Three new Jurassic euharamiyidan species reinforce early divergence of mammals

Bi, Shundong; Wang, Yuanqing; Guan, Jian; Sheng, Xia; Meng, Jin

doi:10.1038/nature13718

Cited by 115 publications

(143 citation statements)

References 38 publications

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“…18). As a result, most mandibular features of Haramiyavia were excluded from two recent phylogenetic estimates (18,23). We note that Averianov et al (17) and Bi and colleagues (18) did not examine these preserved features in the original fossil material of Haramiyavia before disregarding these features.…”

Section: Mandibular Featuresmentioning

confidence: 97%

“…Bi and colleagues (18) further argued that "Logically, a mandibular middle ear cannot be assumed in Haramiyavia" (supporting information p. 19 in ref. 18). As a result, most mandibular features of Haramiyavia were excluded from two recent phylogenetic estimates (18,23).…”

Section: Mandibular Featuresmentioning

confidence: 99%

“…1) were questioned by Averianov et al (17). Bi and colleagues (18) further argued that "Logically, a mandibular middle ear cannot be assumed in Haramiyavia" (supporting information p. 19 in ref. 18).…”

Section: Mandibular Featuresmentioning

confidence: 99%

“…Collectively haramiyids and eleutherodontids are referred to as "haramiyidans" (10, 14, 15, 18, 19). Recent discoveries of diverse eleutherodontids or eleutherodontid-related forms with skeletons from the Tiaojishan Formation (Middle to Late Jurassic) of China (18)(19)(20) have greatly augmented the fossil record of haramiyidans, ranking them among the most diverse mammaliaform clades of the Late Triassic and Jurassic.…”

mentioning

confidence: 99%

“…The conflicting placement of haramiyidans was attributable in part to the uncertainties in interpreting the isolated teeth of most Late Triassic haramiyids (21,22). More recent phylogenetic disagreements have resulted from different interpretations of mandibular characters in Haramiyavia (17)(18)(19)(20)(23)(24)(25), which has not been fully described ( figure 2 in ref. 1).…”

mentioning

confidence: 99%

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Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution

Luo

Gatesy

Jenkins

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

101

116

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As one of the earliest-known mammaliaforms, Haramiyavia clemmenseni from the Rhaetic (Late Triassic) of East Greenland has held an important place in understanding the timing of the earliest radiation of the group. Reanalysis of the type specimen using high-resolution computed tomography (CT) has revealed new details, such as the presence of the dentary condyle of the mammalian jaw hinge and the postdentary trough for mandibular attachment of the middle ear-a transitional condition of the predecessors to crown Mammalia. Our tests of competing phylogenetic hypotheses with these new data show that Late Triassic haramiyids are a separate clade from multituberculate mammals and are excluded from the Mammalia. Consequently, hypotheses of a Late Triassic diversification of the Mammalia that depend on multituberculate affinities of haramiyidans are rejected. Scanning electron microscopy study of tooth-wear facets and kinematic functional simulation of occlusion with virtual 3D models from CT scans confirm that Haramiyavia had a major orthal occlusion with the tallest lingual cusp of the lower molars occluding into the lingual embrasure of the upper molars, followed by a short palinal movement along the cusp rows alternating between upper and lower molars. This movement differs from the minimal orthal but extensive palinal occlusal movement of multituberculate mammals, which previously were regarded as relatives of haramiyidans. The disparity of tooth morphology and the diversity of dental functions of haramiyids and their contemporary mammaliaforms suggest that dietary diversification is a major factor in the earliest mammaliaform evolution.

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Section: Mandibular Featuresmentioning

confidence: 97%

Section: Mandibular Featuresmentioning

confidence: 99%

Section: Mandibular Featuresmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution

Luo

Gatesy

Jenkins

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

101

116

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High‐precision U‐Pb geochronology of the Jurassic Yanliao Biota from Jianchang (western Liaoning Province, China): Age constraints on the rise of feathered dinosaurs and eutherian mammals

Chu

Ramezani

et al. 2016

Geochem Geophys Geosyst

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The Yanliao Biota of northeastern China comprises the oldest feathered dinosaurs, transitional pterosaurs, as well as the earliest eutherian mammals, multituberculate mammals, and new euharamiyidan species that are key elements of the Mesozoic biotic record. Recent discovery of the Yanliao Biota in the Daxishan section near the town of Linglongta, Jianchang County in western Liaoning Province have greatly enhanced our knowledge of the transition from dinosaurs to birds, primitive to derived pterosaurs, and the early evolution of mammals. Nevertheless, fundamental questions regarding the correlation of fossilbearing strata, rates of dinosaur and mammalian evolution, and their relationship to environmental change in deep time remain unresolved due to the paucity of precise and accurate temporal constraints. These limitations underscore the importance of placing the rich fossil record of Jianchang within a high-resolution chronostratigraphic framework that has thus far been hampered by the relatively low precision of in situ radioisotopic dating techniques. Here we present high-precision U-Pb zircon geochronology by the chemical abrasion isotope dilution thermal ionization mass spectrometry (CA-ID-TIMS) from three interstratified ash beds previously dated by secondary-ion mass spectrometry (SIMS) technique. The results constrain the key fossil horizons of the Daxishan section to an interval spanning 160.89 to 160.25 Ma with 2r analytical uncertainties that range from 646 to 669 kyr. These data place the Yanliao Biota from Jianchang in the Oxfordian Stage of the Late Jurassic, and mark the Daxishan section as the site of Earth's oldest precisely dated feathered dinosaurs and eutherian mammals.

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Role of the tumor microenvironment in pancreatic cancer

Murakami

Hiroshima

Matsuyama

et al. 2019

Annals of Gastroent Surgery

129

100

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Pancreatic cancer remains a highly recalcitrant disease despite the development of systemic chemotherapies. New treatment options are thus urgently required. Dense stromal formation, so‐called “desmoplastic stroma,” plays controversial roles in terms of pancreatic cancer growth, invasion, and metastasis. Cells such as cancer‐associated fibroblasts, endothelial cells, and immune cells comprise the tumor microenvironment of pancreatic cancer. Pancreatic cancer is considered an immune‐quiescent disease, but activation of immunological response in pancreatic cancer may contribute to favorable outcomes. Herein, we review the role of the tumor microenvironment in pancreatic cancer, with a focus on immunological aspects.

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Three new Jurassic euharamiyidan species reinforce early divergence of mammals

Cited by 115 publications

References 38 publications

Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution

Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution

High‐precision U‐Pb geochronology of the Jurassic Yanliao Biota from Jianchang (western Liaoning Province, China): Age constraints on the rise of feathered dinosaurs and eutherian mammals

Role of the tumor microenvironment in pancreatic cancer

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