for a while. During this descent, it captures and feeds on the zooplankton it encounters and small benthic organisms may be caught underneath as it lands. Its diet consists mostly of small crustaceans, including barnacle larvae, copepod eggs and larvae, and crab larvae. M. marginata can reproduce both sexually and asexually, by budding. All individuals found in the Napa and Petaluma River population are male, and must have been produced asexually following the original introduction of perhaps a single male polyp. References Olindiidae Hydrozoan genera