Involved in the germline ring canal formation. May tether actin microfilament within the ovarian ring canal to the cell membrane. Contributes to actin microfilaments organization. Interacts with Ten-m. Localizes to intercellular bridges corresponding to ring canals that connect cytoplasm of nurse cells to the developing oocyte. Localizes to nurse cell plasma membranes. Detected in both the inner and outer rims of the ring canal. Germline-specific in females (at protein level). Expressed in ovary. Expressed throughout the egg-chamber development (at protein level). Expressed in the embryo. Shows defect in ring canal assembly and female sterility. Belongs to the filamin family. Extended N-terminus.