Mammalia - Cetacea - Balaenopteridae

Alternative combinations: Cetotherium cephalum, Cetotherium cephalus, Eschrichtius cephalus

Full reference: E. D. Cope. 1867. [Descriptions of Eschrichtius cephalus, Rhabdosteus latiradix, Squalodon atlanticus, and S. mento.]. Proceedings of the Academy of Natural Science of Philadelphia 1867:131-132

Belongs to Balaenoptera according to M. D. Uhen et al. 2008

Sister taxa: Balaenoptera brevicauda, Balaenoptera davidsonii, Balaenoptera fasciata, Balaenoptera floridana, Balaenoptera minutis, Balaenoptera physalus, Balaenoptera ryani, Balaenoptera sursiplana, Balaenoptera taiwanica

Type specimen: ANSP 12691, a partial skeleton (2 mandibuluar rami, 13 vertebrae, 4 rib fragments, and 137 misc bone fragments). Its type locality is James T. Thomas estate, which is in a Langhian marine horizon in the Calvert Formation of Maryland.

Ecology: aquatic suspension feeder

Average measurements (in mm): humerus length 296.0

Estimated body mass: 10.7 tons based on humerus length