Skeletal measurements (cm) of Maiacetus inuus compared to those of the previously known protocetids Artiocetus clavis and Rodhocetus balochistanensis, which are also from the early middle Eocene of Pakistan [3].

Sexes of the A. clavis and R. balochistanensis specimens are not known.*Asterisk indicates estimated measurement.1Body weight is estimated from the centrum size of available thoracic vertebrae, using multiple regression and a reference set of 13 marine mammal skeletons of known weight (8 cetaceans and 5 pinnipeds) spanning a range of 85 to 23,500 kg (see Figure 13). Weight for female Maiacetus inuus is estimated from male M. inuus in two ways: using the 12% average difference in comparable linear dimensions or the 4% average difference found for premolars and molars (Table 2).2Ratio based on measurements of male and female adult specimens in Maiacetus inuus.