A new species of lantern shark, Etmopterus robinsi, is described from the Caribbean Sea and western North Atlantic Ocean. Morphologically similar to and traditionally confused with E. hillianus (Poey, 1861), E. robinsi is distinguished by differences in the shape
of the suprapelvic photophore pattern, the density and shape of dermal denticles, and the number of precaudal vertebral centra. It also reaches a greater maximum length and males achieve sexual maturity at a larger size than E. hillianus. The two species occupy similar geographic ranges,
with E. robinsi generally occupying depths greater than 300 fms and E. hillianus usually found in shallower waters at depths of less than 350 fms.
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