In addition, molecular biological techniques have been applied to address phylogenetic relationships among families within the suborder Mysticeti or Odontoceti, and within families, especially within the families Delphinidae and Phocoenidae, and river dolphins. 此外,分子生物学技术还被用于解决须鲸亚目和齿鲸亚目内科间以及科内种间的系统发生关系,特别是齿鲸亚目的海豚科、鼠豚科和淡水豚类。