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An infertility disorder caused by spermatogenesis defects and characterized by abnormally shaped spermatozoa in the semen of affected individuals. SPGF18 patients present with primary infertility and multiple morphological abnormalities of sperm flagella that result in impaired sperm mobility. Abnormalities include absent, short, coiled, bent, and irregular flagella. SPGF18 inheritance is autosomal recessive.