Probable effector of the planar cell polarity signaling pathway which regulates the septin cytoskeleton in both ciliogenesis and collective cell movements including covergent extension during gastrulation. Controls cell shape but not polarization during convergent extension (PubMed:20671153). Proposed to function as core component of the CPLANE (ciliogenesis and planar polarity effectors) complex involved in the recruitment of peripheral IFT-A proteins to basal bodies. Interacts with sept2-a (PubMed:20671153). Interacts with intu and fuz; fuz, intu and wdpcp probably form the core CPLANE (ciliogenesis and planar polarity effectors) complex (By similarity). Also found adjacent to the cilium basal body. Expressed in the dorsal mesoderm of gastrulating embryos. Expressed in the midline and in a punctate pattern in the ciliates epidermis of stage 18 embryos. Expressed in otic vesicle, nephrostome and ventral neural tube of stage 34 embryos. Belongs to the WD repeat fritz family.