Taxonomy Search:

Iais californica
Iais californica
Taxonomic Group: Crustaceans-Isopods


Iais californica is a small asellotan isopod which lives commensally with the isopod Sphaeroma quoianum. It was first described in 1904 from San Francisco Bay, California (CA), but is now known to be native to New Zealand. Its non-native distribution currently ranges from Coos Bay, Oregon to San Diego Bay, CA, where it is found inhabiting decaying wood, soft rock, and marsh banks with the non-native isopod S. quoianum. No impacts have been reported for Iais californica, although its host organism, S. quoianum is regarded as an important ecosystem engineer in tidal marshes.

* Content for this species is based on the literature and peer review is pending - if you have comments or feedback please contact Paul Fofonoff at

This is some default tab content, embedded directly inside this space and not via Ajax. It can be shown when no tabs are automatically selected, or associated with a certain tab, in this case, the first tab.


Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
Access Date:

Marine Invasions Lab
Smithsonian Environmental Research Center

P.O. Box 28
647 Contees Wharf Road
Edgewater, MD 21037-0028 Tel: 443 482 2200
Fax: 443 482 2380

Databases Overview| Chesapeake Bay | National Database |