Many studies have reported the arrival and subsequent range expansion of foreign species within the marine ecosystems, but few studies have documented species that arrive and fail to establish. In 2000, the sea anemone Sagartia elegans (Dalyell, 1848) was first found in Salem, MA and persisted seasonally until the winter of 2010-2011 after which it has not been found. In both laboratory and field based temperature growth studies, S.