GRUAE | \-+--Opisthocomiformes | \--Opisthocomidae (Hoatzin) | \-+--Gruiformes | \--+--+--Psophiidae (Trumpeters) | | \--+--Aramidae (Limpkin) | | \--Gruidae (Cranes) | \--+--+--Heliornithidae (Finfoots) | | \--Sarothruridae (Flufftails) | \--Rallidae (Rails, Gallinules, Coots) | \--Charadriiformes |--+--Chionidi | | |--+--Pluvianellidae (Magellanic Plover) | | | \--Chionidae (Sheathbills) | | \--+--Burhinidae (Thick-knees) | | | \--Charadrii | |--Pluvianidae (Egyptian Plover) | \--+--+--Pluvialidae (Pluvialis Plovers) | | \--+--Recurvirostridae (Stilts, Avocets) | | \--+--Ibidorhynchidae (Ibisbill) | | \--Haematopodidae (Oystercatchers) | \--Charadriidae (Plovers, Dotterals) | \--+--Limicoli | |--+--+--Pedionomidae (Plains-wanderer) | | | \--Thinocoridae (Seedsnipe) | | \--+--Rostratulidae (Painted-snipe) | | \--Jacanidae (Jacanas) | \--Scolopacidae (Sandpipers, Snipe) | \--+--Turnici | \--Turnicidae (Buttonquail) | \--Lari \--+--+--Dromadidae (Crab Plover) | \--Glareolidae (Coursers, Pratincoles) \--+--+--Stercorariidae (Skuas, Jaegers) | \--Alcidae (Auks) \--Laridae (Gulls, Skimmers, Terns)