The braincases of two glyptosaurines (anguidae, Squamata) and anguid phylogeny

Conrad, Jack L.; Norell, Mark A.

doi:10.1206/586.1

Cited by 452 publications

(29 citation statements)

References 31 publications

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“…Since their discovery, the Glyptosaurinae have always been included in the Anguidae (Conrad and Norell, 2008), although Hill (2005) proposed to consider them as the sister group of a clade including Scincoidea (Scincidae, Cordylidae, Gerrhosauridae) and Anguidae.…”

Section: Methodsmentioning

confidence: 99%

The histological structure of glyptosaurine osteoderms (Squamata: Anguidae), and the problem of osteoderm development in squamates

Buffrénil

Sire

Rage

2010

Journal of Morphology

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Glyptosaurinae, a fossil clade of anguid lizards, possess robust osteoderms, with granular ornamentation. In this study, the structural and histological features of these osteoderms were described in order to reconstruct their developmental pattern and further document the degree of homology that could exist between vertebrate integumentary skeletons. Glyptosaurine osteoderms have a diploe architecture and display an unusually complex structure that includes four tissue types: a core of woven-fibered bone intensely remodeled; a peripheral formation of the same tissue containing dense bundles of long Sharpey fibers; a thick basal layer of lamellar bone; and a superficial layer of a non-osseous material that belongs to the category of hypermineralized tissues such as ganoine, or enameloid and enamel tissues. The growth pattern of glyptosaurine osteoderms involved appositional processes due to osteoblast activity. In early growth stages, osseous metaplasia might have also been involved, but this possibility is not substantiated by histological observations. The superficial layer of the osteoderms must have resulted from epidermal contribution, a conclusion that would support previous hypotheses on the role of epidermal-dermal interactions in the formation of squamate osteoderms.

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Section: Methodsmentioning

confidence: 99%

The histological structure of glyptosaurine osteoderms (Squamata: Anguidae), and the problem of osteoderm development in squamates

Buffrénil

Sire

Rage

2010

Journal of Morphology

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“…The fenestra ovalis is relatively small, a feature often seen in relatively large anguimorphs like Gobiderma pulchrum, Heloderma, Helodermoides tuberculatus (see Conrad and Norell, 2008: fig. 5), and the larger species of Varanus (e.g., Varanus komodoensis and Varanus exanthematicus).…”

Section: Systematicsmentioning

confidence: 99%

Osteology of Gobiderma pulchrum (Monstersauria, Lepidosauria, Reptilia)

Conrad

Rieppel

Gauthier

et al. 2011

Bulletin of the American Museum of Natural History

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“…A plate-like clinoid processes (clp, Fig. 8C); these two canals are unusually close to each other when compared with other squamates, such as Sphaeroactylus roosevelti and the gliptosaurine Helodermoides tuberculatus (Conrad and Norell 2008). 8) of the parabasisphenoid overlays most of the basipterygoid process (except the articulation facets) and between these two structures is formed an enclosure for the course of lateral head vein (hvc, Fig.…”

Section: Neurocraniummentioning

confidence: 92%

“…8B,C) which are separated by a thin lamina from the wider anterior opening for the vidian canal (avc, Fig. 8C); these two canals are unusually close to each other when compared with other squamates, such as Sphaeroactylus roosevelti and the gliptosaurine Helodermoides tuberculatus (Conrad and Norell 2008). A foramen for the abducens nerve (cranial nerve VI, Fig.…”

Section: Neurocraniummentioning

confidence: 99%

Anatomy of an enigma: an osteological investigation of the Namibian festive gecko (Narudasia festiva: Gekkonidae: Gekkota)

2011

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Daza, J.D., Aurich, J. and Bauer, A.M. 2012. Anatomy of an enigma: an osteological investigation of the Namibian festive gecko (Narudasia festiva: Gekkonidae: Gekkota). -Acta Zoologica (Stockholm) 93: 465-486.The monotypic genus Narudasia is a poorly studied Namibian endemic gekkonid lizard. It has been hypothesized to have close relationships with a diversity of other gekkotan genera, including representatives of three of the currently recognized families of geckos, but most such interpretations have been based solely on overall morphological similarity. X-ray CT scans, cleared-and-stained specimens and conventional radiographs were used to provide a detailed osteological description of N. festiva, with an emphasis on the cranium. Narudasia exhibits a number of features associated with miniaturization, including a relatively large neurocranium and a bulging occipital condyle. However, many skeletal features differ from other minaturized taxa but are shared with one or more larger-bodied gecko taxa. Narudasia shares a number of putatively derived features with at least some representatives of a large clade of Afro-Malagasy gekkonids, but at present neither molecular nor osteological data adequately resolve its relationships. It remains a phylogenetic enigma, but more extensive osteological taxon sampling across the Gekkota may ultimately reveal synapomorphies uniting Narudasia with particular Afro-Malagasy genera.

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The braincases of two glyptosaurines (anguidae, Squamata) and anguid phylogeny

Cited by 452 publications

References 31 publications

The histological structure of glyptosaurine osteoderms (Squamata: Anguidae), and the problem of osteoderm development in squamates

The histological structure of glyptosaurine osteoderms (Squamata: Anguidae), and the problem of osteoderm development in squamates

Osteology of Gobiderma pulchrum (Monstersauria, Lepidosauria, Reptilia)

Anatomy of an enigma: an osteological investigation of the Namibian festive gecko (Narudasia festiva: Gekkonidae: Gekkota)

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