INSECT DEVELOPMENT.

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Presentation transcript:

INSECT DEVELOPMENT

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

aeropyles micropyle

Sperm Transfer 1. Spermatophore

Sperm Transfer 2. Direct intromission

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

Sperm Transfer 3. Traumatic (Haemocoelic) insemination

Development - Fertilization Syncytial blastoderm germ cells

Development - Germ Band Formation Blastoderm cells migrate ventrally Germ band

Insect Development - Gastrulation 1 ectoderm mesoderm 2 3 germ band

Amnionic sac Midgut rudiments 2 1 dorsal closure neuroblasts 3 4

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

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

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