Pub Date : 2024-03-14DOI: 10.35463/j.apr.2024.02.02
Felix Schlagintweit
The much-cited importance of Orbitolinidae in biostratigraphy depends on the species and time-interval under consideration. In any case, correct species identification is of primary importance as the basis for drawing conclusions. This task is best achieved in an assemblage where centered sections (axial and transverse) showing all details of the complex megalospheric embryo are available. Difficulties in the correct interpretation of oblique sections is exemplified by an example from the Aptian of Turkey, respectively Praeorbitolina versus Mesorbitolina. Resulting differences in species determination not only has an impact on age interpretation, but also associated geologic-tectonic conclusions, as well as basic taxonomic data (e.g., stratigraphic ranges, statistics on stage diversities).
{"title":"CHALLENGES IN ORBITOLINID IDENTIFICATION AND BIOSTRATIGRAPHIC CONSEQUENCES: AN APTIAN EXAMPLE","authors":"Felix Schlagintweit","doi":"10.35463/j.apr.2024.02.02","DOIUrl":"https://doi.org/10.35463/j.apr.2024.02.02","url":null,"abstract":"The much-cited importance of Orbitolinidae in biostratigraphy depends on the species and time-interval under consideration. In any case, correct species identification is of primary importance as the basis for drawing conclusions. This task is best achieved in an assemblage where centered sections (axial and transverse) showing all details of the complex megalospheric embryo are available. Difficulties in the correct interpretation of oblique sections is exemplified by an example from the Aptian of Turkey, respectively Praeorbitolina versus Mesorbitolina. Resulting differences in species determination not only has an impact on age interpretation, but also associated geologic-tectonic conclusions, as well as basic taxonomic data (e.g., stratigraphic ranges, statistics on stage diversities).","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"17 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140242301","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}
Pub Date : 2024-03-11DOI: 10.35463//j.apr.2024.02.01
V. Dernov
Beloptera longa Naef, 1922 and Beloptera aff. longa Naef, 1922 have been described from the Priabonian Mandrykivka Beds of the Rybalsky Quarry Konzentrat-Lagerstätte in addition to previously known Beloptera belemnoidea de Blainville, 1825, B. cf. longa Naef, 1922, Belosaepia blainvillei (Deshayes, 1835) and Vasseuria occidentalis Munier-Chalmas, 1880. The geographical and stratigraphic distribution of the species Beloptera longa, which was previously recorded only in the Bartonian of England, has been expanded. Cephalopod assemblages from the Priabonian of Ukrainian consist of the genera Beloptera, Vasseuria, Belosaepia, Aturia and Eutrephoceras.
除了之前已知的 Beloptera belemnoidea de Blainville, 1825、B. cf. longa Naef, 1922、Belosaepia blainvillei (Deshayes, 1835) 和 Vasseuria occidentalis Munier-Chalmas, 1880 外，还描述了来自 Rybalsky Quarry Konzentrat-Lagerstätte 的 Priabonian Mandrykivka 床的 Beloptera longa Naef, 1922 和 Beloptera aff.Beloptera longa 这一物种以前仅在英格兰的巴顿期有记录，其地理分布和地层分布已得到扩展。乌克兰普里阿本纪的头足类组合包括 Beloptera 属、Vasseuria 属、Belosaepia 属、Aturia 属和 Eutrephoceras 属。
{"title":"BELOPTERA LONGA NAEF, 1922 (CEPHALOPODA: COLEOIDEA) FROM THE LATE EOCENE (PALAEOGENE) OF UKRAINE","authors":"V. Dernov","doi":"10.35463//j.apr.2024.02.01","DOIUrl":"https://doi.org/10.35463//j.apr.2024.02.01","url":null,"abstract":"Beloptera longa Naef, 1922 and Beloptera aff. longa Naef, 1922 have been described from the Priabonian Mandrykivka Beds of the Rybalsky Quarry Konzentrat-Lagerstätte in addition to previously known Beloptera belemnoidea de Blainville, 1825, B. cf. longa Naef, 1922, Belosaepia blainvillei (Deshayes, 1835) and Vasseuria occidentalis Munier-Chalmas, 1880. The geographical and stratigraphic distribution of the species Beloptera longa, which was previously recorded only in the Bartonian of England, has been expanded. Cephalopod assemblages from the Priabonian of Ukrainian consist of the genera Beloptera, Vasseuria, Belosaepia, Aturia and Eutrephoceras.","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"46 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140252993","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}
Pub Date : 2024-02-11DOI: 10.35463/j.apr.2024.01.06
Chan-gyu Yun
Fragmentary but scientifically important pterosaur fossils have been reported in Lower Cretaceous strata such as the Jinju and Hasandong formations of South Korea. Recently, several large teeth and a second wing phalanx found in these strata have been suggested to have affinities with Boreopteridae, a clade in which has so far been reported only in the Yixian Formation of China. Here, the phylogenetic affinities of these proposed boreopterid specimens are reassessed, using two-dimensional geometric morphometric shape analyses. The morphometric analyses found the South Korean pterosaur teeth in different morphospaces from the Yixian Fm. boreopterids, and plot them closer to anhanguerians. An isolated second wing phalanx does plot close to a boreopterid Zhenyuanopterus longirostris in a morphospace defined by first two principal component axes, but taxa from different lineages are also plotted as closely, or even closer. Thus, there seems to be no clear evidence that these specimens belong to Boreopteridae, and the tooth fossils appear to be very different from those of established members of this clade. Therefore, the hypothesis that some South Korean pterosaur fossils can be referred to boreopterids, is here tentatively rejected.
{"title":"GEOMETRIC MORPHOMETRIC APPROACH TO ESTABLISH PHYLOGENETIC AFFINITIES OF ENIGMATIC PTEROSAUR SPECIMENS FROM THE LOWER CRETACEOUS OF SOUTH KOREA","authors":"Chan-gyu Yun","doi":"10.35463/j.apr.2024.01.06","DOIUrl":"https://doi.org/10.35463/j.apr.2024.01.06","url":null,"abstract":"Fragmentary but scientifically important pterosaur fossils have been reported in Lower Cretaceous strata such as the Jinju and Hasandong formations of South Korea. Recently, several large teeth and a second wing phalanx found in these strata have been suggested to have affinities with Boreopteridae, a clade in which has so far been reported only in the Yixian Formation of China. Here, the phylogenetic affinities of these proposed boreopterid specimens are reassessed, using two-dimensional geometric morphometric shape analyses. The morphometric analyses found the South Korean pterosaur teeth in different morphospaces from the Yixian Fm. boreopterids, and plot them closer to anhanguerians. An isolated second wing phalanx does plot close to a boreopterid Zhenyuanopterus longirostris in a morphospace defined by first two principal component axes, but taxa from different lineages are also plotted as closely, or even closer. Thus, there seems to be no clear evidence that these specimens belong to Boreopteridae, and the tooth fossils appear to be very different from those of established members of this clade. Therefore, the hypothesis that some South Korean pterosaur fossils can be referred to boreopterids, is here tentatively rejected.","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"21 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139845757","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}
Pub Date : 2024-02-11DOI: 10.35463/j.apr.2024.01.06
Chan-gyu Yun
Fragmentary but scientifically important pterosaur fossils have been reported in Lower Cretaceous strata such as the Jinju and Hasandong formations of South Korea. Recently, several large teeth and a second wing phalanx found in these strata have been suggested to have affinities with Boreopteridae, a clade in which has so far been reported only in the Yixian Formation of China. Here, the phylogenetic affinities of these proposed boreopterid specimens are reassessed, using two-dimensional geometric morphometric shape analyses. The morphometric analyses found the South Korean pterosaur teeth in different morphospaces from the Yixian Fm. boreopterids, and plot them closer to anhanguerians. An isolated second wing phalanx does plot close to a boreopterid Zhenyuanopterus longirostris in a morphospace defined by first two principal component axes, but taxa from different lineages are also plotted as closely, or even closer. Thus, there seems to be no clear evidence that these specimens belong to Boreopteridae, and the tooth fossils appear to be very different from those of established members of this clade. Therefore, the hypothesis that some South Korean pterosaur fossils can be referred to boreopterids, is here tentatively rejected.
{"title":"GEOMETRIC MORPHOMETRIC APPROACH TO ESTABLISH PHYLOGENETIC AFFINITIES OF ENIGMATIC PTEROSAUR SPECIMENS FROM THE LOWER CRETACEOUS OF SOUTH KOREA","authors":"Chan-gyu Yun","doi":"10.35463/j.apr.2024.01.06","DOIUrl":"https://doi.org/10.35463/j.apr.2024.01.06","url":null,"abstract":"Fragmentary but scientifically important pterosaur fossils have been reported in Lower Cretaceous strata such as the Jinju and Hasandong formations of South Korea. Recently, several large teeth and a second wing phalanx found in these strata have been suggested to have affinities with Boreopteridae, a clade in which has so far been reported only in the Yixian Formation of China. Here, the phylogenetic affinities of these proposed boreopterid specimens are reassessed, using two-dimensional geometric morphometric shape analyses. The morphometric analyses found the South Korean pterosaur teeth in different morphospaces from the Yixian Fm. boreopterids, and plot them closer to anhanguerians. An isolated second wing phalanx does plot close to a boreopterid Zhenyuanopterus longirostris in a morphospace defined by first two principal component axes, but taxa from different lineages are also plotted as closely, or even closer. Thus, there seems to be no clear evidence that these specimens belong to Boreopteridae, and the tooth fossils appear to be very different from those of established members of this clade. Therefore, the hypothesis that some South Korean pterosaur fossils can be referred to boreopterids, is here tentatively rejected.","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"118 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139785568","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}
Pub Date : 2024-02-11DOI: 10.35463/j.apr.2024.01.05
P. Dumitrică
This paper is a continuation of a previous one in which I described and revised different Middle Triassic nassellarian Radiolaria from the Alps and Carpathians illustrated with drawings. On the present paper, are described two new groups of Middle Triassic dicyrtid Nassellaria with bell-shaped shell from the same area to enrich the inventory of these microfossils. Two new families (Gorispelidae and Humerocyrtiidae), five new genera (Silicotintinnabulum, Colpotrelus, Gorispela, Pozsvartia and Humerocyrtis) and 30 new species are described from these genera and illustrated with drawings.
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Pub Date : 2024-02-11DOI: 10.35463/j.apr.2024.01.07
D. Țabără, Z. Csiki-Sava
A palynological, palynofacies and organic geochemical investigation of the Upper Cretaceous continental vertebrate site of Oarda de Jos allowed us to constrain its age and to make more detailed inferences about its depositional environment. The recovered palynomorph assemblage is represented mainly by angiosperm pollen and fern spores, alongside rare taxa of gymnosperms. Biostratigraphically significant taxa identified in the assemblage restrict the age of the studies deposits to the later early Maastrichtian. The palynofloral evidence indicates plant communities that mainly preferred higher-altitude areas and cooler-wetter conditions. However, a spore and pollen assemblage which derives from vegetation typical of lacustrine areas or riverbanks also occurs in the studied deposits. The studied palynoflora shows quite significant differences compared to previously published palynological assemblages from the same geological unit (the Sebeș Formation), although from deposits located slightly to the north, at Pâclișa. Organic geochemical data show that certain organic biomarkers such as n-alkanes n-C16 to n-C18 reach the highest values, and indicate that they may derive from freshwater colonial green algae such as Scenedesmus. The palynofacies constituents used to reconstruct the depositional environment suggest an exclusive terrestrial organic matter deposited in a stagnant-water fluvial/lacustrine environment.
通过对上白垩世 Oarda de Jos 大陆脊椎动物遗址的古生物学、古地貌学和有机地球化学调查，我们得以确定该遗址的年龄，并对其沉积环境做出更详细的推断。所发现的古动物群主要是被子植物花粉和蕨类植物孢子，以及罕见的裸子植物类群。从生物地层学的角度来看，在该组合中发现的重要类群将研究沉积的年代限定在晚马斯特里赫特早期。古植物证据表明，植物群落主要喜欢海拔较高的地区和凉爽潮湿的环境。不过，在所研究的沉积物中也出现了源自湖沼地区或河岸典型植被的孢子和花粉组合。所研究的古植物群落与之前公布的同一地质单元（塞贝雅地层）的古植物群落相比，差异非常明显，尽管这些古植物群落来自稍靠北的帕克里雅沉积层。有机地球化学数据显示，某些有机生物标志物（如 n-C16 至 n-C18 烷烃）达到了最高值，表明它们可能来自淡水殖民绿藻（如 Scenedesmus）。用于重建沉积环境的古乐彩网成分表明，只有陆地有机物沉积在死水河/湖泊环境中。
{"title":"PALYNOSTRATIGRAPHIC AND PALAEOENVIRONMENTAL INVESTIGATIONS OF THE MAASTRICHTIAN FROM OARDA DE JOS (SOUTHWESTERN TRANSYLVANIAN BASIN)","authors":"D. Țabără, Z. Csiki-Sava","doi":"10.35463/j.apr.2024.01.07","DOIUrl":"https://doi.org/10.35463/j.apr.2024.01.07","url":null,"abstract":"A palynological, palynofacies and organic geochemical investigation of the Upper Cretaceous continental vertebrate site of Oarda de Jos allowed us to constrain its age and to make more detailed inferences about its depositional environment. The recovered palynomorph assemblage is represented mainly by angiosperm pollen and fern spores, alongside rare taxa of gymnosperms. Biostratigraphically significant taxa identified in the assemblage restrict the age of the studies deposits to the later early Maastrichtian. The palynofloral evidence indicates plant communities that mainly preferred higher-altitude areas and cooler-wetter conditions. However, a spore and pollen assemblage which derives from vegetation typical of lacustrine areas or riverbanks also occurs in the studied deposits. The studied palynoflora shows quite significant differences compared to previously published palynological assemblages from the same geological unit (the Sebeș Formation), although from deposits located slightly to the north, at Pâclișa. Organic geochemical data show that certain organic biomarkers such as n-alkanes n-C16 to n-C18 reach the highest values, and indicate that they may derive from freshwater colonial green algae such as Scenedesmus. The palynofacies constituents used to reconstruct the depositional environment suggest an exclusive terrestrial organic matter deposited in a stagnant-water fluvial/lacustrine environment.","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"104 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139785385","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}
Pub Date : 2024-02-11DOI: 10.35463/j.apr.2024.01.07
D. Țabără, Z. Csiki-Sava
A palynological, palynofacies and organic geochemical investigation of the Upper Cretaceous continental vertebrate site of Oarda de Jos allowed us to constrain its age and to make more detailed inferences about its depositional environment. The recovered palynomorph assemblage is represented mainly by angiosperm pollen and fern spores, alongside rare taxa of gymnosperms. Biostratigraphically significant taxa identified in the assemblage restrict the age of the studies deposits to the later early Maastrichtian. The palynofloral evidence indicates plant communities that mainly preferred higher-altitude areas and cooler-wetter conditions. However, a spore and pollen assemblage which derives from vegetation typical of lacustrine areas or riverbanks also occurs in the studied deposits. The studied palynoflora shows quite significant differences compared to previously published palynological assemblages from the same geological unit (the Sebeș Formation), although from deposits located slightly to the north, at Pâclișa. Organic geochemical data show that certain organic biomarkers such as n-alkanes n-C16 to n-C18 reach the highest values, and indicate that they may derive from freshwater colonial green algae such as Scenedesmus. The palynofacies constituents used to reconstruct the depositional environment suggest an exclusive terrestrial organic matter deposited in a stagnant-water fluvial/lacustrine environment.
通过对上白垩世 Oarda de Jos 大陆脊椎动物遗址的古生物学、古地貌学和有机地球化学调查，我们得以确定该遗址的年龄，并对其沉积环境做出更详细的推断。所发现的古动物群主要是被子植物花粉和蕨类植物孢子，以及罕见的裸子植物类群。从生物地层学的角度来看，在该组合中发现的重要类群将研究沉积的年代限定在晚马斯特里赫特早期。古植物证据表明，植物群落主要喜欢海拔较高的地区和凉爽潮湿的环境。不过，在所研究的沉积物中也出现了源自湖沼地区或河岸典型植被的孢子和花粉组合。所研究的古植物群落与之前公布的同一地质单元（塞贝雅地层）的古植物群落相比，差异非常明显，尽管这些古植物群落来自稍靠北的帕克里雅沉积层。有机地球化学数据显示，某些有机生物标志物（如 n-C16 至 n-C18 烷烃）达到了最高值，表明它们可能来自淡水殖民绿藻（如 Scenedesmus）。用于重建沉积环境的古乐彩网成分表明，只有陆地有机物沉积在死水河/湖泊环境中。
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Pub Date : 2024-02-11DOI: 10.35463/j.apr.2024.01.05
P. Dumitrică
This paper is a continuation of a previous one in which I described and revised different Middle Triassic nassellarian Radiolaria from the Alps and Carpathians illustrated with drawings. On the present paper, are described two new groups of Middle Triassic dicyrtid Nassellaria with bell-shaped shell from the same area to enrich the inventory of these microfossils. Two new families (Gorispelidae and Humerocyrtiidae), five new genera (Silicotintinnabulum, Colpotrelus, Gorispela, Pozsvartia and Humerocyrtis) and 30 new species are described from these genera and illustrated with drawings.
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Pub Date : 2023-10-18DOI: 10.35463/j.apr.2024.01.03
FELIX SCHLAGINTWEIT, MOHSEN YAZDI-MOGHADAM, BRUNO GRANIER, ROHOLLAH HOSSEINZADEH
The new larger benthic foraminifer Parurgonina valanginiana is described from the Valanginian deposits of the Fahliyan Formation of southwestern Iran (Zagros Zone). It is separated from the uppermost Oxfordian-lowermost Tithonian generotype P. caelinensis (Cuvillier et al.) by a distinct time gap. The Lower Cretaceous specimens exhibit a larger embryonic chamber whereas the internal structural and other biometric data are generally in conformity with the Upper Jurassic morphotypes. Besides the Middle Jurassic P. primaeva Kamoun & Peybernès and the Upper Jurassic P. caelinensis, P. valanginiana sp. nov. represents the third species of the genus described and possibly a Valanginian marker endemic for the Arabian Plate. In the Fahliyan Formation, P. valanginiana sp. nov. occurs in wackestones associated with Pseudocyclammina lituus (Yokoyama). Additional data for the micropalaeontological assemblages (benthic foraminifera, calcareous algae) of the shallow-water carbonates of the Fahliyan Formation are provided. As it is also the case in the United Arab Emirates (Granier, 2008), it is proposed that the Tithonian/Berriasian boundary does not, as generally indicated in the literature, coincide with the boundary of the Hith Formation and the Fahliyan Formation, but instead occurs within the latter. The new finds provide further evidence that the Tithonian/Berriasian boundary did not represent a major rupture or extinction for larger benthic foraminifera. On the contrary, the Berriasian/Valanginian boundary corresponds to a natural discontinuity (both sedimentological and biological) possibly enhanced by a hiatus of the upper Berriasian strata. The foraminiferal diversity remains quite high during early Valanginian times then falls drastically, which suggests that the Berriasian/Valanginian crisis is a double barelled crisis (first base Valanginian, second intra-Valanginian).
{"title":"PARURGONINA VALANGINIANA N. SP. FROM THE VALANGINIAN OF SW IRAN (ZAGROS ZONE): THE FIRST CRETACEOUS RECORD OF THE GENUS","authors":"FELIX SCHLAGINTWEIT, MOHSEN YAZDI-MOGHADAM, BRUNO GRANIER, ROHOLLAH HOSSEINZADEH","doi":"10.35463/j.apr.2024.01.03","DOIUrl":"https://doi.org/10.35463/j.apr.2024.01.03","url":null,"abstract":"The new larger benthic foraminifer Parurgonina valanginiana is described from the Valanginian deposits of the Fahliyan Formation of southwestern Iran (Zagros Zone). It is separated from the uppermost Oxfordian-lowermost Tithonian generotype P. caelinensis (Cuvillier et al.) by a distinct time gap. The Lower Cretaceous specimens exhibit a larger embryonic chamber whereas the internal structural and other biometric data are generally in conformity with the Upper Jurassic morphotypes. Besides the Middle Jurassic P. primaeva Kamoun & Peybernès and the Upper Jurassic P. caelinensis, P. valanginiana sp. nov. represents the third species of the genus described and possibly a Valanginian marker endemic for the Arabian Plate. In the Fahliyan Formation, P. valanginiana sp. nov. occurs in wackestones associated with Pseudocyclammina lituus (Yokoyama). Additional data for the micropalaeontological assemblages (benthic foraminifera, calcareous algae) of the shallow-water carbonates of the Fahliyan Formation are provided. As it is also the case in the United Arab Emirates (Granier, 2008), it is proposed that the Tithonian/Berriasian boundary does not, as generally indicated in the literature, coincide with the boundary of the Hith Formation and the Fahliyan Formation, but instead occurs within the latter. The new finds provide further evidence that the Tithonian/Berriasian boundary did not represent a major rupture or extinction for larger benthic foraminifera. On the contrary, the Berriasian/Valanginian boundary corresponds to a natural discontinuity (both sedimentological and biological) possibly enhanced by a hiatus of the upper Berriasian strata. The foraminiferal diversity remains quite high during early Valanginian times then falls drastically, which suggests that the Berriasian/Valanginian crisis is a double barelled crisis (first base Valanginian, second intra-Valanginian).","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135884880","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}
Pub Date : 2023-09-09DOI: 10.35463/j.apr.2024.01.02
CHAN-GYU YUN
Spinosaurids are a highly morphologically specialized clade of large tetanuran theropod dinosaurs, characterized by their proportionally long, narrow snouts and conical teeth with fluted surfaces. The unusual morphology of spinosaurids has been usually compared with modern crocodilians, but distinct differences between them have been reported as well. Here, numerous craniodental characters that are shared by spinosaurids and large, robust phytosaurs often termed as “brachyrostral” forms are reviewed. Phytosaurs are a clade of carnivorous archosauriforms that resemble crocodilians in overall morphology, and as such a similar lifestyle has been inferred for them as well. Although based on preliminary observations, the shared craniodental characters of spinosaurids and “brachyrostral” phytosaurs, including those not shared with crocodilians, raise the possibility that at least some aspects of the lifestyle of these extinct archosauriform clades were more similar to each other rather than to that of crocodilians.
{"title":"SPINOSAURS AS PHYTOSAUR MIMICS: A CASE OF CONVERGENT EVOLUTION BETWEEN TWO EXTINCT ARCHOSAURIFORM CLADES","authors":"CHAN-GYU YUN","doi":"10.35463/j.apr.2024.01.02","DOIUrl":"https://doi.org/10.35463/j.apr.2024.01.02","url":null,"abstract":"Spinosaurids are a highly morphologically specialized clade of large tetanuran theropod dinosaurs, characterized by their proportionally long, narrow snouts and conical teeth with fluted surfaces. The unusual morphology of spinosaurids has been usually compared with modern crocodilians, but distinct differences between them have been reported as well. Here, numerous craniodental characters that are shared by spinosaurids and large, robust phytosaurs often termed as “brachyrostral” forms are reviewed. Phytosaurs are a clade of carnivorous archosauriforms that resemble crocodilians in overall morphology, and as such a similar lifestyle has been inferred for them as well. Although based on preliminary observations, the shared craniodental characters of spinosaurids and “brachyrostral” phytosaurs, including those not shared with crocodilians, raise the possibility that at least some aspects of the lifestyle of these extinct archosauriform clades were more similar to each other rather than to that of crocodilians.","PeriodicalId":486764,"journal":{"name":"Acta Palaeontologica Romaniae","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136108079","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}
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