Journal of Paleontology最新文献_第4页

Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China 准噶尔西部晚泥盆世两种新寄生三叶虫的晶状体变异

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-29 DOI: 10.1017/jpa.2023.31

Ruiwen Zong

{"title":"Variation in eye lenses of two new Late Devonian phacopid trilobites from western Junggar, NW China","authors":"Ruiwen Zong","doi":"10.1017/jpa.2023.31","DOIUrl":"https://doi.org/10.1017/jpa.2023.31","url":null,"abstract":"\u0000 The suborder Phacopina, characterized by schizochroal eyes, is among the most common groups of trilobites in Devonian strata. The marine sediments of the Famennian in western Junggar, Xinjiang, contain abundant low-disparity phacopids, which have previously been designated to Omegops accipitrinus mobilis, Phacops circumspectans tuberculosus, and Omegops cornelius on the basis of small numbers of poorly preserved specimens. In this study, these phacopids were identified as two new species of Omegops, O. honggulelengensis n. sp. and O. xiangi n. sp., on the basis of nearly 200 well-preserved specimens. The intraspecific variations of eye lenses of these specimens were quantitatively analyzed. On the basis of differences in the total number, number of dorsoventral files, and arrangement of the eye lenses, the absence of lenses in the middle part of the visual surface, and asymmetry of the number and/or arrangement of lenses in the two eyes, it was concluded that the reasons for intraspecific variation in eye lenses of Late Devonian Omegops from western Junggar were different from previously described factors but were likely genetic or embryological malfunctions or abnormalities caused by pathological conditions. Diversity of lenses in the schizochroal eyes shows that the number and arrangement of eye lenses was not stable in Phacopina. Therefore, many specimens are needed for quantitative study to determine the true characteristics of the number or arrangement of eye lenses when these features are used in the systematic taxonomy of Phacopina.\u0000 UUID: http://zoobank.org/6bd14390-05fe-45ad-8eeb-3bf397a46a68","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48427339","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

Pleurocystites? scylla, a new species of pleurocystitid rhombiferan, and comments on early echinoderm teratologies 胸膜孢子虫？菱形胸膜囊虫属一新种“scylla”及其对棘皮动物早期畸形的评价

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.17

Aidan Sweeney, C. Sumrall

引用次数: 0

New specimens of Cyclocystoides scammaphoris (Echinodermata) from the Upper Ordovician rocks of the American midcontinent with implications for cyclocystoid functional morphology 美国中大陆上奥陶统岩石中棘皮动物纲环囊动物的新标本及其对环囊动物功能形态的意义

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.33

D. Kolata, Terry Frank, Asaf Kaplan, T. Guensburg

{"title":"New specimens of Cyclocystoides scammaphoris (Echinodermata) from the Upper Ordovician rocks of the American midcontinent with implications for cyclocystoid functional morphology","authors":"D. Kolata, Terry Frank, Asaf Kaplan, T. Guensburg","doi":"10.1017/jpa.2023.33","DOIUrl":"https://doi.org/10.1017/jpa.2023.33","url":null,"abstract":"Abstract. New specimens of Cyclocystoides scammaphoris Smith and Paul, 1982, are here reported from the Upper Ordovician Platteville Formation of northern Illinois, Plattin and Decorah groups of east-central Missouri, and Lebanon Limestone of central Tennessee. These fossils reveal skeletal details that provide insight into the anatomy of cyclocystoids. Of particular significance is a network of channels that likely originate near the center of the central disk and extend along the oral side of the radial plates, bifurcating distally two or three times before entering the radial facets on the proximal surface of each marginal ossicle. From here, the network enters a series of facet canals that extend upward through each marginal ossicle, exiting in a linear row of pores. The canals are very similar in size and distribution to the nerve canals in living echinoderms. The axes of the canals, which number up to 500 in some specimens, and those of the radial ducts project proximally away from the oral surface at an elevation angle of about 25°, apparently forming a network that could have converged within the upper part of the body cavity. This origin and function are made clear by the connection between the channel on each radial plate and the radial facet canal pores within each marginal ossicle.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"639 - 651"},"PeriodicalIF":1.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44859987","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

Shell and associated operculum in Teiichispira (Macluritidae: Gastropoda) from the Early/Middle Ordovician of the Argentine Precordillera 阿根廷Precordillera早/中奥陶世teiichipira (maclurtidae:腹足目)的壳和伴生盖

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.7

V. Bertero, Mariel Ferrari, Marcelo G. Carrera

{"title":"Shell and associated operculum in Teiichispira (Macluritidae: Gastropoda) from the Early/Middle Ordovician of the Argentine Precordillera","authors":"V. Bertero, Mariel Ferrari, Marcelo G. Carrera","doi":"10.1017/jpa.2023.7","DOIUrl":"https://doi.org/10.1017/jpa.2023.7","url":null,"abstract":"Abstract. Two species of Teiichispira Yochelson and Jones reported from the Early/Middle Ordovician marine deposits of the San Juan Formation in the Argentine Precordillera are described. The new species Teiichispira teresae n. sp. is a component of the Early/Middle Ordovician marine gastropod assemblage in the studied region; Teiichispira argentina (Kayser), previously known from the San Juan Formation, is described with a complete teleoconch and associated operculum. The opercula of both Teiichispira species are complete and preserved in life position associated with the shell of T. argentina. The unguiculate morphology of the operculum is here interpreted as a mechanism for increasing the shell weight and ensuring anchoring to the substrate in a more or less fixed mode of life for Teiichispira, and as protection. The new occurrence of Teiichispira provides new taxonomic data on early Paleozoic marine gastropods in Argentina and testifies to a wide paleobiogeographical distribution for the genus, restricted to tropical and subtropical regions during the Early/Middle Ordovician.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"549 - 557"},"PeriodicalIF":1.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46483275","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

The first documentation of an Ordovician eurypterid (Chelicerata) from China 中国首次记录到一种奥陶纪的灰蝶属（Chelicerata）

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.21

Hang-Qiang Wang, S. Braddy, J. Botting, Yuandong Zhang

引用次数: 1

New trilobite assemblage from the lower Cambrian (upper Stage 4) of the Lake Zone, western Mongolia 蒙古西部湖区下寒武纪（上4阶）新三叶虫组合

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.23

Z. Sun, Aihua Yang, Fangchen Zhao, A. Zhuravlev, Bing Pan, Chunlin Hu, Qian Feng, Xi Chen, Maoyan Zhu

引用次数: 1

Anatomy of the holotype of ‘Probelesodon’ kitchingi revisited, a chiniquodontid cynodont (Synapsida, Probainognathia) from the early Late Triassic of southern Brazil 来自巴西南部晚三叠世早期的一种chiniquodontid犬齿兽(Synapsida, Probainognathia)的“Probelesodon”kitingi的完整解剖

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.25

C. Hoffmann, Marco B. de Andrade, A. Martinelli

{"title":"Anatomy of the holotype of ‘Probelesodon’ kitchingi revisited, a chiniquodontid cynodont (Synapsida, Probainognathia) from the early Late Triassic of southern Brazil","authors":"C. Hoffmann, Marco B. de Andrade, A. Martinelli","doi":"10.1017/jpa.2023.25","DOIUrl":"https://doi.org/10.1017/jpa.2023.25","url":null,"abstract":"Abstract. Chiniquodontidae is a family of nonmammaliaform probainognathian cynodonts with occurrences in the Middle to Late Triassic of Africa and South America (Brazil and Argentina). The history of the family is marked by changes in composition and revisions due to the poor preservation of the first discovered specimens. Currently, Chiniquodontidae includes two genera and six species. Here, we apply the computed tomography (CT-scan) method to describe and revise the morphology of one of the best-preserved chiniquodontid specimens (MCP 1600 PV, holotype of ‘Probelesodon’ kitchingi Sá-Teixeira, 1982) from Brazil, which allowed the visualization of sutures and the segmentation of each bone. The CT-scan data also revealed some previously undescribed traits due to the presence of matrix covering structures of the skull. In addition, the morphological comparisons revealed differences of MCP 1600 PV in relation to the other chiniquodontids, and eight discrete cranial features not related to ontogeny indicate that ‘Probelesodon’ kitchingi might not be included within Chiniquodon theotonicus Huene, 1936. Therefore, we consider the species valid but propose the new combination Chiniquodon kitchingi. Moreover, the results obtained highlighted the necessity of a reassessment of the family, as well as the description of new specimens, morphometric analyses, and use of CT-scan, when feasible.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"693 - 710"},"PeriodicalIF":1.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43378804","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

JPA volume 97 issue 3 Cover JPA第97卷第3期封面

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.43

引用次数: 0

Trilobites from the Cedaria prolifica Zone (Cambrian, upper Guzhangian) of the Precordillera of Mendoza, western Argentina 阿根廷西部门多萨前科雪松多产带（寒武纪，上古章阶）的三叶虫

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.34

M. F. Tortello

{"title":"Trilobites from the Cedaria prolifica Zone (Cambrian, upper Guzhangian) of the Precordillera of Mendoza, western Argentina","authors":"M. F. Tortello","doi":"10.1017/jpa.2023.34","DOIUrl":"https://doi.org/10.1017/jpa.2023.34","url":null,"abstract":"Abstract. Trilobites from the upper Guzhangian of the southern Argentine Precordillera, preliminarily described by Carlos Rusconi in the 1950s, are revised herein. The specimens studied were collected from an allochthonous limestone block of La Cruz Olistoliths at 200 m northwest of Estancia San Isidro locality (San Isidro area, Mendoza). Taxa comprise Kormagnostus seclusus (Walcott, 1884), Cedaria prolifica Walcott, 1924, C. puelchana Rusconi, 1954, Tricrepicephalus texanus (Shumard, 1861), Meteoraspis metra (Walcott, 1890), Coosia conicephala (Rusconi, 1954) new combination, Coosella texana? Resser, 1942, Nasocephalus cf. N. nasutus Wilson, 1954, and Olenoides proa (Rusconi, 1954) new combination. The North American genera Meteoraspis Resser, 1935 and Nasocephalus Wilson, 1954 are reported confidently from South America for the first time. This assemblage is representative of the Cedaria prolifica Zone, which correlates with the lower Crepicephalus Zone of the traditional North American genus-based zonation. Most of the genera and species identified were previously described exclusively from Canada, the United States, and northwestern Mexico, a fact that provides new support to an allochthonous Laurentian origin of the Argentine Precordillera.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"591 - 605"},"PeriodicalIF":1.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46623790","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

Crinoids from the Wooster Shale Member of the Cuyahoga Formation, Carboniferous (Mississippian, Tournaisian) of northeastern Ohio 俄亥俄州东北部石炭纪(密西西比、图尔奈)凯霍加组伍斯特页岩段的海百合

IF 1.4 4区地球科学

Journal of Paleontology Pub Date : 2023-05-01 DOI: 10.1017/jpa.2023.20

W. Ausich, Mark A. Wilson

{"title":"Crinoids from the Wooster Shale Member of the Cuyahoga Formation, Carboniferous (Mississippian, Tournaisian) of northeastern Ohio","authors":"W. Ausich, Mark A. Wilson","doi":"10.1017/jpa.2023.20","DOIUrl":"https://doi.org/10.1017/jpa.2023.20","url":null,"abstract":"Abstract. Nine crinoids are described from the Wooster Shale Member of the Cuyahoga Formation from Wayne and Ashland counties, Ohio, USA. Identifiable elements of the fauna include five camerate crinoids, one flexible crinoid, and three other eucladid crinoids. Five new species are described, including Cactocrinus woosterensis n. sp., Cusacrinus brushi n. sp., Agaricocrinus murphyi n. sp., Decadocrinus laevis n. sp., and Decadocrinus inordinatus n. sp. Overall, the distribution of crinoid clades in the Wooster Shale is similar to that of the stratigraphically lower Meadville Shale Member of the Cuyahoga Formation, although less diverse and with only one species (Cyathocrinites simplex) in common. Many of the Wooster Shale Member crinoids are completely or partially preserved with siderite either in nodules or within siderite beds. These crinoids are commonly preserved in trauma postures, which is characteristic of burial in episodic high turbulence events. The paleoenvironments and taxa of the two Cuyahoga Formation crinoid faunas more closely resemble Viséan faunas in siliciclastic settings than typical carbonate faunas of the Tournaisian.","PeriodicalId":50098,"journal":{"name":"Journal of Paleontology","volume":"97 1","pages":"652 - 674"},"PeriodicalIF":1.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42653240","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