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English: Fossil - Avimaia Schweitzerae - Simplified phylogeny with hypothetical evolutionary stages of modern avian reproduction. [1][2][3]

https://www.nature.com/articles/s41467-019-09259-x

Simplified phylogeny with hypothetical evolutionary stages of modern avian reproduction. Stage 1: Plesiomorphic dinosaurian condition: abnormal multilayered eggshells due to egg retention can occur34, dinosauroid eggshell microstructure35, possible sexual dimorphism75, strong histological evidence for sexual maturity occurring prior to skeletal maturity63. Stage 2: Possible appearance of medullary bone4,8. Stage 3: Possible appearance of ornithoid eggshell microstructure35. Stage 4: Possible appearance of cuticular nanostructuring21. Stage 5: Strong evidence for sexual dimorphism (inferred sexually dimorphic feathers, e.g., ref. 65). Stage 6: In Avimaia: presence (not necessarily first occurrence) of cuticular nanostructuring, medullary bone, and a plesiomorphic non-avian dinosaur-like timing of sexual maturity within Aves. Further support for the presence of sexually dimorphic plumage. Stage 7: Avian-like timing of sexual maturity, skeletal maturity occurs prior to sexual maturity (probably evolved multiple times in parallel in Ornithuromorpha64)

References

  1. ↑ Bailleul, Alida M. (20 March 2019). "An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone". Nature Communications 10. DOI:10.1038/s41467-019-09259-x. Retrieved on 22 March 2019.
  2. ↑ Pickrell, John (20 March 2019). "Unlaid egg discovered in ancient bird fossil". Science. DOI:10.1126/science.aax3954. Retrieved on 22 March 2019.
  3. ↑ Greshko, Michael (20 March 2019). "In a first, fossil bird found with unlaid egg - “I couldn’t even sleep at night,” the lead paleontologist says of her reaction to the discovery.". National Geographic Society. Retrieved on 22 March 2019.
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Source https://media.springernature.com/lw900/springer-static/image/art%3A10.1038%2Fs41467-019-09259-x/MediaObjects/41467_2019_9259_Fig5_HTML.png
Author Alida M. Bailleul[1]

References

  1. ↑ Bailleul, Alida M. (20 March 2019). "An Early Cretaceous enantiornithine (Aves) preserving an unlaid egg and probable medullary bone". Nature Communications 10. DOI:10.1038/s41467-019-09259-x. Retrieved on 22 March 2019.
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Simplified Phylogeny - Hypothetical Evolutionary Stages - Modern Avian Reproduction

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