Osteohistology of hyperodapedontine rhynchosaurs (Diapsida, Archosauromorpha) from the Upper Triassic of Southern Brazil.

Veiga, Fábio Hiratsuka; Soares, Marina Bento; Sayão, Juliana Manso

doi:10.4202/app.00074.2014

Cited by 8 publications

(17 citation statements)

References 30 publications

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“…In the Kupferzell locality, fluctuating growth marks in the temnospondyl Gerrothorax pulcherrimus have been interpreted as evidence for unstable environmental parameters (Witzmann et al, 2012) so that the fast growth rates present in Batrachotomus may have been an advantage to an apex predator niche in the ecosystem (Both-Brink et al, 2016). Thus, besides phylogenetic constraints, the bone tissue of Batrachotomus probably includes an adaptational signal, as was suggested several times before (Ricql es et al, 2003(Ricql es et al, , 2008BothaBrink and Smith, 2011;Veiga et al, 2015).…”

Section: Discussionmentioning

confidence: 60%

“…Data on archosauromorphs, archosauriforms, and pseudosuchian archosaurs, however, are still rare (and less well understood) but so far show a variety of bone tissues and vascular systems, resulting in a mixture of bone tissue patterns (Botha-Brink and Smith, 2011). The primary bone tissue type of non-ornithodiran archosauromorphs can be characterized (with a few exceptions, see below) as lamellar-zonal bone tissue type/LZB (Ricql es et al, 2003(Ricql es et al, , 2008Botha-Brink and Smith, 2011;Werning and Irmis, 2011;Ezcurra et al, 2014;Mukherjee, 2015;Veiga et al, 2015;Werning and Nesbitt, 2016). Differences with modern reptiles that also grow with LZB are mainly related to vascularity (density and organization) and a higher organization of tissue.…”

Section: Discussionmentioning

confidence: 99%

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Preliminary observations on the bone histology of the Middle Triassic pseudosuchian archosaurBatrachotomus kupferzellensisreveal fast growth with laminar fibrolamellar bone tissue

Klein

Foth

Schoch

2017

Journal of Vertebrate Paleontology

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ABSTRACT-The bone tissue of femur, rib, and gastralia from three different individuals of the Middle Triassic pseudosuchian Batrachotomus kupferzellensis from southern Germany is studied. The femoral bone tissue comprises laminar fibrolamellar bone tissue throughout and is stratified by three annual growth cycles, indicating that the individual died early in its fourth year of life, at which time it had reached 87% of maximum known femur length. Thus, compared with most other Pseudosuchia (e.g., phytosaurs, aetosaurs, and most crocodylomorphs, including marine taxa), Batrachotomus achieved its large body size in a very short time by fast, although interrupted, growth and not by protracted longevity. Such fast growth as well as the organization of the tissue is similar to the condition observed in ornithodirans. The pseudosuchians Effigia and Postosuchus also show fibrolamellar tissue, but vascular density is lower when compared with Batrachotomus and dominated by a longitudinal organization of primary osteons. The rib and gastralium of Batrachotomus both show an inner spongious organization surrounded by a ring of compact, avascular, highly organized parallel-fibered and/or lamellar bone largely covered by short fibers. Maximal growth cycle count in the proximal rib sample suggests an age of at least 11 years for this individual with a reduction of growth rate after the sixth cycle.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Preliminary observations on the bone histology of the Middle Triassic pseudosuchian archosaurBatrachotomus kupferzellensisreveal fast growth with laminar fibrolamellar bone tissue

Klein

Foth

Schoch

2017

Journal of Vertebrate Paleontology

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“…The bone histology of non-archosaurian archosauromorphs has received great attention in the last decade (Ricqlès et al 2008; Nesbitt et al 2009; Botha-Brink and Smith 2011; Werning and Irmis 2011; Legendre et al 2013, 2016; Ezcurra et al 2014; Mukherjee 2015; Veiga et al 2015; Werning and Nesbitt 2016; Jaquier and Scheyer 2017). Ricqlès et al (2008) suggested that the capacity of reaching and maintaining very high bone growth rates is an apomorphic feature of archosauriforms.…”

Section: Introductionmentioning

confidence: 99%

Bone histology of Azendohsaurus laaroussii: Implications for the evolution of thermometabolism in Archosauromorpha

Cubo

Jalil

2019

Paleobiology

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This paper is aimed at constraining the phylogenetic frame of the acquisition of endothermy by Archosauromorpha. We analyzed the bone histology of Azendohsaurus laaroussii. Stylopodial and zeugopodial bones show three tissue types: (1) avascular lamellar zonal bone formed at low growth rates; (2) a scaffold of parallel-fibered bone containing either small primary osteons or simple vascular canals; and (3) fibrolamellar bone formed at high growth rates. We used quantitative histology to infer the thermometabolic regime of this taxon. We define endothermy as the presence of any mechanism of nonshivering thermogenesis that increases both body temperature and resting metabolic rate. Thus, estimating the resting metabolic rate of an extinct organism may be a good proxy to infer its thermometabolic regime (endothermy vs. ectothermy). High resting metabolic rates have been shown to be primitive for the clade Prolacerta–Archosauriformes. Therefore, we inferred the resting metabolic rates of A. laaroussii, a sister group of this clade, and of 14 extinct related taxa, using phylogenetic eigenvector maps. All the inferences obtained are included in the range of variation of resting metabolic rates measured in mammals and birds, so we can reasonably assume that all these taxa (including Azendohsaurus) were endotherms. A parsimony optimization of the presence of endothermy on a phylogenetic tree of tetrapods shows that this derived character state was acquired by the last common ancestor of the clade Azendohsaurus–Archosauriformes and that there is a reversion in Crocodylia.

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“…Recently, Veiga et al . (in press) examined the available long bone microstructure of the Late Triassic hyperodapedontines, Teyumbaita sulcognathus and Hyperodapedon sp., and showed that hyperodapedontines had faster initial growth in comparison with the latter.…”

mentioning

confidence: 99%

New insights from bone microanatomy of the Late Triassic Hyperodapedon (Archosauromorpha, Rhynchosauria): implications for archosauromorph growth strategy

Mukherjee

2015

Palaeontology

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Bone microanatomy of multiple postcranial skeletal elements of several individuals of Hyperodapedon collected from India is reported. This reveals that fibrolamellar bone tissue is predominant in the mid-and inner cortices, whereas the peripheral region of the cortex is composed of either parallel-fibred and/or lamellar bone. The pattern of primary osteons mostly ranges between laminar and subplexiform. Such predominance of fibrolamellar bone tissue in the cortex suggests an overall fast growth, which slowed down considerably later in ontogeny. Four distinct ontogenetic stages are identified based on the bone microstructure. During the juvenile stage, growth was fast and continuous, but it became punctuated during the early and late sub-adult stages. In adult individuals, growth was slow and showed periodic interruption but did not stop completely, suggesting that Hyperodapedon had an indeterminate growth strategy. Interelemental histovariations affecting cortical thickness, organization of the vascular network, incidence of growth rings and extent of secondary reconstruction are noted.

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Osteohistology of hyperodapedontine rhynchosaurs (Diapsida, Archosauromorpha) from the Upper Triassic of Southern Brazil.

Abstract: The first osteohistological study focused exclusively on rhynchosaurs (non-archosauriform archosauromorphs), based on the hyperodapedontines

Cited by 8 publications

References 30 publications

Preliminary observations on the bone histology of the Middle Triassic pseudosuchian archosaurBatrachotomus kupferzellensisreveal fast growth with laminar fibrolamellar bone tissue

Preliminary observations on the bone histology of the Middle Triassic pseudosuchian archosaurBatrachotomus kupferzellensisreveal fast growth with laminar fibrolamellar bone tissue

Bone histology of Azendohsaurus laaroussii: Implications for the evolution of thermometabolism in Archosauromorpha

New insights from bone microanatomy of the Late Triassic Hyperodapedon (Archosauromorpha, Rhynchosauria): implications for archosauromorph growth strategy

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