Reptile Evolution
 
Vertebrata
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Tetrapoda
Basal Tetrapoda
Temnospondyli
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Reptilia/Amniota
Silvanerpeton
 
Archosauromorpha
Basal Archosauromorpha
Protosynapsida
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Terrestrial Younginiformes
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Birds / Aves
Phytodinosauria
 
Lepidosauromorpha
Urumqia clade
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Captorhinidae
Milleretta Limnoscelis clade
Bolosaurus Diadectes clade
Turtle Pareiasaur clade
Lanthanosuchia
Owenettidae
Lepidosauriformes
Lepidosauria
Tritosauria
Fenestrasauria • Pterosauria
Protosquamata
Squamata
 

Anhima cornuta (Brisson 1760; horned screamer, aka Palamedea cornuta) skull shown belongs to Chauna torquata (Oken 1816; Southern screamer; up to 90 cm in length) Screamers are extant birds in the family Anhimae. They include the genera Chauna and Anhima . The clade lacks uncinate processes on the ribs. but has large spurs on the metacarpus. The young are precocial (able to run soon after hatching). This is a rather primitive and very vocal clade.

Large spurs arise from the distal metacarpus (as a new ossification) and from the proximal metacarpus (as the return of digit ‘0’, a digit first brought to light with the Limusaurus discovery and misinterpretation). Along with the return of digit ‘0’ we also find fused vestiges of digits 4 and 5.

 
Velociraptor
Aurornis - Anchiornis
Eosinopteryx - Xiaotingia
 
Birds
Archaeopteryx
Jurapteryx
Sapeornis
Scansoriopterygidae 1
Scansoriopterygidae 2
Zhongornis - Confuciusornis
Enantiornithes 1
Archaeornithura
Enantiornithes 2
Enantiornithes 3
Hesperornis
Eogranivora
Yanornis - Ichthyornis
Gansus - Hongshanornis
Iteravis
 
Euornithes
Apteryx - Pseudocrypturus
Rhea - Casuarius
Struthio - Palaelodus
 
Neognatha
Megapodius
Nahmavis
Ardeotis
Vultur
Falconiformes
Sagittarius - Terror Birds
Pandion
Falco - Didunculus
Tyto - Apus
Psophia
Cuculiformes
Cariama - Phoenicopterus
Geococcyx
Oedicnemus
Fulica
Galliformes
Columba
Goura
Raphus
Gallus
Passer
Opisthocomus
Aptornis
Dinornis
Ara - Gastornis
Corvidae
Threskiornis
Corvus - Cyanocitta
Melanerpes
Cinclus - Hirundo
Troglodytes
Ralliformes
Crex
Charadrius
Rallus
Gruiformes
Grus - Eurypyga
Chroicocephalus
Himantopus
Archilochus
Coraciformes
Thalasseus
Uria - Aptenodytes
Megaceryle - Jabiru
Ardea - Ciconia
Gavia
Scopidae
Scopus
Pteroglossus - Buceros
Cyrilavis
Urocolius
Anseriformes
Platalea
Pelecanus
Presbyornis - Anas
Suliformes
Fregata
Macronectes - Pelagornis
Fratercula - Pinguinus
 

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