Entomology 305 Integument

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Presentation transcript:

Entomology 305 Integument

Integument

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)

Molting

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)

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

Sclerites and Membrane (cross-section)

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

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)

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

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)

FINIS