Osteoderm histology of Late Pleistocene cingulates from the intertropical region of Brazil

Pereira, Paulo Victor Luiz Gomes da Costa; Victer, Gustavo Duarte; Porpino, Kleberson de Oliveira; Bergqvist, Lílian Paglarelli

doi:10.4202/app.2011.0117

Cited by 9 publications

(18 citation statements)

References 17 publications

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“…The specimens from the dorsal region of the Glyptotherium sp. studied here (MCC 1234-V, MCC 2601-V, MCC 2579-V, MCC 2092-V) are similar to those analysed by Pereira et al (2014), which are also from the same region of the carapace and study location (Lajedo da Escada). The specimens evaluated here show, in their deep layer of compact bone, fibre bundles with dominantly parallel alignment, some primary and secondary osteons, a central region with several resorption areas and several osteocytes and secondary osteons; in addition, their superficial layer of compact bone shows fibre bundles with parallel alignment and some osteocytes and osteons.…”

Section: Discussionsupporting

confidence: 77%

“…All osteoderms evaluated in this paper present a "diplöelike" structure, which consists of a central region of trabecular bone sandwiched between superficial and deep layers of compact bone, as in other previously described osteoderms of cingulates (e.g. Hill, 2006;Wolf, 2007;Wolf et al, 2012;Pereira et al, 2014;Asakura et al, 2017). In addition, we noted that the specimens studied present extensive bone remodelling, which seems a remarkable characteristic of glyptodont osteoderms (Wolf, 2007).…”

Section: Discussionsupporting

confidence: 76%

“…For the histological description of the osteoderms, we follow the terminology employed by Hill (2006), Wolf et al (2012) and Pereira et al (2014). All of these studies agree that the cingulate osteoderms present a general "diplöe-like" structure, which consists of a central region of trabecular bone positioned between a superficial and a deep layer of compact bone ( Figure 2C).…”

Section: Terminology and Systematicsmentioning

confidence: 63%

“…Remains of glyptodonts are very common in the fossiliferous sites of the Brazilian Intertropical Region (BIR), where they are represented mostly by osteoderms. This is arguably a result of the osteoderms' high preservation potential due to the great number that can be produced from a single individual (Gaudin & Wible, 2006;Pereira et al, 2014). Among the glyptodont genera most common in the BIR are Panochthus sp.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to being a traditional source of macroscopic characters for specific differentiation, isolated osteoderms and carapace fragments have recently been used as sources for mitochondrial DNA for use in molecular phylogenetic analyses (e.g. Delsuc et al, 2016), for histological characters useful in systematics, and also to infer ontogenetic and functional aspects of the animal (Hill, 2006;Wolf et al, 2012;Pereira et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Histological variation in osteoderms Panochthus sp. and Glyptotherium sp.(Xenarthra: Mammalia) from the Brazilian intertropical region

Araújo¹,

Porpino²

2018

Rev. bras. paleontol.

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-Glyptodonts are one of the most peculiar mammal groups that inhabited South America during the Pleistocene. Among the main characteristics of the group is the presence of a carapace composed of hundreds of osteoderms, which take on variable forms and external ornamentation. The fossiliferous sites of the Brazilian Intertropical Region (RIB) are rich in glyptodont fossils, of which the osteoderms are the most registered elements, possibly due to their high potential for preservation. Recently, the analysis of histological characteristics has proven useful in the differentiation of genera and species. However, the samples used are still limited and do not consider possible differences among different regions of the carapace. In this work, we evaluate possible histological variations among the osteoderms of Glyptotherium sp. and Panochthus sp. from different regions of the carapace and, based on a larger number of specimens, discuss their implications for the systematics of these genera. We found differences among osteoderms from distinct regions of the carapace for both analysed genera. Within the morphological variation described for the osteoderms of Glyptotherium sp., it is observed that they have more characteristics in common with the species Glyptotherium floridanum than with Glyptodon reticulatus, thus reinforcing that the Glyptodontinae findings in the BIR belong to the genus Glyptotherium sp. The osteoderms of Panochthus share a central region with common characters regardless of the position they occupy in the carapace; the main histological differences among them reside in the layers of compact bone, which show differences even in osteoderms of the same region. Caution is required when the presence of Neuryurus in the RIB deposits based on osteoderms is proposed, as morphological and histological characteristics of some representative of this genus overlap with some altered osteoderms (likely pathological) of the Panochthus sp. studied here.

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Section: Discussionsupporting

confidence: 77%