Skull morphology and ontogenetic variation of the Southern Giant Petrel Macronectes giganteus (Aves: Procellariiformes)

Piro, Alejandra; Hospitaleche, Carolina Acosta

doi:10.1007/s00300-018-2397-z

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…At last, fusion appears in the facial region, zygomatic arch, skull roof and around the splenial. Similar patterns have been previously documented for Dromaius novaehollandiae (Palaeognathae), Gallus gallus (Galloanserae), Aptenodytes forsteri, Macronectes giganteus (both Aequorlitornithes) and Myiopsitta monachus (Inopinaves) (Jollie, 1957;Bailleul et al, 2016;Sosa and Hospitaleche, 2018;Piro and Hospitaleche, 2019;Carril et al, 2020), indicating a highly constrained development among birds. Based on this comparison, we see a common fusion trend from posterior to anterior and from ventral to dorsal.…”

Section: Ontogenetic Changes Of Sutural Characterssupporting

confidence: 83%

“…As adult birds show in general an extreme degree of bone fusion in the skull (Jollie, 1957;Plateau and Foth, 2020), the process of sutural closure may provide another potential proxy for the identification of postnatal ontogenetic stages (Rager et al, 2013;Bailleul et al, 2016). Several case studies already described patterns of sutural closure in a handful of birds, e.g., Gallus gallus (Jollie, 1957), Macronectes giganteus (Piro and Hospitaleche, 2019), Aptenodytes forsteri (Sosa and Hospitaleche, 2018), Casuarius casuarius (Green and Gignac, 2020), Myiopsitta monachus (Carril et al, 2020), and Dromaius novaehollandiae (Bailleul et al, 2016). According to Bailleul et al (2016), the progressive nature of the sutural closure, allows identifying different ontogenetic stages.…”

Section: Introductionmentioning

confidence: 99%

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Common Patterns of Skull Bone Fusion and Their Potential to Discriminate Different Ontogenetic Stages in Extant Birds

Plateau

Foth

2021

Front. Ecol. Evol.

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The degree of sutural closure between bones generally allows for the classification of skeleton maturity in tetrapods. In mammals, the sutural closure of skull bones was previously used as proxy to evaluate the ontogenetic stage of single individuals. However, due to temporal variation, this process can be only applied among mammalian subclades, but not for all mammals in general. In contrast, the process of sutural closures in bird skulls could be a more reliable ontogenetic proxy for this clade as adult birds commonly show a generally high degree of bone fusion. To test this, we studied the process of sutural closure in ontogenetic series of 18 extant bird species regarding the presence of an ontogenetic signal and compared the results with changes in skull size and proportions. Univariate analyses indicate that bone fusion happens faster in altricial than in precocial birds. However, the use of PCoA and multivariate regressions reveal that the skull bone fusion follows a common pattern among birds and thus can be used as proxy to identify different ontogenetic stages. In general, the process of sutural closure spreads from posterior to anterior and from ventral to dorsal. In contrast, skull measurements reflect rather interspecific allometry than ontogeny. The used of bone fusion as proxy will help to better identify and compare different stages of maturation in birds, including historical material from osteological collections.

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Section: Ontogenetic Changes Of Sutural Characterssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Common Patterns of Skull Bone Fusion and Their Potential to Discriminate Different Ontogenetic Stages in Extant Birds

Plateau

Foth

2021

Front. Ecol. Evol.

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“…In these birds, the bone has a subrectangular shape, broadly contacts the frontal, and extends well beyond the suture between parietal and frontal (Figure 3b,c). The squamosal also surpasses the parietal in the Opisthocomidae (Figure 4k), Diomedeidae (Zusi & Livezey, 2006, figure 4b), Procellariidae (Figure 4b; see also Piro & Hospitaleche, 2019), Pelecanidae (Figure 4h), Coliidae (Figure 6d), Bucerotidae (Figure 6e,f), Upupidae (Figure 6g), and the strigiform taxon Athene (Figure 6c).…”

Section: Resultsmentioning

confidence: 96%

“…Abbreviations: frt, frontal; lts, laterosphenoid; squ, squamosal; par, parietal; ppo, processus postorbitalis; qdr, quadrate. Scale bars equal 10 mm; (l) is not to scale see also Piro & Hospitaleche, 2019), Pelecanidae (Figure 4h), Coliidae (Figure 6d), Bucerotidae (Figure 6e,f), Upupidae (Figure 6g), and the strigiform taxon Athene (Figure 6c).…”

Section: Resultsmentioning

confidence: 99%

On the comparative morphology of the juvenile avian skull: An assessment of squamosal shape across avian higher‐level taxa

Mayr

Manegold

2020

The Anatomical Record

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The comparative morphology of juvenile avian skulls is poorly known. Here, we survey the shape of the squamosal (os squamosum) across juvenile skulls of avian higher‐level clades. In all palaeognathous birds, the rostral end of the squamosal does not surpass the parietal and does not reach the frontal. This morphology is likely to be plesiomorphic for neornithine birds. A short squamosal also occurs in some Neognathae, but in most neognathous birds the squamosal contacts the frontal, and in some taxa the bone is strongly elongated and distinctly surpasses the parietal. Some clades show a notable variation in squamosal morphology. This is, for example, true for Strigiformes, where the taxon Athene differs from the other examined owls in squamosal size, and for the Passeriformes, where Old World Suboscines are characterized by a distinctive squamosal morphology. A unique derived squamosal morphology is for the first time reported for the Apodidae and Hemiprocnidae, in which the bone forms a elongated rostral process that runs along most of the orbital rim. In non‐avian theropods, the squamosal articulates with the postorbital and delimits the upper temporal opening. Extant birds lack a postorbital, but a topological correlation between the squamosal and the postorbital process is maintained in most taxa of the Neognathae. The phylogenetic significance of squamosal morphology is diminished by the fact that closely related taxa often show very disparate shapes of the bone, and squamosal morphology appears to be determined by multiple functional constraints including skull geometry, brain morphology and, possibly, nostril type.

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“…2016; Mathews & Samonds 2016; Blanco et al . 2018; Piro & Hospitaleche 2019). The phytosaur individuals were then categorized as skeletally immature or juvenile (<60% of adult/full size), transitional or sub‐adult (60–80% of adult size), or skeletally mature or adult (>80% of adult size) based on the present‐day gharials ( Gavialis gangeticus ; Rao et al .…”

Section: Methodsmentioning

confidence: 99%

A giant phytosaur (Diapsida, Archosauria) from the Upper Triassic of India with new insights on phytosaur migration, endemism and extinction

Datta

Ray

2023

Papers in Palaeontology

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A new Mystriosuchinae phytosaur, Colossosuchus techniensis, is described from the Upper Triassic Tiki Formation of India. Colossosuchus is diagnosed by multiple apomorphies, including a strongly downturned terminal rosette (c. 70°), closely spaced mediolateral band-like ornamentation on dorsal surface of the nasal, dorsolaterally oriented supratemporal fenestra, ventrolaterally inclined postorbital-squamosal bars depressed below the skull table, dorsally convex parietal-squamosal bar that descends ventrolaterally below the skull roof, dome-shaped skull in lateral view, prominent neural arch laminae and fossae, three sacral vertebrae, robust proximal end of the tibia, and fibula with high anteroposterior flaring of the distal end. The total body length of the largest individual recovered from the bonebed is estimated to be more than 8 m, suggesting that Colossosuchus is one of the largest phytosaurs known. Phylogenetic analysis nests Colossosuchus and other undescribed specimens from India within Mystriosuchinae.These form a distinct clade and represent the earliest record of endemism among Gondwanan phytosaurs. This clade is recovered as sister taxa to ((Volcanosuchus + Rutiodon) + Leptosuchomorpha), where the depressed supratemporal fenestra first appeared in the phytosaur lineage, a feature previously used to diagnose the derived leptosuchomorphs. Early-diverging phytosaur diversification may have coincided with the final stages of the Carnian Pluvial Event with their possible migratory routes along the circum-Tethyan coastline. The lineage continued to evolve mostly through endemic radiations and experienced an extinction event during early Norian, which marked the disappearance of most of the non-leptosuchomorph taxa. This is attributed to post-CPE aridification, although more study is required.

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Skull morphology and ontogenetic variation of the Southern Giant Petrel Macronectes giganteus (Aves: Procellariiformes)

Cited by 10 publications

References 14 publications

Common Patterns of Skull Bone Fusion and Their Potential to Discriminate Different Ontogenetic Stages in Extant Birds

Common Patterns of Skull Bone Fusion and Their Potential to Discriminate Different Ontogenetic Stages in Extant Birds

On the comparative morphology of the juvenile avian skull: An assessment of squamosal shape across avian higher‐level taxa

A giant phytosaur (Diapsida, Archosauria) from the Upper Triassic of India with new insights on phytosaur migration, endemism and extinction

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