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

Our Test Subject

antenna compound eye mandible maxilla labium ocelli filler hypopharynx labrum

dorsal ventral anterior posterior notum pleuron sternum

 thorax divided into prothorax mesothorax Metathorax  1 st pair of legs = prothoracic legs  1 st pair of wings = mesothoracic wings  2 nd pair of wings = metathoracic wings head thorax abdomen

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 sure you are familiar with both  Look at the demo

foregutmidguthindgut crop gizzard gastric caecae stomach malpighian tubules ileum colon anus

connective

1. Cut off the head 2. Cut off the legs 3. Watch out for the esophagus and cut down both sides of the grasshopper 4. Gently pull the back off 5. Observe the reproductive system lying over the digestive system 6. Observe the digestive system 7. Under the digestive system is the delicate nervous system 8. Clean up

Mesothoracic wing Metathoracic wing - antennae