The endocast of the insular and extinct Sylviornis neocaledoniae (Aves, Galliformes), reveals insights into its sensory specializations and its twilight ecology - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Scientific Reports Année : 2022

The endocast of the insular and extinct Sylviornis neocaledoniae (Aves, Galliformes), reveals insights into its sensory specializations and its twilight ecology

Ségolène Riamon
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Jean-Christophe Balouet
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Jeanne Rolland-Guillard
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Céline Salaviale
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Pauline Guenser
Jean-Sébastien Steyer

Résumé

Abstract Sylviornis neocaledoniae (Galliformes, Sylviornithidae), a recently extinct bird of New-Caledonia (Galliformes, Sylviornithidae) is the largest galliform that ever lived and one of the most enigmatic birds in the world. Herein, for the first time, we analyze its neuroanatomy that sheds light on its lifestyle, its brain shape and patterns being correlated to neurological functions. Using morphometric methods, we quantified the endocranial morphology of S. neocaledoniae and compared it with extinct and extant birds in order to obtain ecological and behavioral information about fossil birds. Sylviornis neocaledoniae exhibited reduced optic lobes, a condition also observed in nocturnal taxa endemic to predator-depauperate islands, such as Elephant birds. Functional interpretations suggest that S. neocaledoniae possessed a well-developed somatosensorial system and a good sense of smell in addition to its specialized visual ability for low light conditions, presumably for locating its food. We interpret these results as evidence for a crepuscular lifestyle in S. neocaledoniae .
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hal-04025282 , version 1 (16-03-2023)

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Ségolène Riamon, Jean-Christophe Balouet, Jeanne Rolland-Guillard, Céline Salaviale, Pauline Guenser, et al.. The endocast of the insular and extinct Sylviornis neocaledoniae (Aves, Galliformes), reveals insights into its sensory specializations and its twilight ecology. Scientific Reports, 2022, 12 (1), pp.21185. ⟨10.1038/s41598-022-14829-z⟩. ⟨hal-04025282⟩
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