A larva of a deep-sea bivalve called Bathypecten vulcani collected on the East Pacific Rise. Its diameter is 840 microns (the width of a human hair is about 100 microns).
[From the Photographic Identification Guide to Larvae at Hydrothermal Vents in the Eastern Pacific by S.W. Mills, S.E. Beaulieu, and L.S. Mullineaux http://www.whoi.edu/science/B/vent-larval-id.] (Photographic Identification Guide to Larvae at Hydrothermal Vents in the Eastern Pacific)[back]
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