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Schizoporella errata
Image courtesy of Chela Zabin, Smithsonian Environmental Research Center. Image shows Bryoliths from San Francisco Bay, California. 
Schizoporella errata
Taxonomic Group: Bryozoans


Schizoporella errata is a heavily calcified encrusting bryozoan which can grow in two forms: attached double layered colonies or unattached bryoliths (as shown in the picture). It was first described from Naples, Italy and appears to be native to the Mediterranean. It has been introduced throughout the Pacific and populations are known from California, Hawaii, American Samoa, New Zealand and Australia. It is tolerant of brackish water and has been found on eelgrass, oysters, rocks, pilings, docks and ships' hulls. As a frequent fouling organism, it has likely been introduced through hull fouling on commercial vessels.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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