1. INSECT DEVELOPMENT

2. Spermatogenesis Germarium Zone of Growth Zone of Maturation
Zone of Transformation N N N N

3. Oogenesis Ovum Oogonium Mitosis to produce more germ cells
Onset of meiosis I
Primary oocyte
(meiosis I prophase - arrested - present at birth) 2N
Complete meiosis I
First polar body N
Secondary oocyte
(arrested at metaphase of meiosis II)
Ovulation
Ovum
Second polar body N

4. Structure of Egg polar granules micropyle yolk spheres
nuclear cytoplasm
aeropyle
chorion
nucleus
periplasm (cytoplasm)
polar granules
vitelline membrane

5. aeropyles
micropyle

6. Sperm Transfer
1. Spermatophore

7. spermatophore
sperm
nutrients for female

8. Does female actually get the nutrients?
Spermatophore takes up radioactive protein
Inject male with radioactive protein
Spermatophore passed to female
Eggs contain radioactive protein

9. Sperm Transfer
2. Direct intromission

10. Sperm Transfer
2. Direct intromission
Penes of male
Argia (Odonata)

11. Sperm Transfer
3. Traumatic (Haemocoelic) insemination

12. Development - Fertilization
Syncytial blastoderm
germ cells

13. Development - Germ Band Formation
Blastoderm cells
migrate ventrally
Germ band

14. Insect Development - Gastrulation1
ectoderm
mesoderm 2 3
germ band

15. Amnionic sac
Midgut rudiments 2 1
dorsal closure
neuroblasts 3 4

16. Gastrulation in Tribolium
Stage 2 -3 from previous slide

17. Heart
endoderm
Ectoderm
mesoderm
Gut
fat body
Hemocoel
tracheal invagination
somatic muscles
Ventral nerve cord

19. Fate of the Germ Layers cleavage energids blastoderm pole cells
ectoderm
mesoderm
endoderm
midgut
stomodeum
proctodeum
epidermis
trachea
salivary glands
mesodermal bands
neuroblasts CNS
gametes
gonad
visceral muscles
somatic muscles
fat body
heart