It is mostly agreed, however, that Eschrichtius belongs to a small clade (Eschrichtiidae) best regarded as the sister-taxon to Balaenopteridae.    From Wordnik.com.  [Archive 2006-10-01] Reference

For the user that is a more serious marine biologist, there is a link that displays an alternate index, sorting the animals into their family groups; the Balaenopteridae, for example, are grouped together.    From Wordnik.com.  [Archive 2006-05-01] Reference

In terms of its taxonomic description, the researchers say this is "difficult", although the morphology of the scapula (shoulder blade) suggests it is "from the Balaenopteridae.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference