Description: Flattened, ovoid cells that are yellow-brown in color. They have a shallow depression at the anterior end and average 50-70 m long and 30-45 um wide. Lack a posterior protrusion. They contain numerous, elongated chloroplasts that are radially arranged and a single pyrenoid. Considered by some to be C. marina var ovata
Type Locality: Ondo, Hiroshima Bay, Hiroshima Japan
Distribution: Western Japan
Authority: Chattonella ovata - Y. Hara et Chihara sp. nov.; C. marina var ovata - (Y. Hara & Chihara) Demura & Kawachi comb. et stat. nov.
Reference: Jpn. J. Phycol. (1994) 42: 407-420.; Phycol (2009) 48(6): 518-535