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7 results for “Nothosaurus”
Fig. 5 in A new species of the sauropsid reptile Nothosaurus from the Lower Muschelkalk of the western Germanic Basin, Winterswijk, The Netherlands
Fig. 5. Phylogenetic relationships of the genus Nothosaurus. The cladogram includes Nothosaurus winkelhorsti sp. nov. form the Lower Muschelkalk of Winterswijk. Note the basal position of the new species and its close relation to N. juvenilis from the Lower Hauptmuschelkalk (mo1).
Fig. 6 in A new species of the sauropsid reptile Nothosaurus from the Lower Muschelkalk of the western Germanic Basin, Winterswijk, The Netherlands
Fig. 6. Skull length plotted versus the ratio of the skull length and the maximal length of the upper temporal opening for NMNHL RGM 443825 and several species of Nothosaurus marchicus and N. winterswijkensis from the localities of Winterswijk and Rüdersdorf. Measurements of Winterswijk specimen were taken first hand in NME and NMNHL (Oosterink et al. 2003; Albers and Rieppel 2003), those of specimens from Rüdersdorf based on Schröder (1914).
Fig. 1 in A new species of the sauropsid reptile Nothosaurus from the Lower Muschelkalk of the western Germanic Basin, Winterswijk, The Netherlands
Fig. 1. Basal nothosaurid Nothosaurus winkelhorsti sp. nov., NMNHL RGM 443825 from the Lower Muschelkalk of Winterswijk, in left lateral view. A. Photograph. B. Explanatory drawing.
Fig. 3 in A new species of the sauropsid reptile Nothosaurus from the Lower Muschelkalk of the western Germanic Basin, Winterswijk, The Netherlands
Fig. 3. Basal nothosaurid Nothosaurus winkelhorsti sp. nov., NMNHL RGM 443825 from the Lower Muschelkalk of Winterswijk, in dorsal view. A. Photograph. B. Explanatory drawing.
Fig. 2 in A new species of the sauropsid reptile Nothosaurus from the Lower Muschelkalk of the western Germanic Basin, Winterswijk, The Netherlands
Fig. 2. Basal nothosaurid Nothosaurus winkelhorsti sp. nov., NMNHL RGM 443825 from the Lower Muschelkalk of Winterswijk, in right lateral view. A. Photograph. B. Explanatory drawing.
Data from: Life-history strategies indicate live-bearing in Nothosaurus (Sauropterygia)
In Sauropterygia, a diverse group of Mesozoic marine reptiles, fossil evidence of viviparity (live‐bearing) only exists for Pachypleurosauria and Plesiosauria, and was assumed to also be the case for nothosaurs. Previous studies have successfully applied an extant squamate model to sauropterygian life‐history traits. In extant squamates, oviparity and viviparity are associated with differences in life‐history trait combinations. We establish growth curves for Nothosaurus specimens based on their humeral histology. We then analyse life‐history traits derived from these curves and compare inferred traits to those of modern squamates and pachypleurosaurs to assess their reproduction mode. We show that birth to adult size ratios (i.e. birth size divided by the mother's size) provide good estimates of clutch sizes in extant squamates and in viviparous extinct marine reptiles, but these ratios cannot discriminate viviparous and oviparous squamates. Thus, large ratios do not indicate viviparity in fossil taxa to which the extant squamate model is applicable. Applying differences in birth size, age at maturation, and maximum longevity that are observed between extant viviparous and oviparous squamates to our Nothosaurus sample, we identified 7 out of 24 specimens as being potentially viviparous. Conversely, they suggested oviparity for many nothosaurs but also for many pachypleurosaur samples. Under the assumption that the entire clade Pachypleurosauria was viviparous, the majority of nothosaurs would also have been viviparous as they comprised trait combinations similar to those seen in pachypleurosaurs. Overall, this suggests that within nothosaurs and pachypleurosaurs both reproduction modes existed in different taxa.
Data from: Life-history strategies indicate live-bearing in Nothosaurus (Sauropterygia)
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