2. Entomology 305 Integument

3. Integument

4. Integument Some Functions
protection
mechanical
biological pathogens (virus, fungi, etc.)
sensory interface
sensilla (various)
water retention
exocrine gland product deposition substrate
muscle / organ attachment
feeding (mouthparts)
locomotion (legs, wings)
reproduction (genitalia, ovipositor)
cuticle (non-cellular, secreted)
epidermis (living cells)

5. Molting

6. Integument epidermis – living cells cuticle – acelluar, secreted
body surface
epidermis – living cells
cuticle – acelluar, secreted
exocuticle
cuticle
procuticle
pore canals
endocuticle
formation zone
epidermis
epidermis
hemocoel (body cavity)

7. Epicuticle
epicuticle
cuticulin layer
cuticulin layer: acellular; secreted by epidermis before procuticle; protein
wax layer: acellular; secreted by epidermis after procuticle; waxes
cement layer: acellular; secreted by epidermis after procuticle; protein

8. Sclerites and Membrane (cross-section)

9. Integumental structures: Apodeme & Phragma (cross-section)
apodeme (apodemes)
phragma (phragmata)
muscle
anterior arm of tentorium (an apodeme)
anterior tentorial pit

10. Terminology of Some Basic Integumental Structures
Sulcus
Costa or Phragma
Sulcus
External Structures
sulcus(sulci) / suture(-s)
ecdysial line(s)
(arthrodial) membrane
spine(-s)
spur(-s)
Internal Structures
apodeme(-s)
phragma(-ta)
costa(-e)

11. Integumental structures: Seta(-e)
the typical insect “hair”
=macrotrichium(-ia)
has membranous basal articulation
formed from several epidermal cells, typically 3
trichogen cell (seta)
tormogen cell (socket)
nerve cell (sensory)
mostly mechanoreceptors
morphological form of setae varies greatly
seta
tormogen cell
trichogen cell
nerve cell

12. Integumental structures: Microtrichium(-ia)
wing vein
very small cuticular “fuzz”
simple outgrowths of cuticle
non-cellular
no basal articulation
no sensory nerve
microtrichium
seta (=macrotrichium)

13. FINIS