Vertebrate Anatomy Morphology Palaeontology最新文献

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Cranial ornamentation of a large Brachydectes newberryi (Recumbirostra: Lysorophia) from Linton, Ohio. 俄亥俄州林顿的一种大的短爪新浆果(蛭形目:溶血菌属)的颅骨装饰。
Vertebrate Anatomy Morphology Palaeontology Pub Date : 2018-10-06 DOI: 10.18435/VAMP29341
Arjan Mann
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引用次数: 3
Allometric growth in the skull of Tylosaurus proriger (Squamata: Mosasauridae) and its taxonomic implications 暴龙颅骨的异速生长及其分类学意义
Vertebrate Anatomy Morphology Palaeontology Pub Date : 2018-07-23 DOI: 10.18435/VAMP29339
R. Stewart, Jordan C. Mallon
{"title":"Allometric growth in the skull of Tylosaurus proriger (Squamata: Mosasauridae) and its taxonomic implications","authors":"R. Stewart, Jordan C. Mallon","doi":"10.18435/VAMP29339","DOIUrl":"https://doi.org/10.18435/VAMP29339","url":null,"abstract":"Ontogeny—the growth and development of an organism—is among the more poorly understood aspects of the life history of mosasaurs, largely owing to a dearth of fossil material from young individuals. We describe the partial and complete skulls of two subadult individuals of the mosasaurid Tylosaurus proriger from the upper Smoky Hills Chalk Member of the Niobrara Formation in Kansas. We include the more complete of the two specimens in an allometric analysis to better understand proportional changes of the skull through growth. Although our small sample size produces several instances of ‘soft isometry’, we recover the length of the edentulous rostrum as significantly negatively allometric, and quadrate height as significantly positively allometric. In light of our findings, we go on to consider the question of whether T. kansasensis represents an immature ontogimorph of T. nepaeolicus, but find no convincing evidence that this is the case.","PeriodicalId":256887,"journal":{"name":"Vertebrate Anatomy Morphology Palaeontology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116669397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Response to Brownstein (2018) ‘Rebuttal of McFeeters, Ryan and Cullen, 2018’ 对布朗斯坦(2018)《麦克菲特斯、瑞安和卡伦的反驳》的回应
Vertebrate Anatomy Morphology Palaeontology Pub Date : 2018-07-16 DOI: 10.18435/VAMP29343
Bradley McFeeters, Michael J. Ryan, T. Cullen
{"title":"Response to Brownstein (2018) ‘Rebuttal of McFeeters, Ryan and Cullen, 2018’","authors":"Bradley McFeeters, Michael J. Ryan, T. Cullen","doi":"10.18435/VAMP29343","DOIUrl":"https://doi.org/10.18435/VAMP29343","url":null,"abstract":"<jats:p>n/a</jats:p>","PeriodicalId":256887,"journal":{"name":"Vertebrate Anatomy Morphology Palaeontology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133728046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Rebuttal of McFeeters, Ryan and Cullen, 2018, ‘Positional variation in pedal unguals of North American ornithomimids (Dinosauria, Theropoda): A Response to Brownstein (2017)’ 对mcfeters, Ryan和Cullen的反驳,2018,“北美鸟脚类(恐龙,兽脚目)足跖类的位置变化:对Brownstein(2017)的回应”
Vertebrate Anatomy Morphology Palaeontology Pub Date : 2018-07-16 DOI: 10.18435/VAMP29340
C. Brownstein
{"title":"Rebuttal of McFeeters, Ryan and Cullen, 2018, ‘Positional variation in pedal unguals of North American ornithomimids (Dinosauria, Theropoda): A Response to Brownstein (2017)’","authors":"C. Brownstein","doi":"10.18435/VAMP29340","DOIUrl":"https://doi.org/10.18435/VAMP29340","url":null,"abstract":"The Arundel Clay of Maryland is among the only Early Cretaceous terrestrial units known from eastern North America. Research on some theropod dinosaur bones from this layer has indicated the presence of two ornithomimosaur taxa in the assemblage. However, a recent paper discussed issues with the definite assignment of any of these unguals to Ornithomimosauria and suggested that morphological differences originally interpreted to be indicative of the presence of two ornithomimosaurs could be explained by positional variation. Here, I show that substantial evidence persists for the presence of two ornithomimosaurs in the Arundel Clay assemblage, even considering the recent description of positional variation in ornithomimosaur pedal unguals. Furthermore, the argument against the confident assignment of these unguals to ornithomimosaurs is shown to be based on oversimplified comparisons that do not take into account the combination of features in the Arundel specimens that allow for their assignment to that clade. Although several small points made in the initial paper describing the Arundel specimens are incorrect or unsubstantiated, the differences between the Maryland unguals are outside the spectrum of positional variation and are indicative of the presence of two ornithomimosaurs in the Arundel Clay assemblage.","PeriodicalId":256887,"journal":{"name":"Vertebrate Anatomy Morphology Palaeontology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129458719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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