A Derived Morphology of the Quadrate May Support a Previously Unrecognized Major Higher-Level Clade of Neoavian Birds. [PDF]
J MorpholThe avian quadrate plays a critical role in cranial kinesis, but few comparative studies exist of its morphological variation across higher‐level taxa. In this study, the occurrence of a markedly concave articular facet of the condylus medialis is surveyed across neornithine birds.
Mayr G.
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Adaptation in the Avian Middle Ear-The Columellar Annular Ligament in Aquatic and Diving Birds. [PDF]
J MorpholThe size of the columellar footplate relative to the oval window shows striking variation across species: it fits snugly within the oval window in, for example owls (left), but considerably smaller than the oval window in diving taxa such as cormorants (right).
Peacock J.
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Fossil and modern penguin tarsometatarsi: cavities, vascularity, and resilience. [PDF]
Integr ZoolIn tarsometatarsi of Eocene and extant penguins, the distribution of primary diaphyseal nutrient foramina as well as dimensions of medullary cavities appears to align more with overall body‐size categories than geological age, albeit the extinct genus Anthropornis is unique in both respects.
Jadwiszczak P, Krüger A, Mörs T.
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Holding a wing horizontal: Roles for muscles of the pectoral girdle other than the main two flight muscles. [PDF]
J AnatThis report explores which muscles of the pectoral girdle are employed to allow birds to hold their wings horizontally with a level aerofoil surface during a glide. Abstract Whilst many birds glide briefly with wings held horizontally, some species maintain this posture for extended periods during soaring.
Deeming DC, Mosto MC.
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Frontiers in Cellular and Infection Microbiology, 2022 Aspergillosis remains difficult to diagnose in animals. Laboratory-based assays are far less developed than those for human medicine, and only few studies have been completed to validate their utility in routine veterinary diagnostics.
Guillaume Desoubeaux +4 more
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Skeletal elements of the penguin eye and their functional and phylogenetic implications (Aves: Sphenisciformes: Spheniscidae) [PDF]
Journal of Morphology, 2021 Abstract Scleral ossicles and other bony elements are present in the eyes of many vertebrates, including birds. In this study, the skeletal elements present in the penguin eye and orbit were imaged using macro photographs and micro‐computed tomography (micro‐CT), to help elucidate their function and significance ...
Peter W. Hadden +3 more
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Multiple sex chromosome system in penguins (Pygoscelis, Spheniscidae)
Comparative Cytogenetics, 2017 Penguins are classified in the order Sphenisciformes into a single family, Spheniscidae. The genus Pygoscelis Wagler, 1832, is composed of three species, Pygoscelis antarcticus Forster, 1781, P. papua Forster, 1781 and P.
Ricardo José Gunski +6 more
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Multiple cenozoic invasions of Africa by penguins (Aves, Sphenisciformes) [PDF]
Proceedings of the Royal Society B: Biological Sciences, 2011 Africa hosts a single breeding species of penguin today, yet the fossil record indicates that a diverse array of now-extinct taxa once inhabited southern African coastlines. Here, we show that the African penguin fauna had a complex history involving multiple dispersals and extinctions.
Daniel T, Ksepka, Daniel B, Thomas
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The probable association of feather mites of the genus Ingrassia (Analgoidea: Xolalgidae) with the blue penguin Eudyptula minor (Aves: Sphenisciformes) in Australia. [PDF]
, 2008 A new feather mite species, Ingrassia eudyptula n. sp. (Xolalgidae: Ingrassiinae), is described from the blue penguin Eudyptula minor (J. B. Forster, 1781) in Australia.
Proctor, H.C., Mironov, S.V.
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Helminths of the Magellanic penguin, Spheniscus magellanicus (Sphenisciformes), during the breeding season in Patagonian coast, Chubut, Argentina [PDF]
, 2010 Twenty-seven Magellanic penguins, Spheniscus magellanicus (Sphenisciformes), were collected from September 1996 to November 2000 from Península Valdés (42°04′42°53′S; 63°38′-64°30′W), on the Patagonian coast, Argentina and the gastrointestinal tract was ...
Graciela T. Navone +5 more
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