This order is represented by the family Gaviidae with the genus Gavia as its only member. 


Timetree of Gaviidae based on Sprengelmeyer (2014), with the distribution of each family being indicated by the colour-code used throughout this website (see Distribution code). 


Sprengelmeyer, Q.D. (2014), "A phylogenetic reevaluation of the genus Gavia using next-generation sequencing", Master´s Thesis, Northern Michigan

University (pdf)