Diorocetus hiatus was a notably small and slender baleen whale that is known from four specimens (the type specimen can be seen at media link: https://flic.kr/p/nJFiZt). Amongst those four specimens, the skull and anterior portion of the axial skeleton is well represented (which is the frontmost portion of the whale, minus the flippers). Unfortunately, the paucity of fossil remains leaves us with insufficient data to infer growth-related information or sexual variation.
Although, there is some suggestion of echolocation in modern baleen whales, it is generally accepted that they do not (Clark & Ellison, 2004). Therefore, it is unknown whether D. hiatus was able to produce or receive echolocative information, but it most likely did not.
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