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Ditylum sp.
Rectangular-shaped diatom with a spike at each end and this round structure inside the rectangle at both ends.
A marine biologist on board skimmed some plankton using really fine mesh nets and we took a drop from that sample and placed it under a microscope. The sample was skimmed in Izhut Bay just off Afognak Island in somewhat shallow water (less than 200 feet).
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