Veterinary Entomology 208
Spring 2010
 Today
we will be using the grasshopper
as a model insect:
1. Work
in pairs
2. Read through the handout on external
anatomy
3. DO NOT CUT INTO THE GRASSHOPPER
antenna
compound eye
ocelli
labrum
hypopharynx
filler
mandible
maxilla
labium
dorsal
notum
posterior
pleuron
sternum
ventral
anterior
 thorax
head
thorax
divided into
• prothorax
• mesothorax
• Metathorax
 1st
pair of legs =
prothoracic legs
abdomen
 1st
pair of wings =
mesothoracic wings
 2nd
pair of wings =
metathoracic wings
MALE – CLASPERS (CERCI)
FEMALE – OVIPOSITOR
1.
Know the underlined structures
2.
Pull off the mouthparts to identify them
3.
Look at the demonstration material
4.
Make sure you are familiar with both
male and female external anatomy
1.
Read through the handout on internal
anatomy
2.
We will go through the procedure for
dissection and what structures will be
visible
3.
DON’T CUT THEM YET
 The
first thing you will see is the
reproductive system on the dorsal
surface of the grasshopper
• Male – testes
• Female – ovaries
 Make
 Look
sure you are familiar with both
at the demo
foregut
midgut
hindgut
anus
crop
gizzard
gastric
caecae
stomach
malpighian
tubules
ileum
colon
connective
1.
2.
3.
4.
5.
6.
7.
8.
Cut off the head
Cut off the legs
Watch out for the esophagus and cut down
both sides of the grasshopper
Gently pull the back off
Observe the reproductive system lying
over the digestive system
Observe the digestive system
Under the digestive system is the delicate
nervous system
Clean up
Mesothoracic
wing
antennae
-
Metathoracic
wing