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Actualistic Taphonomy in South America. 南美洲的现实Taphonomy。
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-03-18 DOI: 10.5710/1851-8044-58.1.72
Devapriya Chattopadhyay
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引用次数: 0
The Earliest Known Titanosaur Sauropod Dinosaur 已知最早的泰坦巨龙蜥脚类恐龙
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-02-28 DOI: 10.5710/AMGH.20.08.2020.3376
P. Gallina, J. Canale, J. Carballido
Abstract. The titanosaur sauropod record of Patagonia, mainly recovered from Upper Cretaceous strata, is probably the richest worldwide. Here we present a new sauropod dinosaur, Ninjatitan zapatai gen. et sp. nov., from the Lower Cretaceous Bajada Colorada Formation (Berriasian–Valanginian) of north Patagonia (Neuquén Province, Argentina), from which postcranial remains are preserved. The anatomical analysis and comparisons performed in this specimen evidence strong affinity with titanosaur sauropods. This assumption is corroborated with the inclusion of the new taxon in an updated phylogenetic data matrix. The cladistic analyses indicate that Ninjatitan could be considered the earliest known titanosaur sauropod. The combination of features such as the presence of procoelous anterior caudal centra, the pneumatized neural arch of anterior caudal vertebrae, and the posterodorsal border of the scapular acromion near the glenoid level supports its titanosaur affinities. The presence of a basal titanosaurian sauropod in the lowermost Cretaceous of Patagonia supports the hypothesis that the group was established in the Southern Hemisphere and reinforces the idea of a Gondwanan origin for Titanosauria. The Bajada Colorada sauropod fauna represents one of the most diverse and unique associations from the lowermost Cretaceous worldwide recorded.
摘要巴塔哥尼亚的泰坦巨龙类蜥脚类记录主要来自上白垩纪地层,可能是世界上最丰富的。在这里,我们展示了一种新的蜥脚类恐龙,Ninjatitan zapatai gen.et sp.nov.,来自巴塔哥尼亚北部(阿根廷诺伊肯省)的下白垩纪Bajada Colorada组(Berriasian–Valangianian),其颅后遗骸保存于该组。对该标本进行的解剖分析和比较表明,它与蜥脚类泰坦巨龙有很强的亲缘关系。这一假设通过将新分类单元纳入更新的系统发育数据矩阵得到了证实。支序分析表明,忍者龙可能被认为是已知最早的泰坦巨龙类蜥脚类恐龙。这些特征的结合,如前尾前中央的存在,前尾椎骨的气动神经弓,以及肩胛肩峰在关节盂水平附近的后气味边界,支持了其与泰坦巨龙的亲缘关系。巴塔哥尼亚白垩纪最下层存在一种基底泰坦巨龙类蜥脚类恐龙,这支持了该类群成立于南半球的假设,并强化了泰坦巨龙起源于冈瓦纳大陆的观点。Bajada Colorada蜥脚类动物群是世界上有记录以来最底层白垩纪最多样、最独特的组合之一。
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引用次数: 16
The Fossil Record of Camelids (Mammalia, Cetartiodactyla) in Tucumán Province, Northwestern Argentina 阿根廷西北部图库曼省骆驼类动物化石记录
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-02-28 DOI: 10.5710/AMGH.27.11.2020.3353
Vanessa Torres-Carro, D. Garcia-Lopez, P. Ortiz
Abstract. The presence of fossil camelids in Tucumán, northwestern Argentina, has been recognized for many years but its relevance has not been fully evaluated so far. Here, we review previous mentions of fossil camelids for this province, present new material, and compare it with fossil and extant specimens of South American camelids, clarifying its taxonomic context and discussing its paleobiogeographic significance. For Tucumán we recognize Vicugna vicugna (Tafí del Valle Formation, late Pleistocene–early Holocene) and Palaeolama sp. (Tucumán Formation, late Pleistocene), mainly based on size and dental features. The current distribution of V. vicugna is restricted to the Central Andes, in the Puna and High Andean environments over 3200 m altitude; there is no mention, neither current nor historical, for Tucumán. Its presence at around 2200 m in the Tafí valley during the Quaternary indicates cooler and drier conditions than those currently established. The observations made in the context of this contribution allow us to establish that the species V. provicugna is a synonym of V. vicugna. In turn, we consider that the validity of the species Palaeolama hoffstetteri, only based on postcranial remains, should be properly evaluated in the future.
摘要在阿根廷西北部Tucumán发现骆驼类化石已经有很多年了,但是它的相关性到目前为止还没有得到充分的评估。在此,我们回顾了前人对本省骆驼类化石的报道,提出了新的材料,并将其与化石和现存的南美骆驼类标本进行了比较,澄清了其分类背景,讨论了其古生物地理意义。对于Tucumán,我们主要根据大小和牙齿特征识别Vicugna Vicugna (Tafí del Valle组,晚更新世-全新世早期)和Palaeolama sp. (Tucumán组,晚更新世)。骆马目前的分布局限于安第斯山脉中部、海拔3200米以上的普纳和高安第斯山脉环境;无论是现在还是过去,都没有提到Tucumán。在第四纪期间,它在Tafí山谷2200米左右的位置存在,表明条件比目前确定的更冷和更干燥。在这一贡献的背景下所作的观察使我们能够确定,物种V. provicugna是V. vicugna的同义词。因此,我们认为,仅基于颅后遗骨,应该在未来适当地评估该物种的有效性。
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引用次数: 0
Revision of Botrychiopsis plantiana: A Key Species of the Gzhelian–Cisuralian in Westernmost Gondwana 冈瓦纳大陆最西部葛里阶-西苏里阶的一个关键种植物Botrychiopsis plantiana的修订
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-02-28 DOI: 10.5710/AMGH.28.09.2020.3355
Johana A. Fernández
Abstract. Botrychiopsis is an important biostratigraphic index taxon for Carboniferous–early Permian plant fossil successions of Gondwana. Its species have wide geographic distributions, restricted chronostratigraphic ranges, and are associated with diverse groups of plant associations. They have been described from sedimentary sequences of Australia, India, South Africa, Brazil, and Argentina. A whole-frond reconstruction of Botrychiopsis plantiana is presented based on a study of very well preserved specimens from the Gangamopteris flora (Ghzelian–Asselian) of the Bajo de Véliz Formation (Paganzo Basin, Argentina). The material consists of impressions of complete fronds and basal fragments, which are rarely represented in the Gondwanan upper Paleozoic fossil record.
摘要芽孢藓是冈瓦纳石炭纪-早二叠世植物化石演替的重要生物地层指标分类群。其物种地理分布广泛,年代地层范围有限,并与多种植物类群相关联。它们在澳大利亚、印度、南非、巴西和阿根廷的沉积序列中被描述过。基于对阿根廷Paganzo盆地Bajo de vsamuliz地层Gangamopteris植物区系(Ghzelian-Asselian)保存完好的标本的研究,提出了plantiana Botrychiopsis的整体重建。材料由完整的叶状印痕和基底碎片组成,这在冈瓦南上古生界化石记录中是罕见的。
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引用次数: 0
New Insights on Pachybiotherium illuminatum(Mammalia, Marsupialia, Microbiotheriidae) from the Early Miocene of the Pinturas Formation (Santa Cruz Province, Argentina) 阿根廷圣克鲁斯省Pinturas组早中新世光照厚生兽(哺乳目,有袋目,微生物科)的新认识
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-02-28 DOI: 10.5710/AMGH.01.09.2020.3371
Germán Barmak, L. Chornogubsky, L. Gaetano
This work describes two new materials corresponding to Pachybiotherium illuminatum, a microbiotheriid from Pinturas Formation (early Miocene, Santa Cruz Province, Argentina) previously reported at the lower levels of the Formation on Portezuelo Sumich Sur, now recorded in lower levels of Portezuelo Sumich Norte and the possibly upper levels of Los Toldos Sur localities. The new specimens offer a better understanding of P. illuminatum upper molars morphology and, if the level assignation was correct, allow us to argue that 1) P. illuminatum is reported for the first time as appearing on a typical Santacrucian fauna; 2) the “Pinturan” and Santacrucian faunas at the Rio Pinturas localities are more similar than previously reported; 3) the biochron of the species is extended.
这项工作描述了两种与Pachybiotherium illuminum相对应的新材料,Pachybiotherium illuminum是一种来自Pinturas组(中新世早期,阿根廷圣克鲁斯省)的微生物群系,以前在南苏密赫港的低层地层中报道过,现在在北苏密赫门的低层和可能的南洛斯托多斯地区的高层地层中记录过。这些新标本更好地了解了发光乳杆菌上臼齿的形态,如果水平分配正确,我们可以认为:1)发光乳杆菌首次被报道出现在典型的圣诞老人动物群中;2) Rio Pinturas地区的“Pinturan”和Santacracian动物群比之前报道的更相似;3) 该物种的生物芯片得到扩展。
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引用次数: 0
Mites (Acari, Oribatida, Nanhermannidae) from the Eocene of Patagonia: First Southern Hemisphere Fossil Record in Marine Sediments 巴塔哥尼亚始新世的螨类(蜱螨,恙螨科,Nanhermannidae):南半球海洋沉积物的首个化石记录
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-02-28 DOI: 10.5710/AMGH.26.06.2020.3354
D. Fernández, P. Martínez, L. Palazzesi, V. Barreda
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引用次数: 0
Advances in South American Micropaleontology. Selected Papers of the 11th Argentine Paleontological Congress 南美洲微词学进展。第十一届阿根廷古生物学大会论文选集
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2021-01-07 DOI: 10.5710/1851-8044-57.6.625
G. Hassan
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引用次数: 0
‘A Very Lazy Deer': Revision of the Cotype Of Nothropus carcaranensis (Mammalia, Xenarthra) “一只非常懒惰的鹿”:carcaranensis Nothropus Cotype的修订(哺乳动物,异种关节动物)
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2020-12-18 DOI: 10.5710/AMGH.30.07.2020.3368
R. Vezzosi, A. Rotti, Leonardo Dos Santos Avilla
Here it is reviewed the specimen MACN-Pv 12630, the cotype of the ground-sloth Nothrophus cararanensis Bordas, 1942, and proposed that it should be taxonomically relocated to the extinct deer Morenelaphus. The specimen in question is represented by a fragmentary braincase, that shares several features with Cervidae and, more detailed with Morenelaphus. Besides antler morphology, this contribution shows that basicranium attributes are also very important to elucidate taxonomical affinities within South American Cervidae.
在这里,我们回顾了地懒Nothrophus cararanensis Bordas的同型标本MACN Pv 12630,1942年,并提出它应该在分类学上重新定位到已灭绝的鹿Morenelaphus。该标本由一个零碎的脑壳代表,该脑壳与鹿科有几个共同特征,更详细地说,与Morenelaphus有几个特征。除了鹿角形态外,这一贡献表明,基本特征对阐明南美鹿科的分类亲缘关系也非常重要。
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引用次数: 2
The Late Triassic World. Earth in a Time of Transition 晚三叠纪世界地球在一个过渡时期
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2020-12-18 DOI: 10.5710/1851-8044-57.6.623
A. Mancuso
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引用次数: 1
Passive-Dynamic Walkers of the Late Paleozoic 晚古生代的被动动态步行者
IF 1 4区 地球科学 Q3 PALEONTOLOGY Pub Date : 2020-12-18 DOI: 10.5710/AMGH.15.05.2020.3285
A. Kuznetsov
Abstract. Two upper Permian trackways attributed to the ichnogenus Sukhonopus, regarded as pareiasaurian, have been studied. The longer trackway includes 15.5 locomotor cycles. Statistical analysis of its dimensions indicated that the gait was a lateral-sequence walk close to the slow pace. This conclusion gained additional support through a comparison of dimensions of the two trackways with the glenoacetabular-to-pes length ratio measured on the skeletons of the pareiasaur Deltavjatia. With the sprawling limb posture typical to lower tetrapods, the pace can only be performed with body rocking from side to side, according to the principles of passive-dynamic walking. A natural-sized model of the Sukhonopus producer was built. This model reproduces the passive-dynamic rocking pace, being driven manually by pulling it forward by the rope and simultaneously pushing it from side to side. The passive-dynamic rocking pace of pareiasaurs, proved to be feasible by the model, requires functional differentiation of the hindlimbs and the forelimbs. The former were more appropriate for propulsion, while the latter were more efficient in the generation of the transverse forces required to pump the rocking motion. It is hypothesized that this walking mechanism was associated with an archaic deficiency of nervous and muscular supply of the limbs. Possibly, it was also employed by some other Paleozoic tetrapods. The ichnological evidence of this locomotion technique is the inward turn of the forelimb footprints. The histological evidence is the extensive development in the long limb elements of spongy bone tissue which helps dampen collisions associated with rocking.
摘要研究了两条上二叠纪的苏科龙属(ichnogenus Sukhonopus)的足迹,被认为是pareiasaurian。较长的轨道包括15.5个机车周期。对其维数的统计分析表明,步态是一种接近慢步的横向序列行走。这一结论通过对两条轨迹的尺寸与在Deltavjatia异角龙骨骼上测量的髋臼与骨臼长度之比的比较得到了额外的支持。由于下肢四足动物典型的四肢伸展姿势,根据被动动态行走的原则,只能通过身体左右摇摆来进行步伐。制作了一个自然大小的Sukhonopus生产者模型。这个模型再现了被动动态摇摆的步伐,通过绳子将其向前拉,同时将其从一侧推到另一侧来手动驱动。该模型证明了翼龙的被动动态摇摆速度是可行的,但需要对后肢和前肢进行功能区分。前者更适合于推进,而后者则更有效地产生推动摇摆运动所需的横向力。据推测,这种行走机制与古代四肢神经和肌肉供应的缺乏有关。古生代的其他四足动物也可能使用这种方法。这种运动技术的技术证据是前肢脚印向内弯曲。组织学证据是海绵状骨组织的长肢元素的广泛发展,这有助于抑制与摇晃有关的碰撞。
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引用次数: 1
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Ameghiniana
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