Creatures from the River: Bryozoa

Yesterday, while out conducting routine water monitoring, our Water Quality Specialist Masaya Maeda found this blob in the water near Bladensburg Waterfront Park. Not as pretty as some of his other photos but it's still part of our river's ecosystem, and a nifty specimen at that.

It's a colony of Bryozoa, which is a group of organisms that has been around for approximately 5 million years! Most of these critters live in marine waters, but there is one class from the Bryozoan phylum that lives in freshwater: Phylactolaemata. The colonies form on submerged logs, branches, etc. and can be 2 to 7 feet in diameter.

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