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7 results for “Lactodens”
Fig. 4 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig. 4. Upper molars of the trechnotherian mammal Lactodens sheni Han and Meng, 2016, from Aptian, Lower Cretaceous Jiufotang Formation, Caoyang City, Liaoning Province, China. A. Holotype (HG-M016) from Shangheshou area; right ultimate premolar and M1–M6 in buccal (A1) and occlusal (A2) views, showing the corresponding cusps on different teeth. B. ZGY0053 from Dapingfang; left upper molars (M1–M6) in occlusal (B1), buccal (B2), and lingual (B3) views. Image in B3 is horizontally flipped for convenience of comparison.
Fig. 5 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig. 5. Lower teeth of the trechnotherian mammal Lactodens sheni Han and Meng, 2016 (ZGY0053) from Aptian, Lower Cretaceous Jiufotang Formation of Dapingfang, Caoyang City, Liaoning Province, China), right c–m6 in lingual (A1) and occlusal (A2) views (with the dentary bone segmented away) and in posterobuccal view (A5), left p5–m6 in buccal (A3) and occlusal (A4) views. See also Figs. 3 and 7.
Fig. 3 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig. 3. CT-rendered lower jaws and dentitions of the trechnotherian mammal Lactodens sheni Han and Meng, 2016 (ZGY0053), from Aptian, Lower Cretaceous Jiufotang Formation of Dapingfang, Caoyang City, Liaoning Province, China. A1–A3, left upper and lower dentition and dentary in medial (only teeth), lateral, and occlusal views, respectively. A4–A6, right upper and lower dentition and dentary in lateral, medial, and occlusal views, respectively. Note: angular end is not the mandibular condyle (see Fig. 6); coronoid tubercle, mis-labelled as "cp" in Han and Meng (2016: fig. 10). Upper and lower teeth in A1, A2, A4, A5 are in the original position that were preserved. Arrows in A2, A4 point to mental foramina (note the difference between the two mandibles). Question mark in A5 points to a faint groove that is not the Meckelian groove (compared to that of Origolestes lii in Fig. 6B).
Fig. 1 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig. 1. New specimen of Lactodens sheni Han and Meng, 2016 (ZGY0053) from Aptian, Lower Cretaceous Jiufotang Formation of Dapingfang, Caoyang City, Liaoning Province, China. A. Partial skeleton in dorsal view that is preserved in the main slab. B. CT rendered partial skull; mostly ventral portion with teeth in dorsal (B1) and ventral (B2) views and mainly the skull roof in dorsal (B3) and ventral (B4) views.
Fig. 7 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig. 7. Comparison of molars between of Origolestes and Lactodens. A. Origolestes lii Mao, Hu, Li, Wang, Chase, Smith, and Meng, 2020 (IVPP V13604) from Lower Cretaceous Lujiatun beds of the Yixian Formation of the Lujiatun locality, Beipiao County, Liaoning Province, China; upper molars (M1–M2) in buccal (A1) and occlusal (A2) views; lower molars (m1–m3) in occlusal (A3) and lingual (A4) views (modified from Mao et al. 2020). B. Lactodens sheni Han and Meng, 2016 (ZGY0053) from Aptian, Lower Cretaceous Jiufotang Formation of Dapingfang, Caoyang City, Liaoning Province, China; upper molars (M1–M4) in buccal (B1) and occlusal (B2) views; lower molars (m1–m4) in occlusal (B3) and lingual (B4) views. Image in B1 has been vertically reversed for convenience of comparison. The lower teeth (m1–m4) in B3 and B4 were composite from better preserved left m2–m3 (reversed) and right dentitions (m1, m4). The angular lines indicate the symmetrical (O. lii) and asymmetrical (L. sheni) crown outline and the embrasure.
Fig 6 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig 6. Comparison of the mandibular morphologies of Origolestes and Lactodens. A. Lactodens sheni Han and Meng, 2016 (holotype, HG-M016) from Aptian, Lower Cretaceous Jiufotang Formation of Shangheshou area, Caoyang City, Liaoning Province, China; posterior portion of the right mandible in buccal (A1) and lingual (A2) views. B. Origolestes lii Mao, Hu, Li, Wang, Chase, Smith, and Meng, 2020 (IVPP V13604) from Lower Cretaceous Lujiatun beds of the Yixian Formation of the Lujiatun locality, Beipiao County, Liaoning Province, China; right mandible in buccal (B1) and lingual (B2) views. The mandible in B was slightly displaced at the crack (marked with the arrow) and has been digitally restored (see Mao et al. 2020).
Fig. 2 in New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Fig. 2. CT-images of the trechnotherian mammal Lactodens sheni Han and Meng, 2016, from Aprian, Lower Cretaceous Jiufotang Formation, Caoyang City, Liaoning Province, China. A. Holotype (HG-M016) from Shangheshou area; A1, virtual skull remains with the lingual side of the right mandible exposed (see Han and Meng 2016: fig. 1); A2, virtual skull remains with the lateral side of the right mandible exposed (this side of the skull is embeded in the matrix and not visible except for the part of cheek teeth that were needle-prepared from the back side of the slab (Han and Meng 2016: figs. 1, 5); A3, a CT-slice showing the contrast of bone and matrix and revealing the roots of some teeth. B. ZGY0053 from Dapingfang, a CT-section through the skull (showing the root conditions). Note there is no tooth germ under any cheek teeth in both specimens in A3 and B.
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