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7 results for “Yanliao Biota”
Data from: The evolution of the modern avian digestive system – insights from paravian fossils from the Yanliao and Jehol biotas
The avian digestive system, like other aspects of avian biology, is highly modified relative to other reptiles. Together these modifications have imparted the great success of Neornithes, the most diverse clade of amniotes alive today. It is important to understand when and how aspects of the modern avian digestive system evolved among neornithine ancestors in order to elucidate the evolutionary success of this important clade and to understand the biology of stem birds and their closest dinosaurian relatives – Mesozoic Paraves. Although direct preservation of the soft tissue of the digestive system has not yet been reported, ingested remains and their anatomical location preserved in articulated fossils hint at the structure of the digestive system and its abilities. Almost all data concerning direct evidence of diet in Paraves comes from either the Upper Jurassic Yanliao Biota or the Lower Cretaceous Jehol Biota, both which are known from deposits in north-eastern China. Here, the sum of the data gleaned from the thousands of exceptionally well-preserved fossils of paravians is interpreted with regards to the structure and evolution of the highly modified avian digestive system and feeding apparatus. This information suggests intrinsic differences between closely related stem lineages implying strong homoplasy and that the modern digestive system is limited to the crownward lineage.
Fig. 4. 1–8 in New Spinicaudatan Species of Late Jurassic Linglongta Phase of Yanliao Biota from Western Liaoning, China
Fig. 4. 1–8. Linglongtaestheria daxishanensis gen. and sp. nov. 1, a right valve, NIGPCAS 163668 (L2–1) (light microscopy). 2, a broken right valve, NIGPCAS 163669 (L2–2) (light microscope). 3, displaced carapaces, NIGPCAS 163670 (L2–3) (light microscope). 4, small-sized polygonal reticulation on growth bands near the umbo of the specimen in figure 4.1 (SEM). 5, evenly distributed puncta on growth bands in the middle part of the carapace of the specimen in figure 4.1 (SEM). 6, two kinds of ornamentation pattern on growth bands in the postero-ventral part of the carapace of the specimen in figure 4.1, i.e., puncta in the upper and radial lirae with intercalated radially aligned puncta in the lower part of each growth band (SEM). 7, small-sized polygonal reticulation on growth bands in the antero-dorsal part of the carapace of the specimen in figure 4.3 (SEM). 8, two kinds of ornamentation pattern on growth bands in the ventral part of the carapace of the specimen in figure 4.3, i.e., puncta in the upper part and radial lirae with intercalated radially aligned puncta in the lower part of each growth band (SEM). Scale bars: (1–3) = 1 mm; (4) = 10 μm; (5) = 20 μm; (6–8) = 100 μm.
Fig. 3. 1–8 in New Spinicaudatan Species of Late Jurassic Linglongta Phase of Yanliao Biota from Western Liaoning, China
Fig. 3. 1–8. Linglongtaestheria daxishanensis gen. and sp. nov. 1, displaced carapaces, holotype, NIGPCAS 163667 (L1–1) (light microscopy). 2, small-sized polygonal reticulation on growth bands near the umbo (SEM). 3, evenly distributed small puncta on growth bands in the middle part of the carapace (SEM). 4, small-sized polygonal reticulation on growth bands in the antero-dorsal part of the carapace (SEM). 5,7, two kinds of ornamentation pattern on growth bands in the postero-ventral part of the carapace, i.e., punctate ornamentation in the upper, radial lirae with two rows of intercalated radially aligned puncta in the lower part of each growth band (SEM). 6, small-sized, polygonal reticulation transitions to radial lirae with intercalated radially aligned puncta on growth bands in the antero-dorsal part of the carapace (SEM). 8, two kinds of ornamentation pattern on single growth bands in the antero-ventral part of the carapace, i.e., puncta in the upper, punctate small-sized reticulation in the lower part of each growth band (SEM). Scale bars: (1) = 1 mm; (2, 5) = 20 μm; (4) = 50 μm; (3, 6–8) = 100 μm.
Fig. 2 in New Spinicaudatan Species of Late Jurassic Linglongta Phase of Yanliao Biota from Western Liaoning, China
Fig. 2. Stratigraphic column of the Tiaojishan Formation exposed near Daxishan village, Linglongta, Jianchang County, showing the fossil clam shrimp sampling horizons (after Duan et al. 2009).
Fig. 1 in New Spinicaudatan Species of Late Jurassic Linglongta Phase of Yanliao Biota from Western Liaoning, China
Fig. 1. Sampling locality at Daxishan village, Linglongta, Jianchang County, western Liaoning Province, China.
Data from: The evolution of the modern avian digestive system – insights from paravian fossils from the Yanliao and Jehol biotas
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Data from: Tooth microwear and occlusal modes of euharamiyidans from the Jurassic Yanliao Biota reveal mosaic tooth evolution in Mesozoic allotherian mammals
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