The ethmoidal region of Dibamus taylori (Squamata: Dibamidae), with a phylogenetic hypothesis on dibamid relationships within Squamata

Hallermann, Jakob

doi:10.1111/j.1096-3642.1998.tb02157.x

Cited by 59 publications

(74 citation statements)

References 32 publications

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“…Subsequent analyses either supported this (e.g. Hallerman, 1998) or suggested alternatives, namely Scincomorpha+Gekkota (e.g. Presch, 1988;Reynoso & Callison, 2000) or Anguimorpha+Gekko-ta (e.g.…”

Section: (C) Iguaniamentioning

confidence: 91%

At the feet of the dinosaurs: the early history and radiation of lizards

2003

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Lizards, snakes and amphisbaenians together constitute the Squamata, the largest and most diverse group of living reptiles. Despite their current success, the early squamate fossil record is extremely patchy. The last major survey of squamate palaeontology and evolution was published 20 years ago. Since then, there have been major changes in systematic theory and methodology, as well as a steady trickle of new fossil finds. This review examines our current understanding of the first 150 million years of squamate evolution in the light of the new data and changing ideas. Contrary to previous reports, no squamate fossils are currently documented before the Jurassic. Nonetheless, indirect evidence predicts that squamates had evolved by at least the middle Triassic, and had diversified into existing major lineages before the end of this period. There is thus a major gap in the squamate record at a time when key morphological features were evolving. With the exception of fragmentary remains from Africa and India, Jurassic squamates are known only from localities in northern continents (Laurasia). The situation improves in the Early Cretaceous, but the southern (Gondwanan) record remains extremely poor. This constrains palaeobiogeographic discussion and makes it difficult to predict centres of origin for major squamate clades on the basis of fossil evidence alone. Preliminary mapping of morphological characters onto a consensus tree demonstrates stages in the sequence of acquisition for some characters of the skull and postcranial skeleton, but many crucial stages--most notably those relating to the acquisition of squamate skull kinesis--remain unclear.

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Section: (C) Iguaniamentioning

confidence: 91%

At the feet of the dinosaurs: the early history and radiation of lizards

2003

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“…Except for the nasal capsule (Hallermann, 1998), the otico-occipital region is arguably the most complex structure in the squamate skull. Some introductory remarks are therefore appropriate in order to place this study in its proper context.…”

mentioning

confidence: 99%

The development of the skull in Acrochordus granulatus (Schneider) (Reptilia: Serpentes), with special consideration of the otico‐occipital complex

Rieppel

Zaher

2001

Journal of Morphology

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The skull of Acrochordus has been characterized by the absence of a crista circumfenestralis (a synapomorphy shared by all snakes), and by the absence of a recessus scalae tympani that in other squamates forms by subdivision of the embryonic metotic fissure. These traits have variably been identified as either plesiomorphic or paedomorphic. The study of the development of the osteocranium in a series of cleared and stained embryos of Acrochordus shows a close correspondence to the development of the skull in other snakes. The exception is the formation of the postorbital from two ossification centers. The significance of this observation, which might suggest the embryonic fusion of a postfrontal with a postorbital, remains enigmatic, as it is based on one side only of the skull of a single specimen. By contrast, a rudimentary and modified crista circumfenestralis can be identified in the skull of Acrochordus. Furthermore, absence of a recessus scalae tympani is not due to an undivided fissura metotica, but results from the obliteration of the anterior part of the metotic fissure instead. With respect to this character, Acrochordus is neither plesiomorphic, nor paedomorphic, but autapomorphic. This interpretation of the skull of Acrochordus is compatible with the sister-group relationships this genus shares with colubroid snakes.

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“…Gekkota (Lee 1998;Evans & Barbadilo, 2008), Lacertidae (Schwenk, 1988;Wu, 1996), Scincidae (Conrad, 2008), Dibamidae (Greer, 1985b;Hallermann, 1998;Kearney, 2003;Rieppel & Zaher, 2000a;Lee, 2000;Gauthier et al, 2012) and snakes (Rage, 1982). However, recent studies based on molecular and morphological analyses (total evidence) suggest that Amphisbaenia are related to Lacertidae (Townsend et al, 2004;Vidal & Hedges, 2005;Vidal & Hedges, 2008;Wiens, 2010Wiens, , 2012Müller et al, 2011;Streicher & Wiens, 2017).…”

Section: Ano Ps Bila Bia Latu S Am Ph Isb Ae Na Rid Ley I Am Ph Isb Amentioning

confidence: 99%

Phylogeny and evolution of head shape in the Amphisbaenia (Reptilia: Squamata)

Mendes¹

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The ethmoidal region of Dibamus taylori (Squamata: Dibamidae), with a phylogenetic hypothesis on dibamid relationships within Squamata

Cited by 59 publications

References 32 publications

At the feet of the dinosaurs: the early history and radiation of lizards

At the feet of the dinosaurs: the early history and radiation of lizards

The development of the skull in Acrochordus granulatus (Schneider) (Reptilia: Serpentes), with special consideration of the otico‐occipital complex

Phylogeny and evolution of head shape in the Amphisbaenia (Reptilia: Squamata)

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