Evolution of Avian Ontogenies

Starck, J. Matthias

doi:10.1007/978-1-4615-9582-3_6

Cited by 173 publications

(212 citation statements)

References 92 publications

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“…We also recognize that the developmental pathways that lead to a superficial morphotype may have changed through time and in clade-specific ways. Furthermore, a majority of recent research on living birds focuses on embryological development 4,5,[14][15][16][17][18] , which is poorly known for extinct taxa. However, a review of literature dating back over a century creates the basis for comparison with enantiornithines 5,6,8,13,14,16,19 .…”

Section: Discussionmentioning

confidence: 99%

Insight into the early evolution of the avian sternum from juvenile enantiornithines

et al. 2012

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The sternum is one of the most important and characteristic skeletal elements in living birds, highly adapted for flight and showing a diverse range of morphologies. new exceptional material of young juvenile specimens from the Early Cretaceous Jehol Group in northeastern China reveals the unique sequence of development in the sternum of Enantiornithes, the dominant clade of Cretaceous birds. We recognize six ossifications that together form the sternum, three of which were previously unknown. Here we show that although basal living birds apparently have retained the dinosaurian condition in which the sternum develops from a bilateral pair of ossifications (present in paravian dinosaurs and basal birds), the enantiornithine sternal body primarily develops from two unilateral proximo-distally arranged ossifications. This indicates that although superficially similar, the sternum formed very differently in enantiornithines and ornithuromorphs, suggesting that several ornithothoracine sternal features may represent parallelism. This highlights the importance of ontogenetic studies for understanding homology and the evolution of skeletal features in palaeontology.

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Section: Discussionmentioning

confidence: 99%

Insight into the early evolution of the avian sternum from juvenile enantiornithines

et al. 2012

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“…The chicken is clearly a precocial species, whereas the barn owl is classified as altricial by most authors (reviewed in Starck, 1993). Altricial and precocial refer to the developmental stage of the hatchling (review in Starck and Ricklefs, 1998).…”

Section: Discussion Embryo Staging In Altricial Vs Precocial Speciesmentioning

confidence: 99%

Embryonic and posthatching development of the barn owl (Tyto alba): Reference data for age determination

Köppl

Futterer

Nieder

et al. 2005

Developmental Dynamics

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“…Although comparisons with Aves are complicated by the fact that the precise embryonic stage of IGM 100/971 is unknown and that in some instances its incompleteness may reflect preservational instead of ontogenetic factors, the observed degree of ossification of this fossil embryo at least falls toward the higher end of the spectrum observed for Aves very close to parturition. Ossified and well-defined ends of bones, such as the scapula, appear not to be present in living precocial hatchlings (Starck, 1993(Starck, , 1994. In fact, most living hatchlings remain largely cartilaginous and poorly ossified, although it is known that the amount of ossification is greater in Aves with a precocial rather than an altricial mode of development (Starck, 1993(Starck, , 1994Starck and Ricklefs, 1998).…”

Section: Patterns Of Ossification and Develop-mental Strategiesmentioning

confidence: 99%

“…Ossified and well-defined ends of bones, such as the scapula, appear not to be present in living precocial hatchlings (Starck, 1993(Starck, , 1994. In fact, most living hatchlings remain largely cartilaginous and poorly ossified, although it is known that the amount of ossification is greater in Aves with a precocial rather than an altricial mode of development (Starck, 1993(Starck, , 1994Starck and Ricklefs, 1998). For example, Starck (1994) calculated that the osseous mass of a precocial hatchling of Barred Buttonquail (Turnix NO.…”

Section: Patterns Of Ossification and Develop-mental Strategiesmentioning

confidence: 99%

An Embryonic Oviraptorid (Dinosauria: Theropoda) from the Upper Cretaceous of Mongolia

Norell¹,

Clark²,

Chiappe³

2001

American Museum Novitates

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An embryonic oviraptorid skeleton is described within an egg from the Late Cretaceous Djadokha Formation of Ukhaa Tolgod, Mongolia. The specimen comprises the ventral part of the skull and most of the mandible, a poorly preserved axial skeleton missing most of the tail, and portions of the forelimbs, shoulder girdles, pelvis, and hindlimbs. The skull is readily referable to the theropod dinosaur clade Oviraptoridae on the basis of several skull specializations (edentulous, vertically oriented premaxilla, a sinusoidally shaped lower jaw, and an unusual articulation of the vomer and premaxilla), and the postcranial skeleton is consistent with this identification. The egg is equivalent in overall shape and microstructure to those found beneath several oviraptorid skeletons recovered from the same formation. The skeleton is well ossified and, in comparison with ossification patterns in living Aves, the evidence suggests that this species was closer to the precocial end of the precocial-altricial spectrum of developmental patterns.

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Evolution of Avian Ontogenies

Cited by 173 publications

References 92 publications

Insight into the early evolution of the avian sternum from juvenile enantiornithines

Insight into the early evolution of the avian sternum from juvenile enantiornithines

Embryonic and posthatching development of the barn owl (Tyto alba): Reference data for age determination

An Embryonic Oviraptorid (Dinosauria: Theropoda) from the Upper Cretaceous of Mongolia

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