Abstract
Two new leucothoid amphipod species are described from the Western Atlantic Ocean. Leucothoe mucifibrosa sp. nov., collected from Belize, may represent a member of the “Paraleucothoe” group with a specific sponge host preference. Leucothoe darthvaderi sp. nov., collected from South Florida, is part of the Leucothoe spinicarpa species complex and has demonstrated a shift in host preference over time, possibly associated with environmental perturbances.
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