Results 71 to 80 of about 1,108 (163)

Comparative ossification and development of the skull in palaeognathous birds (Aves: Palaeognathae) [PDF]

open access: yesZoological Journal of the Linnean Society, 2009
Ratites and tinamous are a morphologically diverse group of flightless and weakly flighted birds. As one of the most basal clades of extant birds, they are frequently used as an outgroup for studies discussing character evolution within other avian orders.
openaire   +1 more source

The unexpected survival of an ancient lineage of anseriform birds into the Neogene of Australia: the youngest record of Presbyornithidae [PDF]

open access: yes, 2016
. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.Presbyornithids were the ...
Boles, Walter E   +4 more
core   +1 more source

Novel Quantification of Eggshell Surfaces in Dromaius novaehollandiae With Implications for the Fossil Eggshells of Oviraptorosauria (Dinosauria)

open access: yesEcology and Evolution, Volume 15, Issue 5, May 2025.
We have developed a new, quantitative method of assessing the variation on paleosurfaces. This method uses functions from the molaR package of R, including new functions detailed here. This paper tests the functions on the eggshell surfaces of extant emu (Dromaius novaehollandiae) and fossil oviraptorosaur eggs of the ootaxon Macroelongatoolithus ...
Joshua Hedge   +2 more
wiley   +1 more source

Palaeognathae: Apterygiformes, Casuariiformes, Rheiformes, Struthioniformes; Tinamiformes

open access: yes, 2018
The infraclass Palaeognathae includes the flightless ratites (ostrich, emu, rhea, cassowary, kiwi) and the tinamous, a group of related, flighted birds. This chapter focuses on unique anatomy and important non-infectious and infectious diseases of these groups of birds.
openaire   +1 more source

Antarctica as a Center of Origin of Birds [PDF]

open access: yes, 1954
Author Institution: Blue Sea Lake Biological Laboratory, Messines ...
Glenny, Fred H.
core  

Why do some sex chromosomes degenerate more slowly than others? The odd case of ratite sex chromosomes [PDF]

open access: yes, 2020
The hallmark of sex chromosome evolution is the progressive suppression of recombination which leads to subsequent degeneration of the non-recombining chromosome.
Silva, Willian T. A. F.   +2 more
core   +1 more source

The Lithornithiformes (Aves) from the early Eocene London Clay of Walton‐on‐the‐Naze (Essex, UK)

open access: yesPapers in Palaeontology, Volume 11, Issue 1, January/February 2025.
Abstract We describe multiple partial skeletons and isolated bones of the palaeognathous Lithornithiformes from the early Eocene London Clay of Walton‐on‐the‐Naze (Essex, UK). The well‐preserved specimens are assigned to at least four species of the taxa Lithornis and Pseudocrypturus. Two species of Lithornis are identified as L. nasi and L.
Gerald Mayr, Andrew C. Kitchener
wiley   +1 more source

Contrasting morphological evidence for the presence of taste buds in Dromaius novaehollandiae and Struthio camelus (Palaeognathae, Aves) [PDF]

open access: yesZoomorphology, 2015
This study, facilitated by the use of immunohistochemistry, indicated the presence of taste buds in Dromaius novaehollandiae but not in Struthio camelus. Seen at the light microscope level, the taste buds consisted of follicular cells and receptor cells.
Crole, Martina Rachel   +1 more
openaire   +2 more sources

On the use of integumentary characters in bird phylogeny: the case of Tinamus osgoodi (Palaeognathae: Tinamidae) and plumage charcater coding [PDF]

open access: yes, 2013
Los caracteres tegumentarios raramente han sido incluidos en Ornitología Sistemática, a pesar de que la mayoría de los caracteres utilizados para diferenciar especies son de plumaje, ranfoteca (cubierta córnea del pico y narinas) y podoteca (escamas de ...
Bertelli, Sara Beatriz   +1 more
core  

Circulating miRNAome of avian influenza‐infected ruddy turnstones Arenaria interpres

open access: yesJournal of Avian Biology, Volume 2025, Issue 1, January 2025.
MicroRNAs (miRNAs) are highly conserved small noncoding RNAs that regulate gene expression post‐transcriptionally. Circulating miRNAs – miRNAs that have been released from cells and circulate in the bloodstream – are relatively stable and interesting molecules for wildlife research, where they may form a proxy for gene expression as a function of the ...
Anne‐Fleur Brand   +6 more
wiley   +1 more source

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