Condensing enzyme that elongates saturated and monounsaturated very long chain fatty acids, to yield products up to 30 carbons in length. May also elongate diunsaturated fatty acids. Important for courtship behavior where it probably has a role in female pheromone biosynthesis. a very-long-chain acyl-CoA + H(+) + malonyl-CoA = a very-long-chain 3-oxoacyl-CoA + CO2 + CoA Lipid metabolism; fatty acid biosynthesis. Highly expressed in females. Little or no expression detected in males. RNAi-mediated knockdown results in an altered hydrocarbon profile in females, with significantly increased levels of C25 7,11-dienes and reduced levels of C27 7,11-dienes. Monounsaturated and saturated hydrocarbon levels are also affected with increased levels of C23 fatty acids and reduced levels of C27 fatty acids. Males have a normal hydrocarbon profile. RNAi-mediated knockdown in females (mated to wild-type males) results in impaired courtship behavior with reduced numbers of copulation attempts and increased copulation latency. Belongs to the ELO family.