Schraderia mardeni is a species of amphipod in the family Pontogeneiidae. It was originally described as Dolobrotus mardeni,[1] and was the only species in the genus Dolobrotus, but that genus is now considered a synonym of Schraderia.[2] Discovered by Luis Marden, after whom it is named, Schraderia mardeni is a deep-water Atlantic lobster-bait scavenger or parasite.