Potent inhibitor of insect, but not mammalian, voltage-gated calcium channels (Cav). Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Contains 3 disulfide bonds. Belongs to the neurotoxin 08 (Shiva) family. 02 (omega/kappa toxin) subfamily.