Abstract
A new species of commensal amphipod from the hydrothermal vent system of Guaymas Basin is described. Gammaropsis (Podoceropsis) grasslei was recovered from the carapace of the deep-water lithodid Neolithodes dioemedeae. It differs from other Gammaropsis (Podoceropsis) in exhibiting a longer palm of the second gnathopod of male, a highly ornamented entire and fleshy telson and the dense ornamentation of the maxillas.
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