Essential for male fertility and sperm motility (By similarity). During spermatogenesis, promotes the autophagic degradation of excessive ribosomes, providing energy resources for mitochondria and thus ensuring sperm flagellar motility (PubMed:34428398). {ECO:0000250|UniProtKB:A2AU72, ECO:0000269|PubMed:34428398}. This is the function of ENSG00000165309 (ARMC3, armadillo repeat containing 3).