There are seven types of silk produced by seven silk glands: 1) Achniform gland: swathing silk; 2) Cylindriform gland: egg sac silk; 3) Ampullate glands (major and minor): non-sticky dragline silk; 4) Pyriform gland: attaching threads - attachment discs; 5) Flagelliform gland: core fibres of sticky silk; 6) Aggregate gland: outer part of sticky silk 7) Tubuliform: Egg-Cocoon ...