFISH

• Body
• Two segments
• Cephalothorax
• Fused head and thorax
• 13 segments covered by a hard carapace
• Abdomen
• 7 segments
• Mandibles jaws for chewing (crush food)
• Maxillae holds food and passes it to the
  mandibles and the mouth (tear food)
• Maxillipeds sense organs which also help pass
  food to the mouth
• Chelipeds large, pincer appendages for food
  getting and protection
• Antennae segmented sense organs on the head
  (touch/taste)
• Antennule segmented sense organ
  (touch/taste/equilibrium)
• Walking legs four pairs
• Swimmerets aid in swimming and holding
  fertilized eggs in the female
• Blood returns to the heart through a slit (osita)
• Green gland nitrogenous waste excretion (located
  in the head)
• Senses compound eye /balance organ
• Reproduction sexual (distinct sexes)

3
Abdomen
4
Antennae
5
Antennule
6
Carapace
7
Cephalothorax
8
Cheliped
9
Digestive Gland (Dorsal)
10
Digestive Gland (Lateral)
11
Eggs
12
Esophagus
13
External View (Dorsal)
14
External View (Ventral)
15
Eye
16
Female
17
Male
18
Ganglion Anterior
19
Ganglion Posterior
20
Gill
21
Gonad
22
Green Gland
23
Heart
24
Intestine
25
Mandible
26
Maxilla
27
Maxillaped
28
Muscle
29
Stomach
30
Swimmeret
31
Telson
32
Uropod
33
Ventral Nerve Cord
34
Ventral Nerve Chord Posterior
35
Walking Leg
36
MOLTING