Janjucetus is estimated to have been about 3.5 m (11 ft) in length, about the size of the modern bottlenose dolphin and much smaller than any living baleen whale. It is considered to be a mysticete due to key synapomorphies of the skull anatomy, for example in the way rostral bones meet the bones of the braincase. The relatively short snout tapers anteriorly from a broad base and is triangular in dorsal view. The incisors and canines form a terminal rosette of conical stabbing teeth, while the premolars and molars are shaped like serrated blades. The orbits are exceptionally large. No evidence shows Janjucetus possessed the ability to echolocate and probably relied on good eyesight to locate its prey.
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