Spider venom toxin that exhibits cytolytic activity by forming an alpha-helix across the membrane (By similarity). Lethal to insect larvae (PubMed:24717175). Expressed by the venom gland. LD(50) is 33-50 ug/g in S.carnaria larvae. PD(50) is 25-33 ug/g in S.carnaria larvae. Belongs to the spider toxin CSTX family.