Long bone microstructure gives new insights into the life of pachypleurosaurids from the Middle Triassic of Monte San Giorgio, Switzerland/Italy

Hugi, Jasmina; Scheyer, Torsten M.; Sander, P. Martin; Klein, Nicole; Sánchez‐Villagra, Marcelo R.

doi:10.1016/j.crpv.2011.03.009

Cited by 31 publications

(59 citation statements)

References 34 publications

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“…For comparison, bone compactness is between 95.5 and 89.6 % in Dactylosaurus, between 95.6 and 84.7 % in aff. N. pusillus from southern Germany, and is always over 90 %, usually even over 95 % in pachypleurosaurs from the Alpine Triassic (Table 1; Hugi et al, 2011), clearly documenting bone mass increase (i.e., osteosclerosis) in these taxa. In all pachypleurosaurs vascularization is dominated by longitudinal and radial vascular canals.…”

Section: Comparison Of Microanatomy Bone Tissue and Vascularizationmentioning

confidence: 99%

“…Neusticosaurus pusillus and N. peyeri reached sexual maturity at an age between 3 and 4 and died between 7 and 10 years (Sander, 1990). The onset of sexual maturity started in N. edwardsii between the 4th and 7th year, and it reached ages older than 15 years (Hugi et al, 2011). Anarosaurus shows a much faster growth rate due to growing with a different bone tissue and vascular pattern when compared to Neusticosaurus and Serpianosaurus (Klein, 2010).…”

Section: N Klein and E M Griebeler: Growth Modeling In Pachypleuromentioning

confidence: 99%

“…Pachypleurosaurs from the Alpine Triassic also display bone mass increase. They either have a very small cavity surrounded by a thick layer of endosteal bone, a medullary region filled with endosteal bone, or a medullary region that is filled by endosteal bone and small erosion cavities at its border (Hugi et al, 2011). In Anarosaurus, the large medullary cavity is lined by a thin layer of endosteal bone (except for the smallest humerus Wijk06-238) but no filling up of the cavity is documented.…”

Section: Comparison Of Microanatomy Bone Tissue and Vascularizationmentioning

confidence: 99%

“…Bone histological studies of midshaft regions in long bones (humeri and femora) of pachypleurosaur taxa (Sander, 1990;Klein, 2010Klein, , 2012Hugi et al, 2011) revealed important information on their life history: Serpianosaurus reached sexual maturity in its 2nd or 3rd year of life, and the oldest individual died in its 14th year (Hugi et al, 2011). Neusticosaurus pusillus and N. peyeri reached sexual maturity at an age between 3 and 4 and died between 7 and 10 years (Sander, 1990).…”

Section: N Klein and E M Griebeler: Growth Modeling In Pachypleuromentioning

confidence: 99%

“…Additionally, Neusticosaurus (N. pusillus and N. edwardsii) and Serpianosaurus from the Alpine Triassic were included in our study as well. Samples are taken from the studies of Sander (1990) and of Hugi et al (2011). Histological and life-history data were compiled from these publications but thin sections of these taxa were also studied first hand.…”

Section: Aimmentioning

confidence: 99%

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Growth patterns, sexual dimorphism, and maturation modeled in Pachypleurosauria from Middle Triassic of central Europe (Diapsida: Sauropterygia)

Klein

Griebeler

2018

Foss. Rec.

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Section: Comparison Of Microanatomy Bone Tissue and Vascularizationmentioning

confidence: 99%

Section: N Klein and E M Griebeler: Growth Modeling In Pachypleuromentioning

confidence: 99%

Section: Comparison Of Microanatomy Bone Tissue and Vascularizationmentioning

confidence: 99%

Section: N Klein and E M Griebeler: Growth Modeling In Pachypleuromentioning

confidence: 99%

Section: Aimmentioning

confidence: 99%

See 3 more Smart Citations

Growth patterns, sexual dimorphism, and maturation modeled in Pachypleurosauria from Middle Triassic of central Europe (Diapsida: Sauropterygia)

Klein

Griebeler

2018

Foss. Rec.

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Bone Histology of the Stegosaur Kentrosaurus aethiopicus (Ornithischia: Thyreophora) from the Upper Jurassic of Tanzania

Redelstorff

Hübner

Chinsamy

et al. 2013

The Anatomical Record

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Using bone histology, a slow growth rate, uncommon for most dinosaurs, has been interpreted for the highly derived stegosaur Stegosaurus (Ornithischia: Thyreophora) and the basal thyreophoran Scutellosaurus. In this study, we examine whether this slow growth rate also occurs in the more basal stegosaur Kentrosaurus from the Tendaguru beds of Tanzania. The bone histology of six femora of Kentrosaurus representing an ontogenetic series from subadult to adult was studied, as well as one scapula. The primary bone is mainly highly vascularized fibro-lamellar bone with some reticular organization of the vascular canals. In addition to LAGs and annuli, distinctive shifts in the pattern of vascularization occur, which have been interpreted as potential growth marks. The variation in the development of growth marks may reflect annual climatic fluctuations. The overall bone depositional rate, and hence growth rate in Kentrosaurus appears to be higher than in Stegosaurus and Scutellosaurus. Considering that Stegosaurus is the larger-sized of the two stegosaurs, this would be contrary to an earlier supposition that small-bodied dinosaurs have slower growth rates than larger ones. Our finding of rapid rates of bone deposition in Kentrosaurus suggests that slow growth rates previously reported in Scutellosaurus and Stegosaurus are not a phylogenetic characteristic of the Thyreophora. Thus, slow growth rates are not plesiomorphic for the Thyreophora. We propose that the slow growth rates documented in the highly derived Stegosaurus could have been secondarily derived or alternatively that Kentrosaurus is the exception having increased growth rates. Anat Rec, 296:933-952, 2013

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Microstructure of Vertebrae, Ribs, and Gastralia of Triassic Sauropterygians—New Insights into the Microanatomical Processes Involved in Aquatic Adaptations of Marine Reptiles

Klein

Canoville

Houssaye³

2019

The Anatomical Record

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Isolated ribs and vertebrae of Middle Triassic sauropterygians are studied. The vertebrae have a well‐defined large cavity in their centra, which is a unique feature and is without any modern analogue. The articular facets of vertebrae are made of endochondral bone including calcified as well as uncalcified cartilage. Vertebrae are pachyosteosclerotic in the pachypleurosaurs Neusticosaurus and Serpianosaurus from the Alpine Triassic, and osteosclerotic in the placodont, in the medium‐sized Nothosaurus marchicus, and in the pachypleurosaur Anarosaurus. In large Nothosaurus specimens, the vertebrae are cavernous. The ribs of all sampled specimens are osteosclerotic, which resembles the microanatomy of long bones in all studied taxa. The proximal to medial part of ribs mainly consists of a compact periosteal cortex surrounding an inner endosteal territory. Toward the distal end of the ribs, the periosteal thickness decreases whereas the endosteal territory increases. Despite a shift from periosteal versus endosteal tissues, global rib compactness remains relatively constant. Osteosclerosis in ribs and vertebrae is reached by the same processes as in the long bones: by a relative increase in cortex thickness that is coupled by a reduction of the medullary cavity, by the persistence of calcified cartilage, and by an inhibition of remodeling although some resorption may occur but without complete redeposition of bone. Processes differ from those observed in Permian marine reptiles and some mosasaurines, where either extensive remodeling or inhibition of bone resorption leads to osteosclerosis. Besides differences regarding the microanatomy, all studied bones of a taxon are consistent in their bone tissue type. Anat Rec, 302:1770–1791, 2019. © 2019 American Association for Anatomy

show abstract

Long bone microstructure gives new insights into the life of pachypleurosaurids from the Middle Triassic of Monte San Giorgio, Switzerland/Italy

Cited by 31 publications

References 34 publications

Growth patterns, sexual dimorphism, and maturation modeled in Pachypleurosauria from Middle Triassic of central Europe (Diapsida: Sauropterygia)

Growth patterns, sexual dimorphism, and maturation modeled in Pachypleurosauria from Middle Triassic of central Europe (Diapsida: Sauropterygia)

Bone Histology of the Stegosaur Kentrosaurus aethiopicus (Ornithischia: Thyreophora) from the Upper Jurassic of Tanzania

Microstructure of Vertebrae, Ribs, and Gastralia of Triassic Sauropterygians—New Insights into the Microanatomical Processes Involved in Aquatic Adaptations of Marine Reptiles

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