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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Bill and skull metrics of American Thalasseus maximus and West African T. albididorsalis "Royal" Terns amend previously reported size differences and explain distinctive shapes (2022)
Auteurs :	Clive R. Barlow, Auteur ; Jason Waine, Auteur ; Judith White, Auteur ; J. Martin Collinson, Auteur ; Kimball L. Garrett, Auteur ; Alan Tye, Auteur
Type de document :	Article
Dans :	Malimbus (44(2) September, 2022)
Article en page(s) :	101-116
Résumé :	Despite the morphological similarity of the American Thalasseus maximus and West African T. albididorsalis "Royal" Terns, the latter has recently been shown to be more closely related to the Lesser Crested Tern T. bengalensis than to T. maximus. Comparative biometric and other studies of differences between T. maximus and T. albididorsalis are few, and skeletal material of the latter is scarce in museums. Here we compare bill and skull metrics of these two species, using 29 heads of T. albididorsalis found recently dead in The Gambia and Senegal, 18 museum skulls of T. maximus, and feathered museum specimens of nine T. albididorsalis and 25 T. maximus. We find that skull length, bill length, skull height and gonys height average greater in T. maximus (whereas previous accounts refer to a longer bill in T. albididorsalis), and show how the differences in head and bill shape between the two species can be attributed to differences in shape of particular bones of the skull. These observations refine the descriptions of the two species and contribute to their better separation in the field.

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