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Jellyfish -Ptychogastria polaris larva 8-22-15-6568b.jpg

Medusa larva, Ptychogastria polaris,The planktonic ridge, Blackwater diving over the Gulfstream Current off Riviera Beach, Florida, over 400 foot depth, 2.5 knots, northbound, 7 mile stretch aboard Sirena, Pura Vida Divers.