Sex and Ontogenetic Variation in the Crest of Numida meleagris: Implications for Crested Vertebrates.
2D-morphometric
birds
cranial crest
helmeted Guinea fowl
Journal
Anatomical record (Hoboken, N.J. : 2007)
ISSN: 1932-8494
Titre abrégé: Anat Rec (Hoboken)
Pays: United States
ID NLM: 101292775
Informations de publication
Date de publication:
04 2020
04 2020
Historique:
received:
01
10
2018
revised:
10
05
2019
accepted:
08
06
2019
pubmed:
9
11
2019
medline:
9
2
2021
entrez:
9
11
2019
Statut:
ppublish
Résumé
Crested vertebrates are known from a wide variety of modern and fossil taxa, however, the actual formation and function of the crest is still debatable. Among modern birds, the globally distributed guinea fowl (Numida meleagris) is characterized by having a cranial bony crest (overlain by keratin), but surprisingly little is known about its development. Here, we studied the crest of 202 wild guinea fowl from the same population, using anatomical measurements as well as 2D-morphometry. Our results show that juveniles have smaller skulls than adults and have smaller, simpler crests that are visible even in very young individuals. Among adults, female skulls are smaller than males, and they have smaller, simpler shaped crests, which permit a discrimination between the sexes of 93% when the keratin is preserved with the bony crest, and of 89% when only the bony crest is available. By extrapolation, these results confirm that the crest can be used as an ontogenetic character, as well as for sex discrimination in the fossil record. Our results also show that the overlying keratin does not always mimic the underlying bony crest, which should be considered when reconstructing extinct crested vertebrates. Anat Rec, 303:1018-1034, 2020. © 2019 American Association for Anatomy.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1018-1034Informations de copyright
© 2019 American Association for Anatomy.
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