Journal ArticleDOI
The forebrain and midbrain of some squamates and their bearing on the origin of snakes
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Structural similarities between Anelytropsis, Dibamus, feyliniids and snakes show interdigitation of the periventricular gray zones of the optic tectum and enlargement of lamina 7 of the posterior colliculus, may suggest common ancestry between Dibia and snakes rather than parallelism.Abstract:
Anatomical analysis of the forebrain and midbrain of Anelytropsis, Dibamus and feyliniids reveals structural similarities with those of skinks and snakes. Skinks and feyliniids are probably derived from a common ancestral stock. This is suggested by mutual reduction of several telencephalic nuclei, by similar trends in the development of the dorsal thalamus, and by similarities in the lamination of their optic tecta. Anelytropsis, Dibamus, feyliniids and snakes show interdigitation of the periventricular gray zones of the optic tectum and enlargement of lamina 7 of the posterior colliculus. Of these three taxa, Dibamus is most similar to burrowing snakes and many of its brain characters are intermediate between skinks and burrowing snakes. These similarities may suggest common ancestry between Dibamus and snakes rather than parallelism.read more
Citations
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Journal ArticleDOI
The Vertebrate Eye and Its Adaptive Radiation.
TL;DR: The conductivity bridge derives its bridge source from a self-contained vacuum tube oscillator adjusted to approximately 1,000 cycles as mentioned in this paper, which operates directly from the A.C. power source.
Phylogenetic relationships within squamata
TL;DR: Camp, Charles Lewis ; Classification ; Congresses ; NH-Vertebrate Zoology ; Research Associate ; NMNH ; SDR
Journal ArticleDOI
Assembling the Squamate Tree of Life: Perspectives from the Phenotype and the Fossil Record
TL;DR: This study relied on traditionally prepared specimens as well as high-resolution computed tomography scans that afforded unprecendented access to the cranial anatomy of Squamata to provide an unparalleled sample of the phenotype enabling it to more fully explore the extreme incongruences between molecular and morphological topologies for the squamate tree of life.
Journal ArticleDOI
Phylogeny And Systematics Of Squamata (Reptilia) Based On Morphology
TL;DR: This study examines squamate relationships using 222 ingroup taxa scored for 363 morphological characters and confirms the monophyly of the clades Scleroglossa (extant squamates exclusive of Iguania), Gekkota, Scincomorpha, Lacertoidea,ScincoideA, Anguimorpha and Varanoidea.
References
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The Vertebrate Eye and Its Adaptive Radiation
TL;DR: The new Conductivity Bridge derives its bridge source.
Journal ArticleDOI
The Vertebrate Eye and Its Adaptive Radiation.
TL;DR: The conductivity bridge derives its bridge source from a self-contained vacuum tube oscillator adjusted to approximately 1,000 cycles as mentioned in this paper, which operates directly from the A.C. power source.
Journal ArticleDOI
Thalamotelencephalic projections in the turtle (Pseudemys scripta).
William C. Hall,Ford F. Ebner +1 more
TL;DR: Comparisons of the turtle's thalamotelencephalic projections with those present in two primitive mammalian species, the hedgehog and the opossum, provided a basis for identifying probable homologies in the forebrains of reptiles and mammals.
Journal ArticleDOI
The origin of snakes
A. D'a. Bellairs,Garth Underwood +1 more
TL;DR: The ancestors of snakes, irrespective of their habits, were closely related to the platynotid lizards, and the respective merits of these assumptions must mainly be assessed on evidence obtained from study of living forms.