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91 results for “Lepidosauria”
Fig. 32 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 32. Selected transverse HRXCT slices through the skull and right mandible of Gobiderma pulchrum (IGM 3/55) in the orbital region. A. Section 252 illustrates the anterolateral, postmaxillary part of the maxilla, among other structures. B. Section 318 through skull illustrates various palatal and mandibular contacts. Note the expansive dorsolaterally open adductor fossa, the complex pterygoid-ectopterygoid contact, and the large patches of pterygoid teeth.
Fig. 16 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 16. Selected transverse HRXCT slice through the snout of Gobiderma pulchrum (IGM 3/55; transverse slice 205) just anterior to the level of the anterior margin of the orbit. Note the maxillopalatine contact, the paired frontals, and the posterodorsally expansive lacrimal foramen.
Fig. 21 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 21. Selected transverse HRXCT slices through the skull and mandible of Gobiderma pulchrum (IGM 3/55). Note the presence of and development of the subolfactory processes of the frontal (cc, cristae crania, of some authors; see text).
Fig. 24 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 24. Right jugal of IGM 3/905 in medial view. Note the posteroventral process and the articular facets for the maxilla and ectopterygoid, among other anatomy.
Fig. 23 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 23. Gobiderma pulcrhum (IGM 3/905), posterior view of facial part of the skull illustrating the orbitonasal fenestra and lacrimal foramina, among other morphological characteristics.
Fig. 31 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 31. Transverse HRXCT slice through the skull of Gobiderma pulchrum (IGM 3/55) illustrating the pterygoids and the left epipterygoid contact.
Fig. 20 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 20. Selected transverse HRXCT slices through the facial portion of the skull in Gobiderma pulchrum (IGM 3/55). A. Slice 217 is at the level of the anterior margin of the orbit. B. Slice 229 is posterior to that point, but in the anterior one-third of the orbit.
Fig. 36 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 36. The braincases of selected monstersaurs. A. Reconstructed braincase of Gobiderma pulchrum in left lateral view primarily based on ZPAL MgR III/64, ZPAL MgR III/65, IGM 3/905, and IGM 3/55. B. Braincase of IGM 3/905 in left lateral view. C. Reconstruction of the braincase of Estesia mongoliensis in left lateral view (modified after Norell et al., 1992, and Norell and Gao, 1997). D. Braincase of Heloderma horridum in left lateral view (based on comparisons among AMNH R 64128, Boulenger, 1891, the Deep Scaly Project, 2007, and Evans, 2008). Note that reconstructed areas are represented by semiopaque shadows.
Fig. 29 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 29. Transverse HRXCT slice through the skull of Gobiderma pulchrum (IGM 3/55) posterior to the orbit, at the level of the anterior part of the braincase, just posterior to the basipterygoid processes, illustrating the contact of the prootic and parietal.
Fig. 28 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 28. Selected transverse HRXCT slices through the skull of Gobiderma pulchrum (IGM 3/55) at the level of the anterior part of the cranial portion. Sections A. near the base of the basipterygoid processes; B. just posterior to the dorsum sella; C. at the level of the posterior opening of the Vidian canal.
Fig. 35 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 35. Braincase and right suspensorium of Gobiderma pulchrum (IGM 3/905) in A. ventral and B. posterior view. Note that anterior is toward the top in A.
Fig. 27 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 27. Transverse HRXCT slice through the skull and mandible of Gobiderma pulchrum (IGM 3/55) at the anterior part of the cranial portion of the skull. Note the ventral jaw adductor shelf on the parietal, the descending processes of the parietal, and the crista alaris of the proötic.
Phalangeal Formula of Lepidosauria
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Fig. 50 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 50. Incomplete left manus of Gobiderma pulchrum (IGM 3/905) in dorsal view.
Fig. 47 in Osteology Of Gobiderma Pulchrum (Monstersauria, Lepidosauria, Reptilia)
Fig. 47. Pelvic girdle and associated structures in Gobiderma pulchrum (IGM 3/905).
Anguimorpha as a model group for studying the comparative heart morphology among Lepidosauria: Evolutionary window on the ventricular septation
<p>The group Anguimorpha represents one of the most unified squamate clades in terms of body plan, ecomorphology, ecophysiology and evolution. On the other hand, the anguimorphs vary between different habitats and ecological niches. Therefore, we focused on the group Anguimorpha to test a possible correlation between heart morphology and ecological niche with respect to phylogenetic position in Squamata with <em>Sphenodon</em>, <em>Salvator</em>, and <em>Pogona</em> as the outgroups. The chosen lepidosaurian species were investigated by microCT. Generally, all lepidosaurs had two well-developed atria with complete interatrial septum and one ventricle divided by ventricular septa to three different areas. The ventricles of all lepidosaurians had a compact layer and abundant trabeculae. The compact layer and trabeculae were developed in accordance with the particular ecological niche of the species; the trabeculae in nocturnal animals with low metabolism, such as <em>Sphenodon, Heloderma</em> or <em>Lanthanotus</em>, were more massive. On the other hand, athletic animals, such as varanids or <em>Salvator</em>, had ventricle compartmentalization divided by three incomplete septa. A difference between varanids and <em>Salvator</em> was found in compact layer thickness: thicker in monitor lizards and possibly linked to their mammalian-like high blood pressure, and the level of ventricular septation. In summary: heart morphology varied among clades in connection with the ecological niche of particular species and it reflects the phylogenetic position in the model clade Anguimorpha. In the absence of fossil evidence, this is the closest approach to understanding heart evolution and septation in clades with different cardiac compartmentalization levels. </p>
Data from: A new sphenodontian (Diapsida: Lepidosauria) from the Upper Triassic of Germany and its implications for the mode of sphenodontian evolution
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Anguimorpha as a model group for studying the comparative heart morphology among Lepidosauria: Evolutionary window on the ventricular septation
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Data from: Taxonomic reassessment of Clevosaurus latidens Fraser, 1993 (Lepidosauria, Rhynchocephalia) and rhynchocephalian phylogeny based on parsimony and Bayesian inference
The Late Triassic rhynchocephalian Clevosaurus latidens Fraser, 1993 is known from the fissure deposits of Cromhall Quarry, England. Many studies have questioned its referral to the genus Clevosaurus and some phylogenetic analyses suggest a close relationship with herbivorous rhynchocephalians. We reexamine the type specimens and referred material of C. latidens to elucidate its taxonomic identity. Additionally, we provide new phylogenetic analyses of the Rhynchocephalia using both parsimony and Bayesian approaches. Our taxonomic review and both phylogenetic analyses reveal that C. latidens is not referable to Clevosaurus, but represents a new genus. We reassess C. latidens and provide an amended diagnosis for the new genus Fraserosphenodon gen. nov. Both parsimony and Bayesian analyses recover similar topologies and we propose formal names for two higher clades within Rhynchocephalia: Eusphenodontia and Neosphenodontia.
Figure 13 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones
Figure 13. Photographs of Clevosaurus hudsoni specimen NHMUK PV R36832. A, partial left lateral view of the skull, showing the position of sclerotic ossicles in the orbital area. B, enlarged view of preserved sclerotic ossicles.
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International Brain Laboratory public data
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OpenNeuro
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