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![One large hydroid with a relatively thin stem and nine smaller stems withsmall hydroids expn5652.jpg One large hydroid with a relatively thin stem and nine smaller stems withsmall hydroids](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expn5652.jpg?itok=sWV1_INT)
Description
One large hydroid with a relatively thin stem and nine smaller stems withsmall hydroids. Are these different stages in the life cycle of the samespecies of hydroid? Two relatively large barnacles are also seen, the one toright with cirri extended. (Image credit: NOAA Office of Ocean Exploration and Research, 2015 Hohonu Moana)