Mizuhobaris is an extinct genus of shelled octopods from the Late Miocene.
Fossils of M. lepta ware found in the Los Angeles Basin, California. This species is characterised by low radial ribs on a thin, keelless, planispirally coiled eggcase. It represents the first Argonautidae fossil from the Western Hemisphere.
References
Further reading Yanagisawa, Y. 1990. Bull. Geol. Surv. Japan 41 (3): 115-127.