The existence of cartilaginous sternal ribs in inia and Platanista shows affinity between these two genera and the Physeteridae.
Who ever saw a gun kill a manatee, they asked; or a cayman, or even an inia (fresh-water dolphin)?
In details, however, the skull is exceedingly like that of inia.
The skull closely resembles that of inia, and the scapula is, as in that genus, "normal."
The next genus, inia, is thus to be characterised:—Dorsal fin rudimentary; pectorals large and ovate.
Then they were called obol, a word of obscure etymology, or inia, which signifies sticking up or standing erect.