New Information on the Madagascan Middle Jurassic Sauropod Lapparentosaurus madagascariensis
Abstract
:1. Introduction
1.1. Historical Background of the Cetiosauridae Group
1.2. Geological Setting
2. Materials and Methods
3. Results
3.1. Anatomical Description
Characteristics of the Femur
- The great trochanter is considerably lower than the femoral head;
- No prominent bulge is present in the lateral surface on the proximal end (same as Cetiosaurus), different from femora of Titanosauriforms;
- Lesser trochanter is absent (Character coding: 197) [39];
- The 4th trochanter is supposed to be reduced to a low ridge possibly (character coding: 196) [39] located in the middle shaft but is expected to be straight (Character coding: 199) [39] and where the transverse diameter is subequal to 125%–150% anterioposterior diameter (character coding: 198) [39], which is also a missing part in Figure 3 (lies at the posteromedial margin of the shaft in Haplocanthosaurus and neosauropods).
3.2. The Neural Spine
3.3. The Vertebra
4. Discussions
4.1. Affinities with the Genus Cetiosaurus
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- Pyramid-shaped neural spines in posterior cervical and anterior dorsal vertebrae;
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- Loss of the spinodiapophysal lamina on dorsal vertebrae;
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- Anterior chevrons with anteroposteriorly compressed distal shaft;
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- Distal caudal centra have a tongue-like projection at the dorsal midline of their articular ends;
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- A distinct hollow on the lateral surface of the ilium at the base of the pubic process.
4.2. Family Affinities of the Madagascan Form
4.3. Reliability of the Taxonomic Affinities of the Madagascan Form
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Anatomical Element | Measurement | Short Detailed Description |
---|---|---|
Femur | Length: 710 mm from the tip of femoral head until the tip of the distal part of the femur | A short–sized femur but heavy and no 4th trochanter which is supposed to be located in the main area of the shaft (Missing part length roughly to be 210 mm) |
Neural spine | Length: 225 mm from the top of the neural spine until the border tip of the centrum. | A relatively flat neural spine in lateral view with different orientation of laminae |
Vertebra | Height: from the top of the centrum until the base of the centrum 170 mm | A low-heighted centrum which is supposed to belong a posterior dorsal. |
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Raveloson, M.L.T.; Clark, N.D.L.; Rasoamiaramana, A.H. New Information on the Madagascan Middle Jurassic Sauropod Lapparentosaurus madagascariensis. Geosciences 2019, 9, 498. https://doi.org/10.3390/geosciences9120498
Raveloson MLT, Clark NDL, Rasoamiaramana AH. New Information on the Madagascan Middle Jurassic Sauropod Lapparentosaurus madagascariensis. Geosciences. 2019; 9(12):498. https://doi.org/10.3390/geosciences9120498
Chicago/Turabian StyleRaveloson, Miky Lova Tantely, Neil D. L. Clark, and Armand H. Rasoamiaramana. 2019. "New Information on the Madagascan Middle Jurassic Sauropod Lapparentosaurus madagascariensis" Geosciences 9, no. 12: 498. https://doi.org/10.3390/geosciences9120498
APA StyleRaveloson, M. L. T., Clark, N. D. L., & Rasoamiaramana, A. H. (2019). New Information on the Madagascan Middle Jurassic Sauropod Lapparentosaurus madagascariensis. Geosciences, 9(12), 498. https://doi.org/10.3390/geosciences9120498