Predicted to be involved in sperm axoneme assembly. Predicted to act upstream of or within several processes, including animal organ morphogenesis; epithelial cilium movement involved in extracellular fluid movement; and motile cilium assembly. Predicted to be located in Golgi apparatus and sperm flagellum. Predicted to be active in manchette and sperm midpiece. Human ortholog(s) of this gene implicated in spermatogenic failure 43. Orthologous to human SPEF2 (sperm flagellar 2). [provided by Alliance of Genome Resources, Apr 2022]