University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Publications, Agencies and Staff of the U.S. Department of Commerce U.S. Department of Commerce 3-7-2001 Evolution of river dolphins Healy Hamilton Susana Caballero Allen G. Collins Robert L. Brownell Jr. NOAA,
[email protected] Follow this and additional works at: https://digitalcommons.unl.edu/usdeptcommercepub Part of the Environmental Sciences Commons Hamilton, Healy; Caballero, Susana; Collins, Allen G.; and Brownell, Robert L. Jr., "Evolution of river dolphins" (2001). Publications, Agencies and Staff of the U.S. Department of Commerce. 111. https://digitalcommons.unl.edu/usdeptcommercepub/111 This Article is brought to you for free and open access by the U.S. Department of Commerce at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Publications, Agencies and Staff of the U.S. Department of Commerce by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Proceedings: Biological Sciences, Vol. 268, No. 1466 (Mar. 7, 2001), pp. 549-556 B THE ROYAL doi 10.1098/rspb.2000.1385 92 SOCIETY Evolution of river dolphins Healy E{amiltonltsSusana Caballero2,Allen G. Coll;nsl and Robert L. BrownellJr3 lMuseumof Paleontologyand Department of IntegrativeBiology, University of California,Berkeley, CA 94720, USA 2FundacionSubarta, Carrara 24Foeste, no 3-110,Cali, Colombia 3SouthwestFisheries Science Center, PO Box 271,La jrolla, CA 92038, USA The world's river dolphins (Inia, Pontoporia,Lipotes and Platanista)are among the least known and most endangered of all cetaceans. The four extant genera inhabit geographically disjunct river systems and exhibit highly modified morphologies, leading many cetologists to regard river dolphins as an unnatural group.