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On the Ancestry of Feathers in Mesozoic Dinosaurs

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The Evolution of Feathers

Part of the book series: Fascinating Life Sciences ((FLS))

Abstract

Over the last two decades, the dinosaur fossil record has revealed much about the nature of their epidermal structures. These data challenged long-standing hypotheses of widespread reptile-like scalation in dinosaurs and provided additional evidence that supported the deeply nested position of birds within the clade. Moreover, in recent years, the discovery of filamentous structures in numerous species across the dinosaurian evolutionary tree suggests a model of deep feather homology within dinosaurs, with the appearance of feathers hypothesised to coincide with the dinosaur origin. Thanks to phylogenetic comparative methods, these homologies can now be tested empirically and form the basis of this study. Based on a dataset of 77 dinosaur species that preserve integumentary structures, we undertake a series of model-fitting and ancestral state reconstruction analyses to interpret the evolutionary history and ancestral integumentary condition in dinosaurs. Our results provide the first empirical support for the evolution of feathers in an ordered fashion, but reveal that these evolutionary trends were not always towards ‘more complex’ conditions. Ancestral state reconstructions demonstrate that irrespective of the preferred phylogenetic framework, the ancestral pterosaur condition or whether any one major dinosaur lineage had a Late Triassic-feathered representative, support values for a filamentous/feathered dinosaur ancestor are low. More examples of feathered taxa from across the dinosaur tree, and in particular the discovery of as yet unknown feathered Triassic taxa, will be needed in order to overturn current support for a scaly dinosaurian ancestor.

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Acknowledgements

We thank the editors (C. Foth and O. Rauhut) for inviting us to contribute to this volume, for their insightful comments, and for their patience. We thank P. Bell, R. Benson, R. Butler, M. Davis and M. Young for discussions related to feather evolution and dinosaur skin.

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Correspondence to Nicolás E. Campione .

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12.1 Electronic Supplementary Material

Appendix

Appendix

Character coding data set used in the analyses

Taxon

Char1a

Char2a

Char1b

Char2b

Char1c

Char2c

Max

Min

Crurotarsi

0

0

0

0

0

0

247.2

0

Pterosauria

0

0

1

1

3

2

212

66

Allosaurus_fragilis

0

0

0

0

0

0

157.3

152.1

Albertosaurus_sarcophagus

0

0

0

0

0

0

72.1

66

Anchiornis_huxleyi

2

1

2

1

2

1

163.5

157.3

Archaeopteryx_lithographica

2

1

2

1

2

1

152.1

145

Auca_Maheuvo_titanosaur

0

0

0

0

0

0

83.6

72.1

Aurornis_xui

2

1

2

1

2

1

163.5

157.3

Barosaurus_lentus

0

0

0

0

0

0

157.3

152.1

Beipiaosaurus_inexpectus

1

1

1

1

1

1

129.4

125

Brachylophosaurus_canadensis

0

0

0

0

0

0

83.6

72.1

Camarasaurus_sp.

0

0

0

0

0

0

157.3

152.1

Carnotaurus_sastrei

0

0

0

0

0

0

83.6

72.1

Caudipteryx_dongi

2

1

2

1

2

1

129.4

125

Caudipteryx_zhoui

2

1

2

1

2

1

129.4

125

Centrosaurus_apertus

0

0

0

0

0

0

83.6

72.1

cf._Stegosaurus_sp.

0

0

0

0

0

0

157.3

152.1

Chasmosaurus_belli

0

0

0

0

0

0

83.6

72.1

Compsognathus_longipes

0

0

0

0

0

0

152.1

145

Concavenator_corcovatus

0

0

0

0

0

0

129.4

125

Confuciusornis_sanctus

2

1

2

1

2

1

129.4

125

Corythosaurus_casuarius

0

0

0

0

0

0

83.6

72.1

Corythosaurus_intermedius

0

0

0

0

0

0

83.6

72.1

Daspletosaurus_torosus

0

0

0

0

0

0

83.6

72.1

Dilong_paradoxus

2

1

2

1

2

1

129.4

125

Diplodocus_sp.

0

0

0

0

0

0

157.3

152.1

Dyoplosaurus_acutosquameus

0

0

0

0

0

0

83.6

72.1

Edmontosaurus_annectens

0

0

0

0

0

0

72.1

66

Edmontosaurus_regalis

0

0

0

0

0

0

83.6

72.1

Eosinopteryx_brevipenna

2

1

2

1

2

1

163.5

157.3

Epidexipteryx_hui

2

1

2

1

2

1

163.5

157.3

Euoplocephalus_tutus

0

0

0

0

0

0

83.6

72.1

Gigantspinosaurus_szechuanensis

0

0

0

0

0

0

163.5

157.3

Gorgosaurus_libratus

0

0

0

0

0

0

83.6

72.1

Gryposaurus_monumentensis

0

0

0

0

0

0

83.6

72.1

Gryposaurus_notabilis

0

0

0

0

0

0

83.6

72.1

Hesperosaurus_mjosi

0

0

0

0

0

0

157.3

152.1

Hypacrosaurus_altispinus

0

0

0

0

0

0

72.1

66

Jinfengopteryx_elegans

2

1

2

1

2

1

129.4

125

Juravenator_starkii

1

1

1

1

1

1

152.1

145

Kulindadromeus_zabaikalicus

2

1

2

1

2

1

169

144

Lambeosaurus_clavinitialis

0

0

0

0

0

0

83.6

72.1

Lambeosaurus_magnicristatus

0

0

0

0

0

0

83.6

72.1

Liaoningosaurus_paradoxus

0

0

0

0

0

0

129.4

125

Magnipaulia_laticaudus

0

0

0

0

0

0

83.6

72.1

Maiasaura_peeblesorum

0

0

0

0

0

0

83.6

72.1

Mamenchisaurus_youngi

0

0

0

0

0

0

163.5

152.1

Mantellisaurus_atherfieldensis

0

0

0

0

0

0

129.4

125

Microraptor_gui

2

1

2

1

2

1

125

113

Microraptor_zhaoianus

2

1

2

1

2

1

125

113

Ornithomimus_edmontonicus

2

1

2

1

2

1

83.6

66

Parasaurolophus_walkeri

0

0

0

0

0

0

83.6

72.1

Pedopenna_daohugouensis

2

1

2

1

2

1

163.5

157.3

Pelorosaurus_becklesii

0

0

0

0

0

0

139.8

132.9

Prosaurolophus_maximus

0

0

0

0

0

0

83.6

72.1

Protarchaeopteryx_robusta

2

1

2

1

2

1

129.4

125

Psittacosaurus_sp.

1

1

1

1

1

1

129.4

125

Rahonavis_ostromi

2

1

2

1

2

1

72.1

66

Saurolophus_angustirostris

0

0

0

0

0

0

72.1

66

Saurolophus_osborni

0

0

0

0

0

0

72.1

66

Scansoriopteryx_heilmanni

2

1

2

1

2

1

163.5

157.3

Scelidosaurus_harrisonii

0

0

0

0

0

0

199.3

190.8

Sciurumimus_albersodoefri

1

1

1

1

1

1

157.3

152.1

Scolosaurus_cutleri

0

0

0

0

0

0

83.6

72.1

Shuvuuia_deserti

1

1

1

1

1

1

83.6

72.1

Similicaudipteryx_yixianensis

2

1

2

1

2

1

129.4

125

Sinocalliopteryx_gigas

1

1

1

1

1

1

129.4

125

Sinornithosaurus_millenii

2

1

2

1

2

1

129.4

125

Sinosauropteryx_prima

1

1

1

1

1

1

129.4

125

Tarbosaurus_bataar

0

0

0

0

0

0

72.1

66

Tarchia_kielanae

0

0

0

0

0

0

72.1

66

Tehuelchesaurus_benitezii

0

0

0

0

0

0

157.3

152.1

Tenontosaurus_sp.

0

0

0

0

0

0

125

113

Tianyulong_confuciusi

1

1

1

1

1

1

163.5

157.3

Triceratops_horridus

0

0

0

0

0

0

72.1

66

Tyrannosaurus_rex

0

0

0

0

0

0

72.1

66

Velociraptor_mongoliensis

2

1

2

1

2

1

83.6

72.1

Xiaotingia_zhengi

1

1

1

1

1

1

163.5

157.3

Yutyrannus_huali

1

1

1

1

1

1

129.4

125

  1. Codings are explained in the text. Char1 refers to a multistate treatment of the filamentous/feathered condition; Char2 lumps all non-scaly conditions into a single state (i.e. binary); a, b, and c represent different assumptions made for ancestral condition in pterosaurs. Maximal and minimal ages are in millions of years

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Campione, N.E., Barrett, P.M., Evans, D.C. (2020). On the Ancestry of Feathers in Mesozoic Dinosaurs. In: Foth, C., Rauhut, O. (eds) The Evolution of Feathers. Fascinating Life Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-27223-4_12

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