Pycnogonids or sea spiders have muscles so small that they are only a single cell surrounded by connective tissue!

Pycnogonids or sea spiders have muscles so small that they are only a single cell surrounded by connective tissue! Image courtesy of NOAA Okeanos Explorer Program, 2013 Northeast U.S. Canyons Expedition.

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Related Links

Northeast U.S. Canyons Expedition 2013: July 22 Log

Northeast U.S. Canyons Expedition 2013

NOAA Ship Okeanos Explorer