Osteoderms of<i>Simosuchus clarki</i>(Crocodyliformes: Notosuchia) from the Late Cretaceous of Madagascar

Hill, Robert V.

doi:10.1080/02724634.2010.518110

Cited by 54 publications

(51 citation statements)

References 43 publications

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“…Marinho et al (2006) do not report osteoderms of the nuchal shield in their description of the osteoderms of Peirosaurus tormini and Uberabasuchus terrificus. However, Hill (2014) reports the existence of the shield in Simosuchus clarki, inferring that the osteoderms of this set do not have the convex characteristic in axial view to completely cover the epaxial muscles of the neck. The deep surfaces of the nuchal osteoderms of Simosuchus are flattened and slightly depressed below the keel.…”

Section: Discussionmentioning

confidence: 95%

“…According to Hill (2014), these all have the form of an irregular discoid polygon and closely contact the adjacent osteoderms. The surface ornamentation of the pectoral osteoderms matches the pattern observed in gastral osteoderms.…”

Section: Discussionmentioning

confidence: 98%

“…According to Hill (2014), the dorsal shield osteoderms of Simosuchus have quadrilateral shapes. The shield is paravertebral open with osteoderms arranged in two pairs of parasagittal lines (tetraserial).…”

Section: Discussionmentioning

confidence: 99%

“…3). Hill (2014) used the same subdivision for dividing the osteoderms of Simosuchus clarki described by Buckley et al (2000). The shape, the external ornamentation (external articular facet, tubercles, alveolar sculpture, keel position, grooves), and the deep ornamentation (grooves, foramina and deep articular facet) are described following the methodology of Marinho et al (2006) (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Osteoderms of Montealtosuchus arrudacamposi (Crocodyliformes, Peirosauridae) from the Turonian-Santonian (Upper Cretaceous) of Bauru Basin, Brazil

Tavares

Ricardi-Branco

Carvalho

2015

Cretaceous Research

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Osteoderms of Montealtosuchus arrudacamposi (Crocodyliformes, Peirosauridae) from the Turonian-Santonian (Upper Cretaceous) of Bauru Basin, Brazil

Tavares

Ricardi-Branco

Carvalho

2015

Cretaceous Research

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“…The armor pattern on well preserved crocodyliform specimens can demonstrate some variation in osteoderm morphology (shape, pattern, keel orientation) from one part of the skeleton to another, particularly with regard to the tail or gastral region versus the dorsal and cervical armor (e.g., Wu et al, 1996;Sereno et al, 2001;Figueieredo et al, 2011;Schwarz et al, 2006;Hill, 2010). So we might expect some variation in the armor pattern for Deinosuchus.…”

Section: Identificationmentioning

confidence: 94%

First report of a giant neosuchian (Crocodyliformes) in the Williams Fork Formation (Upper Cretaceous: Campanian) of Colorado

Foster¹,

Hunt-Foster

2015

Cretaceous Research

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Bone Histology of Phytosaur, Aetosaur, and Other Archosauriform Osteoderms (Eureptilia, Archosauromorpha)

Scheyer

Desojo

Cerda

2013

The Anatomical Record

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As in other archosauriforms, phytosaurs and aetosaurs are characterized by the presence of well-developed osteoderms. Here we provide a comparative study on the microstructure of phytosaur (five taxa) and aetosaur (thirteen taxa) osteoderms. For outgroup comparison, we sampled osteoderms of the sister taxon to Aetosauria, Revueltosaurus callenderi, and the doswelliid Jaxtasuchus salomoni. Phytosaur, aetosaur, and Jaxtasuchus osteoderms are composed of a diploe structure, whereas the Revueltosaurus osteoderm microanatomy is more compact. The external cortex of phytosaurs, Revueltosaurus and Jaxtasuchus osteoderms is mainly composed of parallelfibered bone. In aetosaurs, the external cortex mainly consists of lamellar bone, with lines of resorption within the primary bone indicating successive cycles of bone erosion and deposition. The basal cortex in all the specimens is composed of parallel-fibered bone, with the cancellous internal core being more strongly developed in aetosaurs than in phytosaurs. Woven or fibro-lamellar bone was recorded in both phytosaurian and aetosaurian taxa, as well as in Jaxtasuchus. Structural fibers, which at least partly suggest metaplastic origin, were only recorded in the internal core of two phytosaurs and in the basal cortex of one aetosaur. Osteoderm thickness and cancellous to compact bone ratios appear to be subject to ontogenetic change. Minimum growth mark counts in osteoderms sampled indicate that some aetosaurs and phytosaurs lived for at least two decades. Bone microstructures are more uniform in phytosaur osteoderms and show a higher level of disparity among aetosaur osteoderms, and at least in the latter, histological features are potentially apomorphic for species/genus level. Anat Rec, 297:240-260, 2014. V C 2013 Wiley Periodicals, Inc.

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Osteoderms ofSimosuchus clarki(Crocodyliformes: Notosuchia) from the Late Cretaceous of Madagascar

Cited by 54 publications

References 43 publications

Osteoderms of Montealtosuchus arrudacamposi (Crocodyliformes, Peirosauridae) from the Turonian-Santonian (Upper Cretaceous) of Bauru Basin, Brazil

Osteoderms of Montealtosuchus arrudacamposi (Crocodyliformes, Peirosauridae) from the Turonian-Santonian (Upper Cretaceous) of Bauru Basin, Brazil

First report of a giant neosuchian (Crocodyliformes) in the Williams Fork Formation (Upper Cretaceous: Campanian) of Colorado

Bone Histology of Phytosaur, Aetosaur, and Other Archosauriform Osteoderms (Eureptilia, Archosauromorpha)

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