This order comprises four families:

• Procellariidae (petrels, shearwaters)
• Hydrobatidae (northern storm petrels)
• Oceanitidae (southern storm petrels)
• Diomedeidae (albatrosses)

References

Ferrer-Obiol, J., H.F. James, R.T. Chesser, V. Bretagnolle, J. Gonzalez-Solis, J. Rozas, M. Riutort, and A.J. Welch (2021), Integrating sequence capture and

restriction site-associated DNA sequencing to resolve recent radiations of pelagic seabirds, Sys. Biol. syaa101. DOI: 10.1093/sysbio/syaa101. (pdf)