Cyphopod

Cyphopods, also known as vulvae, are paired sacs in female millipedes that located on the underside of the third body segment that store sperm and connect to the oviduct.^[1] Cyphopods are sclerotized, and usually hidden behind a small opening. Despite the connotation of the suffix -pod (generally referring to legs or feet), cyphopods are not derived from walking legs.^[2]

Cyphopd pair (left) and closeup of a single (right) in Eviulisoma

Location of cyphopods (highlighted) in Ommatoiulus avatar