Parietobalaena yamaokai (image) PeerJ Share Print E-Mail Caption Open suture between the supraoccipital and exoccipital in (A) a fossil baleen whale (Parietobalaena yamaokai) and (B) a fetal specimen of blue whale, Balaenoptera musculus. Credit Cheng-Hsiu Tsai. Usage Restrictions CC BY 4.0 Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.