Imaging of the normal facial nerve

Vignaud, J; Sarrazin, Julien; Soulié, D; Pharaboz, C; Meriot, P.

doi:10.1007/978-3-7091-6829-5_3

Cited by 1 publication

(6 citation statements)

References 6 publications

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“…In addition, Adams-Tresman described both species as having teeth that are slender with sharply pointed crowns and enamel that is sculptured into a series of very fine longitudinal ridges. The similarity in tooth morphology was also highlight by Vignaud (1997) who grouped both species into the same morphotype (Type A1).…”

Section: Group Pairmentioning

confidence: 78%

“…4) to the exclusion of Steneosaurus brevior is supported by anatomical details of the teeth. As well as having a very similar skull geometry (Text-figs 2, 4), Vignaud (1997) recognized a similar tooth structure (Type B1) in S. heberti and Steneosaurus meretrix. The teeth are more pointed relative to those of Machimosaurus, but have a similar arrangement of longitudinal canals.…”

Section: Teleosaurid Morphospacementioning

confidence: 89%

“…In fact, Hua et al (1993Hua et al ( , 1994 found that the dental and anatomical differences between S. obtusidens and M. hugii can be interpreted in terms of ontogenetic variation and, therefore, proposed the synonymy of the two species. The tooth form in Steneosaurus hulkei could not be confirmed based on its fragmentary nature, but Vignaud (1997) noted similarities to both S. obtusidens and S. durobrivensis.…”

Section: Teleosaurid Morphospacementioning

confidence: 95%

“…Within this context, Adams-Tresman (1987b) highlighted a specimen (National Museum of Wales 1996 G12a) that appeared to show tooth crowns with an intermediate form between the two species. Hua et al (1993Hua et al ( , 1994 and Vignaud (1997) also recently acknowledged the similarity between the tooth morphology of S. obtusidens and Machimosaurus. In fact, Hua et al (1993Hua et al ( , 1994 found that the dental and anatomical differences between S. obtusidens and M. hugii can be interpreted in terms of ontogenetic variation and, therefore, proposed the synonymy of the two species.…”

Section: Teleosaurid Morphospacementioning

confidence: 99%

“…The cluster of specimens composing the species Machimosaurus hugii in this study ) is also supported by anatomical details of the teeth. The genus Machimosaurus is defined by the presence of blunt, conical teeth with a series of longitudinal canals (Krebs 1967;Vignaud 1997). Andrews (1913) diagnosed Steneosaurus obtusidens and Steneosaurus durobrivensis mainly on the form of their teeth, which he stated were blunt and rounded at the tips in S. obtusidens and more pointed in S. durobrivensis.…”

Section: Teleosaurid Morphospacementioning

confidence: 99%

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Morphospace occupation in thalattosuchian crocodylomorphs: skull shape variation, species delineation and temporal patterns

2009

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Skull shape variation in thalattosuchians is examined using geometric morphometric techniques in order to delineate species, especially with respect to the classification of Callovian species, and to explore patterns of disparity during their evolutionary history. The pattern of morphological diversity in thalattosuchian skulls was found to be very similar to modern crocodilians: the main sources of variation are the length and the width of the snout, but these broad changes are correlated with size of supratemporal fenestra and frontal bone, length of the nasal bone, size of the orbit and premaxilla and position of the narial opening. Patterns of shape variation, in combination with discrete-state morphology and stratigraphic and geographic range data were used to distinguish nine species of teleosaurid and 14 species of metriorhynchid, with the four currently recognized Callovian species being split into eight. Metriorhynchids were found to be more disparate from the average shape of morphospace than teleosaurids. However, short-snouted metriorhynchids and long-snouted teleosaurids showed the greatest amount of disparity with respect to snout morphotypes, indicating that each group tended to explore opposite areas of morphospace. Phylogeny was found to have a moderate influence on the pattern of morphospace occupation in metriorhynchids, but little effect in teleosaurids suggesting that other factors or constraints control the pattern of skull shape variation in thalattosuchians. A comparison of thalattosuchians with dyrosaur ⁄ pholidosaurids shows that thalattosuchians have a unique skull morphology, implying that there are multiple ways to construct a 'long snout'. Moreover, the skull geometry of the problematic species Pelagosaurus typus was found to converge on the teleosaurid area of morphospace. Finally, the temporal distribution of thalattosuchian species and morphotypes demonstrate a clear and highly correlated relationship with sea level curves and mass extinction events through the Jurassic and the Early Cretaceous.

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Section: Group Pairmentioning

confidence: 78%

Section: Teleosaurid Morphospacementioning

confidence: 89%

Section: Teleosaurid Morphospacementioning

confidence: 95%

Section: Teleosaurid Morphospacementioning

confidence: 99%

Section: Teleosaurid Morphospacementioning

confidence: 99%

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