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Arrow worm, Chaetognatha 8-22-15-6555.jpg

Arrow worm, Chaetognatha, The planktonic ridge,meaning bristle-jaws, and commonly known as arrow worms, is a phylum of predatory marine worms which are a major component of plankton worldwide. About 20% of the known species are benthic, and can attach to algae and rocks, 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.