The excessive nutrients discharge from industrial and domestic sources have been contributing to the establishment of eutrophication conditions, particularly in chocked lagoons in the Neotropical region. This study evaluates the influence of organic matter on the foraminiferal and ostracode assemblages by combining biopolymers concentrations, sediment grain size, and physical and chemical parameters in the Marica-Guarapina Lagoon System (MGLS, Rio de Janeiro, Brazil). The physical-chemical parameters show a well-defined confinement gradient from the channel to the innermost region. The biopolymers analysis indicates that the Guarapina and Barra Lagoons are characterized by the highest values of organicmatter from anthropic origin. Living organisms are absent or poorly represented in most of these regions of Marica and Barra lagoons. Seventeen living species of foraminifera and five of ostracodea are identified in the MGLS. Foraminifera and ostracodea exhibit a negative relationship with organic matter as evidenced by statistical analysis. Quinqueloculina seminula (foraminifera) and Cyprideis spp. (ostracodea) are associated with shallow and sandy regions and Ammonia spp. to eutrophic areas. The cluster analysis identifies six distinct regions in theMGLS based on species distribution and their relationship with environmental parameters: I - a region under the influence of marine waters; II - shallow and sandy region with high concentrations of proteins; III - a region characterized by high aerobic microorganisms activity; IV - an impacted region that is the channel passage between the lagoons; V - the most stressed region of the lagoons; and VI - the most confined area of the MGLS.
{"title":"The influence of organic matter compounds on foraminiferal and ostracode assemblages: a case study from the Marica-Guarapina Lagoon System (Rio de Janeiro, Brazil)","authors":"L. Laut, I. Clemente, Wellen Louzada","doi":"10.47894/mpal.67.5.02","DOIUrl":"https://doi.org/10.47894/mpal.67.5.02","url":null,"abstract":"The excessive nutrients discharge from industrial and domestic sources have been contributing to the establishment of eutrophication conditions, particularly in chocked lagoons in the Neotropical region. This study evaluates the influence of organic matter on the foraminiferal and ostracode assemblages by combining biopolymers concentrations, sediment grain size, and physical and chemical parameters in the Marica-Guarapina Lagoon System (MGLS, Rio de Janeiro, Brazil). The physical-chemical parameters show a well-defined confinement gradient from the channel to the innermost region. The biopolymers analysis indicates that the Guarapina and Barra Lagoons are characterized by the highest values of organicmatter from anthropic origin. Living organisms are absent or poorly represented in most of these regions of Marica and Barra lagoons. Seventeen living species of foraminifera and five of ostracodea are identified in the MGLS. Foraminifera and ostracodea exhibit a negative relationship with organic matter as evidenced by statistical analysis. Quinqueloculina seminula (foraminifera) and Cyprideis spp. (ostracodea) are associated with shallow and sandy regions and Ammonia spp. to eutrophic areas. The cluster analysis identifies six distinct regions in theMGLS based on species distribution and their relationship with environmental parameters: I - a region under the influence of marine waters; II - shallow and sandy region with high concentrations of proteins; III - a region characterized by high aerobic microorganisms activity; IV - an impacted region that is the channel passage between the lagoons; V - the most stressed region of the lagoons; and VI - the most confined area of the MGLS.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445668","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}
A look back at the first contributors to this journal.
回顾本刊的第一批撰稿人。
{"title":"From the archives: The Micropaleontologist correspondents","authors":"J. A. Van Couvering","doi":"10.47894/mpal.67.6.07","DOIUrl":"https://doi.org/10.47894/mpal.67.6.07","url":null,"abstract":"A look back at the first contributors to this journal.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445858","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}
The Uitpa Formation is a lithostratigraphic unit that crops out in the Guajira peninsula, northeastern Colombia in the Cocinas Basin. This formation consists mainly of marly and argillaceous mudstones of gray to light brown color, intercalated with sandstone and calcarenite beds. The lower contact with de Siamana Formation is unconformable, and at the top the contact with the Jimol Formation is conformable at Uitpa. These units contain an abundant and diverse fauna of planktic and benthic foraminifera that has not been studied in detail yet. In this research, two outcrop sections from the upper Guajira containing the Uitpa Formation were analyzed: the Pisuuluu hill and Jososuwou creek sections. Planktic foraminifera were extracted and taxonomically classified, allowing to assign an age of Chattian (Late Oligocene) (planktic foraminifera biozones O6 - O7). This investigation presents for the first time in Colombia a paleoenvironmental reconstruction integrating various methodologies using quantitative and qualitative analyses in benthic foraminifera. From these analyses an outer neritic to upper bathyal paleodepth was inferred, with environments characterized by high organic matter inputs in eutrophic conditions for both sections. Oxygenation levels were higher in the Pisuuluu hill section, represented by high diversity heterogeneous assemblages, while for the Jososuwou creek section oxygenation was very low producing stressed environments and low diversity homogeneous assemblages.
{"title":"Paleoenvironmental inferences based on benthic foraminifera from the Uitpa Formation (Guajira, Colombia)","authors":"Sofia Barragán Montilla, Alberto Sanchez Quinonez","doi":"10.47894/mpal.67.5.03","DOIUrl":"https://doi.org/10.47894/mpal.67.5.03","url":null,"abstract":"The Uitpa Formation is a lithostratigraphic unit that crops out in the Guajira peninsula, northeastern Colombia in the Cocinas Basin. This formation consists mainly of marly and argillaceous mudstones of gray to light brown color, intercalated with sandstone and calcarenite beds. The lower contact with de Siamana Formation is unconformable, and at the top the contact with the Jimol Formation is conformable at Uitpa. These units contain an abundant and diverse fauna of planktic and benthic foraminifera that has not been studied in detail yet. In this research, two outcrop sections from the upper Guajira containing the Uitpa Formation were analyzed: the Pisuuluu hill and Jososuwou creek sections. Planktic foraminifera were extracted and taxonomically classified, allowing to assign an age of Chattian (Late Oligocene) (planktic foraminifera biozones O6 - O7). This investigation presents for the first time in Colombia a paleoenvironmental reconstruction integrating various methodologies using quantitative and qualitative analyses in benthic foraminifera. From these analyses an outer neritic to upper bathyal paleodepth was inferred, with environments characterized by high organic matter inputs in eutrophic conditions for both sections. Oxygenation levels were higher in the Pisuuluu hill section, represented by high diversity heterogeneous assemblages, while for the Jososuwou creek section oxygenation was very low producing stressed environments and low diversity homogeneous assemblages.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445305","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}
A new assemblage of diverse fish microremains from the Roadian Williams Ranch Member of the Cutoff Formation in the Guadalupe Mountains, West Texas is described. The chondrichthyan remains comprise symmoriiforms Stethacanthulus decorus, Kungurodus sp. and indeterminate taxa; ctenacanthiform Glikmanius myachkovensis; euselachian Sphenacanthus sp. and Hybodontiformes indet.; anachronistids Cooleyella amazonensis, Cooleyella sp. and Reifella lata Ivanov, n. gen., n. sp.; jalodontids Adamantina foliacea, Isacrodus marthae and Isacrodus sp.; indeterminate euchondrocephalian and chondrichthyans. Actinopterygian remains include the elonichthyid Alilepis texasensis Bakaev, n. sp., indeterminate platysomids and acrolepidids, indeterminate taxa and other osteichthyans. The assemblage includes the widely geographically distributed taxa Cooleyella amazonensis, Stethacanthulus decorus and Adamantina foliacea. The occurrence of last two species in the Cutoff Formation represents their youngest record in the world. Possible migration paths are proposed for Alilepis.
描述了德克萨斯州西部瓜达卢佩山脉切断组Roadian Williams牧场成员的各种鱼类微遗骸的新组合。软骨鱼目遗迹包括同形Stethacanthulus decorus, Kungurodus sp.和不确定的分类群;米氏十棘虫;棘棘真棘龙属和下齿形目;时代错误分类:亚马逊Cooleyella, Cooleyella sp.和Reifella lata Ivanov, n.gen, n.sp .;石竹，石竹，石竹;不确定的真软骨鱼和软骨鱼。放线鱼目遗迹包括棘鱼目Alilepis texasensis Bakaev, n. sp，不确定的平鱼目和肢鱼目，不确定的分类群和其他骨鱼目。该组合包括地理分布广泛的分类群Cooleyella amazonensis、Stethacanthulus decorus和Adamantina foliacea。截止组最后两个物种的出现代表了它们在世界上最年轻的记录。对Alilepis提出了可能的迁移路径。
{"title":"Fish Microremains from the Cutoff Formation (Roadian, Middle Permian) of the Guadalupe Mountains, West Texas, USA","authors":"A. Ivanov, A. Bakaev, M. Nestell, G. Nestell","doi":"10.47894/mpal.67.4.03","DOIUrl":"https://doi.org/10.47894/mpal.67.4.03","url":null,"abstract":"A new assemblage of diverse fish microremains from the Roadian Williams Ranch Member of the Cutoff Formation in the Guadalupe Mountains, West Texas is described. The chondrichthyan remains comprise symmoriiforms Stethacanthulus decorus, Kungurodus sp. and indeterminate taxa; ctenacanthiform Glikmanius myachkovensis; euselachian Sphenacanthus sp. and Hybodontiformes indet.; anachronistids Cooleyella amazonensis, Cooleyella sp. and Reifella lata Ivanov, n. gen., n. sp.; jalodontids Adamantina foliacea, Isacrodus marthae and Isacrodus sp.; indeterminate euchondrocephalian and chondrichthyans. Actinopterygian remains include the elonichthyid Alilepis texasensis Bakaev, n. sp., indeterminate platysomids and acrolepidids, indeterminate taxa and other osteichthyans. The assemblage includes the widely geographically distributed taxa Cooleyella amazonensis, Stethacanthulus decorus and Adamantina foliacea. The occurrence of last two species in the Cutoff Formation represents their youngest record in the world. Possible migration paths are proposed for Alilepis.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445535","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}
F. Schlagintweit, K. Rashidi, I. Bucur, Hossain Kohkan, A. Akbari
Based on material from the area of Rafsanjan, Central Iran (P.? iranica Bucur et al.), and southeastern France (type-species P. fragilis Conrad), the genus Pseudoactinoporella Conrad is revisedwith respect to thallusmorphology and suprageneric classification. Reported as possessing a cylindrical or presumably club-shaped thallus, Pseudoactinoporella was assigned to the tribe Salpingoporellinae. In fact, P.? iranica represents a species displaying a capitulum-shaped, stalked thallus whose original description refered to the stalk only. The stalk of P.? iranica shows a spinose aspect due to individualized laterals and is well calcified. The “head†(capitulum) only preserves a thin wall displaying a pattern of cup-like depressions each with a central pore communicating with the fully cemented interior and interpreted as a cortex. P. fragilis is typically presented by trumpet-shaped fragments belonging to the stalk and the transition to the unpreserved (eroded? uncalcified?) “headâ€. For both species, a goniosporate reproduction type (= ampullae disposed laterally along the ramifications) is assumed herein. Due to these characteristics, it appears reasonable to leave apart the generic uncertainty of P. iranica as expressed in the original description. Consequently, Pseudoactinoporella is removed from the Salpingoporellinae and assigned to the family Bornetellaceae and the tribe Bornetelleae.
{"title":"Pseudoactinoporella Conrad 1970 (Family Bornetellaceae) revisited: A Lower Cretaceous corticated and capitulum-shaped, stalked Tethyan Dasycladale","authors":"F. Schlagintweit, K. Rashidi, I. Bucur, Hossain Kohkan, A. Akbari","doi":"10.47894/mpal.67.4.04","DOIUrl":"https://doi.org/10.47894/mpal.67.4.04","url":null,"abstract":"Based on material from the area of Rafsanjan, Central Iran (P.? iranica Bucur et al.), and southeastern France (type-species P. fragilis Conrad), the genus Pseudoactinoporella Conrad is revisedwith respect to thallusmorphology and suprageneric classification. Reported as possessing a cylindrical or presumably club-shaped thallus, Pseudoactinoporella was assigned to the tribe Salpingoporellinae. In fact, P.? iranica represents a species displaying a capitulum-shaped, stalked thallus whose original description refered to the stalk only. The stalk of P.? iranica shows a spinose aspect due to individualized laterals and is well calcified. The “head†(capitulum) only preserves a thin wall displaying a pattern of cup-like depressions each with a central pore communicating with the fully cemented interior and interpreted as a cortex. P. fragilis is typically presented by trumpet-shaped fragments belonging to the stalk and the transition to the unpreserved (eroded? uncalcified?) “headâ€. For both species, a goniosporate reproduction type (= ampullae disposed laterally along the ramifications) is assumed herein. Due to these characteristics, it appears reasonable to leave apart the generic uncertainty of P. iranica as expressed in the original description. Consequently, Pseudoactinoporella is removed from the Salpingoporellinae and assigned to the family Bornetellaceae and the tribe Bornetelleae.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445591","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}
B. Hayward, M. Holzmann, J. Pawłowski, J. H. Parker, Tushar Kaushik, Makoto S. Toyofuku, M. Tsuchiya
Globally, one of the two most common shallow-marine and estuarine foraminiferal genera is Ammonia. Over the past 50 years, the majority of workers have identified specimens in this genus as belonging to just 1-3 cosmopolitan species - A. beccarii, A. tepida and A. parkinsoniana. This has been partly because of the problems of discriminating the Ammonia species based entirely on shell morphology and partly because of a 1974 laboratory study that claimed to have shown that all morphologies were merely ecophenotypic variants of one species - a conclusion that molecular studies have proven to be unequivocally wrong. In this study we recognize, describe and figure sixty-seven living species and infraspecies of Recent Ammonia and two closely-related genera (Acarotrochus, Pseudoeponides) from around the world and summarize their ecological and biogeographic distribution. Twenty-six species and two subspecies are recognized by DNA sequencing and shown to be morphologically distinguishable. A further 39 morphospecies and one subspecies, that have not yet been sequenced, have sufficiently distinct morphology to be recognized. Canonical variates analysis using 42 measured or assessed morphological characters shows that the majority of these species can be readily discriminated by their test morphologies, although a few of the less-ornamented molecular species are verging on being pseudocryptic. Molecular sequencing of the type species of Challengerella (C. bradyi) and Helenina (H. anderseni) places them within our Ammonia clade. Here we continue to recognize the morphologically highly distinct genera Pseudoeponides (subjective senior synonym of Helenina) and allied Acarotrochus. Twenty new species or subspecies are described (molecular T types in brackets): Ammonia abramovichae (T8), A. akitaae, A. aoteana australiensis (T5A), A. arabica (T26), A. ariakensis quiltyi, A. buzasi (T11), A. fajemilai, A. goldsteinae, A. goodayi, A. haigi (T25), A. hattai, A. jorisseni (T23), A. justinparkeri, A. kitazatoi (T10), A. morleyae (T12), A. shchedrinae, A. turgida almogilabinae (T22M), Acarotrochus lippsi, Pseudoeponides hottingeri and P. dubuissoni. Aneotype is designated for A. veneta (Schultze 1854) (T1). We recognize 67 Ammonia and related taxa in this study but speculate that there may be 30 or more additional living species that we are not yet confident to discriminate without molecular sequencing. Ammonia species live in most parts of the world between 62 degrees N (Faeroe Islands) and 55 degrees S (Strait of Magellan), where seasonal sea-surface temperatures are 4-10 degrees C and above. One estuarine species (A. veneta, T1) is cosmopolitan, euryhaline and eurythermic. Several species are widespread in one or two ocean regions (e.g., Atlantic and Mediterranean; South Pacific), whereas the majority are endemic to smaller areas (e.g., eastern Mediterranean; Caribbean-Gulf of Mexico). Eleven biogeographic "provinces" are recognized by cluster analysis of presence
{"title":"Molecular and morphological taxonomy of living Ammonia and related taxa (Foraminifera) and their biogeography","authors":"B. Hayward, M. Holzmann, J. Pawłowski, J. H. Parker, Tushar Kaushik, Makoto S. Toyofuku, M. Tsuchiya","doi":"10.47894/mpal.67.3.01","DOIUrl":"https://doi.org/10.47894/mpal.67.3.01","url":null,"abstract":"Globally, one of the two most common shallow-marine and estuarine foraminiferal genera is Ammonia. Over the past 50 years, the majority of workers have identified specimens in this genus as belonging to just 1-3 cosmopolitan species - A. beccarii, A. tepida and A. parkinsoniana. This has been partly because of the problems of discriminating the Ammonia species based entirely on shell morphology and partly because of a 1974 laboratory study that claimed to have shown that all morphologies were merely ecophenotypic variants of one species - a conclusion that molecular studies have proven to be unequivocally wrong. In this study we recognize, describe and figure sixty-seven living species and infraspecies of Recent Ammonia and two closely-related genera (Acarotrochus, Pseudoeponides) from around the world and summarize their ecological and biogeographic distribution. Twenty-six species and two subspecies are recognized by DNA sequencing and shown to be morphologically distinguishable. A further 39 morphospecies and one subspecies, that have not yet been sequenced, have sufficiently distinct morphology to be recognized. Canonical variates analysis using 42 measured or assessed morphological characters shows that the majority of these species can be readily discriminated by their test morphologies, although a few of the less-ornamented molecular species are verging on being pseudocryptic. Molecular sequencing of the type species of Challengerella (C. bradyi) and Helenina (H. anderseni) places them within our Ammonia clade. Here we continue to recognize the morphologically highly distinct genera Pseudoeponides (subjective senior synonym of Helenina) and allied Acarotrochus. Twenty new species or subspecies are described (molecular T types in brackets): Ammonia abramovichae (T8), A. akitaae, A. aoteana australiensis (T5A), A. arabica (T26), A. ariakensis quiltyi, A. buzasi (T11), A. fajemilai, A. goldsteinae, A. goodayi, A. haigi (T25), A. hattai, A. jorisseni (T23), A. justinparkeri, A. kitazatoi (T10), A. morleyae (T12), A. shchedrinae, A. turgida almogilabinae (T22M), Acarotrochus lippsi, Pseudoeponides hottingeri and P. dubuissoni. Aneotype is designated for A. veneta (Schultze 1854) (T1). We recognize 67 Ammonia and related taxa in this study but speculate that there may be 30 or more additional living species that we are not yet confident to discriminate without molecular sequencing. Ammonia species live in most parts of the world between 62 degrees N (Faeroe Islands) and 55 degrees S (Strait of Magellan), where seasonal sea-surface temperatures are 4-10 degrees C and above. One estuarine species (A. veneta, T1) is cosmopolitan, euryhaline and eurythermic. Several species are widespread in one or two ocean regions (e.g., Atlantic and Mediterranean; South Pacific), whereas the majority are endemic to smaller areas (e.g., eastern Mediterranean; Caribbean-Gulf of Mexico). Eleven biogeographic \"provinces\" are recognized by cluster analysis of presence","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445365","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}
M. Kaminski, L. Alegret, S. Hikmahtiar, A. Waśkowska
Deep-water agglutinated Foraminifera (DWAF) are investigated from Paleocene sediments recovered from IODP Hole U1511B in the northeastern Tasman Sea. The recovered foraminifera display exceptional three-dimensional preservation: they are relatively unaltered by sediment diagenesis and compaction.We examined 27 samples fromCores U1511B-45R to -47R, and recovered over 70 species of DWAF. The assemblage consists entirely of “cosmopolitan†forms originally described from the Carpathians, Caucasus, Trinidad, and the western Tethys, implying that there is no provinciality among DWAF faunas in the world ocean.
{"title":"The Paleocene of IODP Site U1511, Tasman Sea: A lagerstatte deposit for deep-water agglutinated foraminifera","authors":"M. Kaminski, L. Alegret, S. Hikmahtiar, A. Waśkowska","doi":"10.47894/mpal.67.4.02","DOIUrl":"https://doi.org/10.47894/mpal.67.4.02","url":null,"abstract":"Deep-water agglutinated Foraminifera (DWAF) are investigated from Paleocene sediments recovered from IODP Hole U1511B in the northeastern Tasman Sea. The recovered foraminifera display exceptional three-dimensional preservation: they are relatively unaltered by sediment diagenesis and compaction.We examined 27 samples fromCores U1511B-45R to -47R, and recovered over 70 species of DWAF. The assemblage consists entirely of “cosmopolitan†forms originally described from the Carpathians, Caucasus, Trinidad, and the western Tethys, implying that there is no provinciality among DWAF faunas in the world ocean.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445477","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}
The Karakaya Complex in northern Turkey is classically subdivided into two units (Upper and Lower Karakaya Complex) and located in the Sakarya Composite Terrane. The Upper Karakaya Complex includes different blocks and tectonic slices within a Triassic matrix. A new genus of miliolid foraminifera (Cornuspiroidea, Neodiscidae) is established from the late Capitanian (latest Guadalupian) neritic limestone block from the Upper Karakaya Complex. The new genus Globidiscus is characterized by a large, inflated lenticular in the axial and subglobular in transverse section and involute test with well-developed flosculinisation and a porcelaneous wall with buttresses. It was probably derived from the Praeneodiscus-Neodiscus lineage in late Capitanian (Guadalupian).
{"title":"Globidiscus n. gen. (Foraminifera, Neodiscidae): A new Late Guadalupian genus from the Karakaya Complex, Northwest Anatolia (Turkey)","authors":"C. Okuyucu","doi":"10.47894/mpal.67.6.02","DOIUrl":"https://doi.org/10.47894/mpal.67.6.02","url":null,"abstract":"The Karakaya Complex in northern Turkey is classically subdivided into two units (Upper and Lower Karakaya Complex) and located in the Sakarya Composite Terrane. The Upper Karakaya Complex includes different blocks and tectonic slices within a Triassic matrix. A new genus of miliolid foraminifera (Cornuspiroidea, Neodiscidae) is established from the late Capitanian (latest Guadalupian) neritic limestone block from the Upper Karakaya Complex. The new genus Globidiscus is characterized by a large, inflated lenticular in the axial and subglobular in transverse section and involute test with well-developed flosculinisation and a porcelaneous wall with buttresses. It was probably derived from the Praeneodiscus-Neodiscus lineage in late Capitanian (Guadalupian).","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445695","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}
The SE Caribbean Sea is not ubiquitously oligotrophic. It is subject to the Caribbean Current, which is an extension of the Guiana Current and flows NW across the sea. It is also impacted by outflow from the Orinoco River, which produces a hypopycnal plume that is transported across the sea by the Caribbean Current, and by local upwelling, which occurs at distinct focuses. This paper uses non-metric multidimensional scaling (NMDS) to examine the impact of this oceanographic complexity on the distributions, based on species presence/absence, of neritic to upper bathyal benthic foraminifera. Sites within the ambit of the Orinoco Plume (Orinoco offshore, Trinidad East Coast Marine Area [ECMA], Trinidad North Coast Marine Area [NCMA), offshore NW Tobago, Bequia) are closely grouped by NMDS, despite the NCMA being subject to minor upwelling and Bequia only seasonally laying within the plume. The Paria and Araya Peninsula areas, though geographically close and both subject to upwelling, do not cluster closely. This indicates that the two upwelling focuses induced some biogeographic separation. The Isla La Tortuga, being bathed with oligotrophic water, plotted far from the eutrophic Orinoco Plume sites. The upwelling Paria Peninsula site, adjacent to the Orinoco Plume, yielded seventeen species of Bolivina (the greatest species richness for this genus of any of our sites), whereas Isla La Tortuga yielded only four. The Trinidad NCMA, likewise a site of upwelling, presented the second highest number of species of Bolivina, yielding twelve. That the Plataforma Deltana site plotted far from all others reflects its bathyal position beyond the Orinoco Plume.
东加勒比海并不是到处都是营养不良的。它受加勒比海洋流的影响，加勒比海洋流是圭亚那洋流的延伸，向西北方向流过海洋。它还受到奥里诺科河流出的影响，奥里诺科河产生的低气压羽流被加勒比海洋流带过海洋，以及当地的上升流，这发生在不同的焦点。本文采用非度量多维尺度(NMDS)研究了这种海洋复杂性对浅海到深海底栖有孔虫分布的影响，基于物种存在/缺失。奥里诺科河羽流范围内的地点(奥里诺科河近海，特立尼达东海岸海域[ECMA]，特立尼达北岸海域[NCMA]，多巴哥西北部近海，Bequia)被NMDS紧密地聚集在一起，尽管NCMA受到轻微上升流的影响，Bequia只是季节性地位于羽流范围内。帕里亚和阿拉亚半岛地区，虽然地理上很近，都受到上升流的影响，但并没有紧密地聚集在一起。这表明两个上升流焦点引起了一定的生物地理分离。托尔图加岛(Isla La Tortuga)沐浴在富营养化的水中，远离富营养化的奥里诺科河羽流(Orinoco Plume)。在与奥里诺科河羽(Orinoco Plume)相邻的帕里亚半岛(Paria Peninsula)上涌遗址，发现了17种波利维纳(Bolivina)，这是该属物种最丰富的遗址，而托尔图加岛(Isla La Tortuga)只发现了4种。特立尼达NCMA，同样是上升流的地方，出现了玻利维亚物种数量第二高的地方，有12种。德尔塔平台的位置远高于其他所有地点，这反映了它在奥里诺科河柱之外的深海位置。
{"title":"Benthic foraminiferal biogeography in the southeast Caribbean Sea","authors":"B. Wilson, H. Carvajal-Chitty","doi":"10.47894/mpal.67.1.02","DOIUrl":"https://doi.org/10.47894/mpal.67.1.02","url":null,"abstract":"The SE Caribbean Sea is not ubiquitously oligotrophic. It is subject to the Caribbean Current, which is an extension of the Guiana Current and flows NW across the sea. It is also impacted by outflow from the Orinoco River, which produces a hypopycnal plume that is transported across the sea by the Caribbean Current, and by local upwelling, which occurs at distinct focuses. This paper uses non-metric multidimensional scaling (NMDS) to examine the impact of this oceanographic complexity on the distributions, based on species presence/absence, of neritic to upper bathyal benthic foraminifera. Sites within the ambit of the Orinoco Plume (Orinoco offshore, Trinidad East Coast Marine Area [ECMA], Trinidad North Coast Marine Area [NCMA), offshore NW Tobago, Bequia) are closely grouped by NMDS, despite the NCMA being subject to minor upwelling and Bequia only seasonally laying within the plume. The Paria and Araya Peninsula areas, though geographically close and both subject to upwelling, do not cluster closely. This indicates that the two upwelling focuses induced some biogeographic separation. The Isla La Tortuga, being bathed with oligotrophic water, plotted far from the eutrophic Orinoco Plume sites. The upwelling Paria Peninsula site, adjacent to the Orinoco Plume, yielded seventeen species of Bolivina (the greatest species richness for this genus of any of our sites), whereas Isla La Tortuga yielded only four. The Trinidad NCMA, likewise a site of upwelling, presented the second highest number of species of Bolivina, yielding twelve. That the Plataforma Deltana site plotted far from all others reflects its bathyal position beyond the Orinoco Plume.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70444718","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}
Robert D. Liska passed away on January 24, 2021. He died peacefully at home in the presence of his much-loved wife of 64 years. Born in 1931, Bob earned his MSc in Geology at San Diego State University. In 1963 Bob joined Texaco in Long Beach, California as a geologist. Two years later he joined Texaco International in Colombia, and in 1973 moved to Trinidad. Bob had a long association with Micropaleontology Press, and published several papers in Micropaleontology and in the Journal of Foraminiferal Research in the 1980’s and 1990’s. Bob leaves behind the legacy of his lifelong passion for micropaleontology and stratigraphy: his extensive and unique microfossil collection which will be housed at University College London, and his equipment which was donated to Texas A&M.
{"title":"A memorial to Robert D. Liska (1931-2021)","authors":"W. Berggren","doi":"10.47894/mpal.67.4.06","DOIUrl":"https://doi.org/10.47894/mpal.67.4.06","url":null,"abstract":"Robert D. Liska passed away on January 24, 2021. He died peacefully at home in the presence of his much-loved wife of 64 years. Born in 1931, Bob earned his MSc in Geology at San Diego State University. In 1963 Bob joined Texaco in Long Beach, California as a geologist. Two years later he joined Texaco International in Colombia, and in 1973 moved to Trinidad. Bob had a long association with Micropaleontology Press, and published several papers in Micropaleontology and in the Journal of Foraminiferal Research in the 1980’s and 1990’s. Bob leaves behind the legacy of his lifelong passion for micropaleontology and stratigraphy: his extensive and unique microfossil collection which will be housed at University College London, and his equipment which was donated to Texas A&M.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445347","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}
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