Paleontological Research最新文献_第8页

A Second Specimen of the Crossognathiform Fish Apsopelix miyazakii from the Cretaceous Yezo Group of Mikasa Area, Central Hokkaido, Japan 日本北海道中部Mikasa地区白垩纪Yezo群中交叉颌目鱼Apsopelix miyazakii第二只标本

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-04-01 DOI: 10.2517/pr200024

Shinya Miyata, Y. Yabumoto, Yasuhisa Nakajima, Yasuhiro Ito, Takenori Sasaki

引用次数: 0

New Taxonomic Features of Fossil Clam Shrimp Aquilonoglypta (Spinicaudata) and its Implication for Origin of Triglyptids 蛤虾化石Aquilonoglypta (Spinicaudata)的新分类特征及其对三脂类起源的启示

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR200028

Gang Li

{"title":"New Taxonomic Features of Fossil Clam Shrimp Aquilonoglypta (Spinicaudata) and its Implication for Origin of Triglyptids","authors":"Gang Li","doi":"10.2517/PR200028","DOIUrl":"https://doi.org/10.2517/PR200028","url":null,"abstract":"Abstract. The Triassic clam shrimp genus Aquilonoglypta Novojilov, 1958 was first erected based on a specimen collected from the Lower Triassic along the Laptev Sea coast of Russia. Its original diagnostic ornament was described as fish scale pits. Then, the genus was recovered in the Lower and Middle Triassic in the Ordos Basin in northwestern China. Because the Chinese specimens have punctate ornamentation, they were interpreted as the ancestor of the Jurassic triglyptids. In this study the diagnosis of Aquilonoglypta is revised following a re-examination of the Russian type specimens under a scanning electron microscope (SEM). In Aquilonoglypta growth bands near the umbo are ornamented with polygonal fine reticulation, which transitions to puncta on growth bands in the middle part of the carapace. The ornamentation on growth bands in the ventral part of the carapace clearly shows the transition from the puncta to a size-increasing fine reticulation pattern. This research result shows that Aquilonoglypta could not be the close link with triglyptids because of lacking of the fine reticulation on growth bands in the dorsal part of the carapace in the latter. On the contrary Triglypta Wang, 1984 could be more closely related to Punctatestheria Zhang et al., 2017.","PeriodicalId":54645,"journal":{"name":"Paleontological Research","volume":"26 1","pages":"8 - 17"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45643417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

An Avian Sternum (Aves: Procellariidae) from the Pleistocene Ichijiku Formation in Chiba, Japan 日本千叶更新世一宿组鸟类胸骨(鸟类:原鸟科)

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR200007

Keiichi Aotsuka, S. Isaji, H. Endo

引用次数: 0

A New Species of Ophiura (Echinodermata, Ophiuroidea) from Miocene Deep-Sea Deposits in the Pohang Basin, Korea 韩国浦项盆地中新世深海蛇属一新种(棘皮目，蛇总科)

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR200002

Y. Ishida, B. Thuy, G. Nam, A. Martynov, T. Fujita, J. Kim

引用次数: 3

Allometry between Suture Line Length and Phragmocone Volume in Some Cretaceous Ammonoids 白垩纪某些亚氨体缝合线长度与膈腔容积的异速测量

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR200031

Haruna Furui, T. Ubukata

{"title":"Allometry between Suture Line Length and Phragmocone Volume in Some Cretaceous Ammonoids","authors":"Haruna Furui, T. Ubukata","doi":"10.2517/PR200031","DOIUrl":"https://doi.org/10.2517/PR200031","url":null,"abstract":"Abstract. The allometric relationship between suture line length and phragmocone volume was examined in 28 specimens belonging to six ammonoid species recovered from the Upper Cretaceous Yezo Group of Hokkaido, Japan. The suture perimeter was calculated by summing the distances between digitized points along the suture line in a photograph. The phragmocone volume was calculated using a modified Raup's model. The relationship between suture perimeter and phragmocone volume in each species was expressed as an allometric equation on a logarithmic scale. The exponent of ontogenetic allometry estimated for each species ranged from 0.462 to 0.626. The exponents estimated were much greater than the exponent in the case of isometry (0.333) and the value previously obtained through interspecific comparison. Calculation using a theoretical morphologic model indicates that allometric exponents for the suture perimeter of approximately 0.5 reflect positive allometry of the septal surface area with respect to body size. The present results suggest that strong positive allometry of the suture perimeter leads to a considerable positive allometry of the septal surface area resulting in satisfying Kleiber's scaling law, although its functional significance remains unclear.","PeriodicalId":54645,"journal":{"name":"Paleontological Research","volume":"26 1","pages":"55 - 73"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47025207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Physeteroid from the Lower Miocene of Japan 日本中新世下的一种新类藻

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR200021

T. Kimura, Y. Hasegawa

引用次数: 0

Early Cretaceous Small-Sized Gastropods from the Shallow Marine Deposits of the Kimigahama Formation, Choshi Group, Japan 早白垩世日本朝石组木冈滨组浅海沉积物中的小型腹足类

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR20009

S. Isaji, T. Haga, K. Kashiwagi

{"title":"Early Cretaceous Small-Sized Gastropods from the Shallow Marine Deposits of the Kimigahama Formation, Choshi Group, Japan","authors":"S. Isaji, T. Haga, K. Kashiwagi","doi":"10.2517/PR20009","DOIUrl":"https://doi.org/10.2517/PR20009","url":null,"abstract":"Abstract. Twelve species of small gastropods are extracted using the sodium tetraphenylborate method from the strongly lithified shallow marine deposits of the Barremian (Lower Cretaceous) Kimigahama Formation of the Choshi Group, central Japan. They belong to the following families and subfamilies; Eudaroniidae, Pseudomelaniidae, Ampezzopleurinae, Metacerithiidae, Procerithiidae, Nystiellidae, Metaxiinae, Stuoraxidae and Ebalinae, including six new species and one new genus. Pseudomelania yamadai sp. nov., Ampezzopleura barremica sp. nov., Choshipleura striata gen. et sp. nov., Metacerithium boshuae sp. nov., Antiphora aurora sp. nov. and Stuoraxis kasei sp. nov. are described as new species. Pseudomelania yamadai, Metacerithium boshuae and Cirsocerithium subspinosum are closely related to or identical with the species from the Lower Cretaceous in western Europe. Ampezzopleura barremica and Choshipleura striata are the first Cretaceous records of the subfamily Ampezzopleurinae that has hitherto been limited to the Triassic deposits. Antiphora aurora is the first record of the family Triphoridae from Mesozoic deposits, suggesting that the sinistral triphorids originated from the dextral ancestor. Stuoraxis kasei is the youngest occurrence of the heterostrophan family Stuoraxidae that has hitherto been reported from the Permian to Middle Jurassic deposits. The sodium tetraphenylborate method for finding the small molluscs from the strongly lithified deposits is an effective tool with which to reveal the true diversity of the fossil molluscan fauna.","PeriodicalId":54645,"journal":{"name":"Paleontological Research","volume":"26 1","pages":"31 - 54"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49454468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Notes on Bibliography for Paleontological Publications 古生物学出版物参考书目注释

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/2022PR001

Martin J. Janal

引用次数: 0

On the Presence and Shape of Anterolateral Scars in the Ontogenetic Series of Femora for Two Early Sauropodomorph Dinosaurs from the Upper Triassic of Brazil 巴西上三叠世两种早期蜥脚形目恐龙股骨成体序列中前外侧瘢痕的存在和形状

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2022-01-01 DOI: 10.2517/PR200001

R. Müller

{"title":"On the Presence and Shape of Anterolateral Scars in the Ontogenetic Series of Femora for Two Early Sauropodomorph Dinosaurs from the Upper Triassic of Brazil","authors":"R. Müller","doi":"10.2517/PR200001","DOIUrl":"https://doi.org/10.2517/PR200001","url":null,"abstract":"Abstract. The anterolateral scar is a raised and generally rounded ossification on the anterolateral face of the femoral head of certain archosaurs, located anterior to the ‘greater trochanter’ and posterior to the femoral head. The presence and shape of this structure in early dinosaurs is still poorly understood. In the present study, the shape and variation of the anterolateral scar is preserved in two early sauropodomorph dinosaurs Pampadromaeus barberenai and Buriolestes schultzi from the Upper Triassic of Brazil. These sauropodomorphs are particularly significant because of their phylogenetic position as basal members of the clade and because they were coeval with the oldest of dinosaurs. Upon analysis, the specimens revealed distinct surface morphologies related to the anterolateral scar throughout their femoral series. Small specimens (putative juvenile individuals) of each species lack any sign of an anterolateral scar. On the other hand, the structure is well-developed in larger specimens (putatively adult individuals). Thus, an absence/presence of the anterolateral scar on the femora of early dinosaurs is affected by ontogeny, as observed in silesaurids. The presence of the anterolateral scar seems more widely distributed in ornithodirans than previously thought. Further, the absence of a raised anterolateral scar in massopodan sauropodomorphs appears to be a neotenic trait, since putatively immature early sauropodomorph individuals share this absence, while full adults develop a remarkable scar.","PeriodicalId":54645,"journal":{"name":"Paleontological Research","volume":"26 1","pages":"1 - 7"},"PeriodicalIF":0.9,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43869069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Ecosystem Reconstruction during the Cambrian Explosion 寒武纪大爆发期间的生态系统重建

IF 0.9 4区地球科学

Paleontological Research Pub Date : 2021-10-01 DOI: 10.2517/2021PR003

Xingliang Zhang, Chao Chang, L. Cui, Yuheng Qiao

{"title":"Ecosystem Reconstruction during the Cambrian Explosion","authors":"Xingliang Zhang, Chao Chang, L. Cui, Yuheng Qiao","doi":"10.2517/2021PR003","DOIUrl":"https://doi.org/10.2517/2021PR003","url":null,"abstract":"Abstract. The Cambrian explosion ultimately resulted in the critical transition from microbially dominated ecosystems in the Precambrian to metazoan-dominated ecosystems in the Phanerozoic. However, the temporospatial pattern of ecosystems during the Cambrian explosion is poorly understood largely because our current knowledge is biased in metazoan evolution and redox conditions, and thus insufficient to reconstruct an ecosystem that is an integrative entirety of biotic and abiotic components. Therefore, we proposed a facies-dependent integrative approach as a working hypothesis toward a more comprehensive understanding of ecosystem evolution during the Cambrian explosion. The basis is to collect data from a rock unit with a consistent facies (or a biota) in five aspects: biodiversity, ecological network, climate, environmental trio (living, taphonomic and sedimentary conditions), and biogeochemical cycles. On the basis the temporospatial pattern can be built by tracking the spatial heterogeneity and tracing the temporal variability. Although the scenario is a general solution, not obligately applicable to the Cambrian explosion, and needs tremendous amount of work, it is a practical way, probably the only way, to understand such a global event with great complexity.","PeriodicalId":54645,"journal":{"name":"Paleontological Research","volume":"25 1","pages":"305 - 314"},"PeriodicalIF":0.9,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45225091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1