Component of the BBSome complex (By similarity). The BBSome complex is thought to function as a coat complex required for sorting of specific membrane proteins to the primary cilia. The BBSome complex is required for ciliogenesis but is dispensable for centriolar satellite function (By similarity). Required for proper BBSome complex assembly and its ciliary localization (PubMed:22922713). Required for cilia biogenesis and both the assembly and movement of intraflagellar transport proteins along the ciliary axoneme (PubMed:15231740, PubMed:22022287, PubMed:22922713). Part of BBSome complex, that contains at least bbs-1, bbs-2, bbs-4, bbs-5, osm-12, bbs-8/ttc-8 and bbs-9. Expressed in ciliated cells including amphid and both inner and outer labial neurons of the head and in both phasmid neurons PHA and PHB in the tail at larval stages L1 and L2. Mutants have normal body morphology, but with reduced body length and width, delayed larval development and decreased roaming movements (PubMed:22022287). Defective cilia structure and function (PubMed:22022287). Disrupted assembly of the BBSome complex at the base of the cilia (PubMed:22922713).