With restricted distributions, serious conservation threats, and relatively low taxonomic richness compared with
other odontocete clades, the evolutionary history of «river dolphins» remains a topic of perennial interest (Cassens et al., 2000; Hamilton et al., 2001; Nikaido et al., 2001; Pyenson, 2009; Ruiz - Garcia & Shostell, 2010; Turvey et al., 2010; Geisler et al., 2011).
While the ICRW includes definitions of some
odontocetes and includes references to toothed whales in its schedule (the binding rules and definitions that implement the ICRW), the IWC has concentrated its management on the great whales, setting quotas and
other restrictions on hunting.