| Citation: |
Li-juan Xie, Jian Yi, Jian-ru Shi, Zhi-shuai Kang, Shi-chao Xu, Run-fu Wang, 2023. The morphology and histology of a juvenile Sinokannemeyeria from the Middle Triassic Ermaying Formation of Shanxi, North China, China Geology, 6, 685-694. doi: 10.31035/cg2023030
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The morphology and histology of a juvenile Sinokannemeyeria from the Middle Triassic Ermaying Formation of Shanxi, North China
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Abstract
Kannemeyeriiformes were dominated tetrapods in the Middle Triassic terrestrial faunae of China. Although abundant materials of Sinokannemeyeria have been collected, their postcranial morphology information is not well studied, especially the juveniles. This paper presents a description of an articulated Sinokannemeyeria skeleton from the Middle Triassic Ermaying Formation and reports the histological microstructure of its femur. This specimen represents a late-stage juvenile based on the histological information. For the first time, this specimen offers insights into the postcrania information of juvenile Sinokannemeyeria.
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Keywords:
- Tetrapods /
- Sinokannemeyeria /
- Histology /
- Bone microstructure /
- Middle Triassic /
- Geological survey engineering
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References
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Li-juan Xie, Jian Yi, Jian-ru Shi, Zhi-shuai Kang, Shi-chao Xu, Run-fu Wang, 2023. The morphology and histology of a juvenile Sinokannemeyeria from the Middle Triassic Ermaying Formation of Shanxi, North China, China Geology, 6, 685-694. doi: 10.31035/cg2023030
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Figure 1.
Photo of Nucun locality at Yushe County, Shanxi Province, China. All tetrapod fossils from this locality come from the bottom mudstones.
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Figure 2.
Field view of SXMG V 00089 fossil specimen collection, V 00089 prior to reinforcement and packaging，its surrounding rock is purplish red mudstone with high hardness and strength.
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Figure 3.
Locality information for SXMG V 00089 (YS-077). a–Location of Shanxi Province, China; b–location of the fossil site; c–stratigraphical column of the specimen-bearing horizon.
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Figure 4.
Photo of SXMG V 00089 displayed in the exhibition hall of SXMG. It is nearly 0.9 m×0.9 m square in size and is stored in a rectangular glass case of 1.3 m×1 m. The red line shows the position of the histology section across the left femur.
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Figure 5.
Partial skeletal structure of the SXMG V 00089 in dorsal view. a–Photograph and line drawing of the skull; b–photograph and line drawing of the right pelvic girdle and right hind limb.
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Figure 6.
Bone microstructure in juvenile SXMG V00089. a–c–The outer cortex under normal light; planepolarized light; orthogonal polarized light (scale=200 μm); d–f–the recrystallization of the endosteal cell under normal light; plane-polarized light; orthogonal polarized light (scale=50 μm); g–i–the secondary osteon in the inner cortex under normal light; plane-polarized light; orthogonal polarized light (scale=50 μm).
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Figure 7.
Schematic representation of the bone microstructure in the three ontogenetic stages of
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Figure 8.
Large stone statue and reconstruction drawing of Kannemeyeriid, as the macroscopic features of V 00089. a–Lateral view of the stone statue; b–anterior view of the stone statue; c–scientifical reconstruction drawing.