Pub Date : 2022-08-31DOI: 10.1080/01916122.2022.2119293
Jaquelini Luber, T. Carrijo, Mauricio Moreira Martins, Cláudia Barbieri Ferreira Mendonça, V. Gonçalves-Esteves
ABSTRACT Campomanesia is a well-delimited Neotropical genus of Myrtaceae, but some of its species have a poorly understood circumscription. Pollen morphology can provide characters to clarify the relationships among such taxa. Here, we analyze the pollen grains of 16 species of Campomanesia using light and scanning electron microscopy. Heat map and multivariate regression tree analyses were performed aiming to detect differences among species based on pollen morphology. Pollen grains of the studied taxa are isopolar monads that are oblate or, less often, suboblate, 3(4)-colporate, syncolporate or parasyncolporate, with a triangular or quandrangular amb. The exine ornamentation varies among rugulate-granulate, granulate, rugulate and rugulate-espiculate. Fastigium is present in 14 species, and a costa is present in three species. The heat map and regression tree analyses based on 16 character states of pollen morphology were able to distinguish all species of Campomanesia studied here. Some species differ from all the other species, such as Campomanesia guaviroba due to its exclusively rugulate exine. Amb, shape and exine ornamentation were distinctive characters, as previously reported for other genera of Myrtaceae. However, the presence of fastigium also proved to be an informative pollen character for species distinction in Campomanesia. Based on the sample of this study, we can state that Campomanesia is a eurypalynous genus within Myrtaceae.
{"title":"Pollen Morphology: A Source of Information for Taxonomic Studies within Campomanesia (Myrtaceae)","authors":"Jaquelini Luber, T. Carrijo, Mauricio Moreira Martins, Cláudia Barbieri Ferreira Mendonça, V. Gonçalves-Esteves","doi":"10.1080/01916122.2022.2119293","DOIUrl":"https://doi.org/10.1080/01916122.2022.2119293","url":null,"abstract":"ABSTRACT Campomanesia is a well-delimited Neotropical genus of Myrtaceae, but some of its species have a poorly understood circumscription. Pollen morphology can provide characters to clarify the relationships among such taxa. Here, we analyze the pollen grains of 16 species of Campomanesia using light and scanning electron microscopy. Heat map and multivariate regression tree analyses were performed aiming to detect differences among species based on pollen morphology. Pollen grains of the studied taxa are isopolar monads that are oblate or, less often, suboblate, 3(4)-colporate, syncolporate or parasyncolporate, with a triangular or quandrangular amb. The exine ornamentation varies among rugulate-granulate, granulate, rugulate and rugulate-espiculate. Fastigium is present in 14 species, and a costa is present in three species. The heat map and regression tree analyses based on 16 character states of pollen morphology were able to distinguish all species of Campomanesia studied here. Some species differ from all the other species, such as Campomanesia guaviroba due to its exclusively rugulate exine. Amb, shape and exine ornamentation were distinctive characters, as previously reported for other genera of Myrtaceae. However, the presence of fastigium also proved to be an informative pollen character for species distinction in Campomanesia. Based on the sample of this study, we can state that Campomanesia is a eurypalynous genus within Myrtaceae.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 13"},"PeriodicalIF":1.5,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48087113","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}
Pub Date : 2022-08-24DOI: 10.1080/01916122.2022.2116498
A. Soliman, W. Piller, K. Dybkjær, H. Slimani, G. Auer
ABSTRACT Middle Miocene (Serravallian; upper Badenian–lower Sarmatian) strata recovered in 10 cored boreholes (83 samples) from Bad Deutsch-Altenburg, Vienna Basin, Austria, were analysed palynologically for the first time. The strata belong to the Rabensburg Formation of the Baden Group. The lateral distribution of the boreholes in reference to a Mesozoic ridge makes this area interesting for studying various aspects such as distribution of deposits, stratigraphy and palaeoenvironmental reconstruction. A diverse and well-preserved in situ dinoflagellate cyst association has been identified. Middle Miocene age-diagnostic species including Cannosphaeropsis passio, Cerebrocysta poulsenii, Habibacysta tectata, Labyrinthodinium truncatum, Operculodinium? borgerholtense and Unipontidinium aquaeductum are recorded. Their occurrences allow correlation with dinoflagellate cyst biozonations on a regional scale. Based on the identified dinoflagellate cysts and by correlation with calcareous nannoplankton and ostracods, from the same set of samples, a Serravallian age – corresponding to a late Badenian and early Sarmatian age (regional Paratethys stages) – is confirmed. Reworked (Cretaceous and Paleogene) dinoflagellate cyst assemblages, also well preserved, were recorded abundantly from boreholes HA 521 and HA 573 (south-west of the Mesozoic ridge). In accordance with ostracods, the Badenian–Sarmatian boundary can be traced in the upper part of borehole HA 66 based on an abrupt change in the dinoflagellate cyst assemblages. The upper Badenian strata were deposited in a coastal to inner shelf environment with terrigenous (siliceous sand and clay) and carbonate sediments. The recorded dinoflagellate cysts reflect marine, tropical to warm-temperate climatic conditions. The composition of the recorded dinoflagellate cyst assemblages is very close to that of the Middle Miocene assemblages of the Mediterranean, indicating water exchanges between the Central Paratethys and the Mediterranean during the late Badenian (early Serravallian).
{"title":"Middle Miocene (Serravallian; Upper Badenian–Lower Sarmatian) Dinoflagellate Cysts from Bad Deutsch-Altenburg, Vienna Basin, Austria","authors":"A. Soliman, W. Piller, K. Dybkjær, H. Slimani, G. Auer","doi":"10.1080/01916122.2022.2116498","DOIUrl":"https://doi.org/10.1080/01916122.2022.2116498","url":null,"abstract":"ABSTRACT Middle Miocene (Serravallian; upper Badenian–lower Sarmatian) strata recovered in 10 cored boreholes (83 samples) from Bad Deutsch-Altenburg, Vienna Basin, Austria, were analysed palynologically for the first time. The strata belong to the Rabensburg Formation of the Baden Group. The lateral distribution of the boreholes in reference to a Mesozoic ridge makes this area interesting for studying various aspects such as distribution of deposits, stratigraphy and palaeoenvironmental reconstruction. A diverse and well-preserved in situ dinoflagellate cyst association has been identified. Middle Miocene age-diagnostic species including Cannosphaeropsis passio, Cerebrocysta poulsenii, Habibacysta tectata, Labyrinthodinium truncatum, Operculodinium? borgerholtense and Unipontidinium aquaeductum are recorded. Their occurrences allow correlation with dinoflagellate cyst biozonations on a regional scale. Based on the identified dinoflagellate cysts and by correlation with calcareous nannoplankton and ostracods, from the same set of samples, a Serravallian age – corresponding to a late Badenian and early Sarmatian age (regional Paratethys stages) – is confirmed. Reworked (Cretaceous and Paleogene) dinoflagellate cyst assemblages, also well preserved, were recorded abundantly from boreholes HA 521 and HA 573 (south-west of the Mesozoic ridge). In accordance with ostracods, the Badenian–Sarmatian boundary can be traced in the upper part of borehole HA 66 based on an abrupt change in the dinoflagellate cyst assemblages. The upper Badenian strata were deposited in a coastal to inner shelf environment with terrigenous (siliceous sand and clay) and carbonate sediments. The recorded dinoflagellate cysts reflect marine, tropical to warm-temperate climatic conditions. The composition of the recorded dinoflagellate cyst assemblages is very close to that of the Middle Miocene assemblages of the Mediterranean, indicating water exchanges between the Central Paratethys and the Mediterranean during the late Badenian (early Serravallian).","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 26"},"PeriodicalIF":1.5,"publicationDate":"2022-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45643484","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}
Pub Date : 2022-08-23DOI: 10.1080/01916122.2022.2115574
Vojtěch Kovář, O. Fatka, J. Vodička
ABSTRACT Monogeneric clusters of five acritarch genera (Adara, Cymatiosphaera, Eliasum, Synsphaeridium and Timofeevia) were discovered in palynological residues obtained from fine-grained siliciclastic samples from the middle Cambrian (Miaolingian) Jince Formation of the Příbram–Jince Basin (Czech Republic). The clusters consist of two to more than 100 individual specimens and lack a common pattern of organisation. Acritarchs within clusters fall within a similar size range, regardless of generic affinity. Proposed mechanisms for the formation of these acritarch clusters are discussed: for the Jince Formation clusters, aggregation within algal blooms or primary colonial behaviour are the most plausible explanations. In addition, a summary of reports of acritarch clusters from lower Palaeozoic strata is included: clusters of a variety of acritarch genera have been documented from rocks of early Cambrian to Late Devonian age.
{"title":"Acritarch Clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic","authors":"Vojtěch Kovář, O. Fatka, J. Vodička","doi":"10.1080/01916122.2022.2115574","DOIUrl":"https://doi.org/10.1080/01916122.2022.2115574","url":null,"abstract":"ABSTRACT Monogeneric clusters of five acritarch genera (Adara, Cymatiosphaera, Eliasum, Synsphaeridium and Timofeevia) were discovered in palynological residues obtained from fine-grained siliciclastic samples from the middle Cambrian (Miaolingian) Jince Formation of the Příbram–Jince Basin (Czech Republic). The clusters consist of two to more than 100 individual specimens and lack a common pattern of organisation. Acritarchs within clusters fall within a similar size range, regardless of generic affinity. Proposed mechanisms for the formation of these acritarch clusters are discussed: for the Jince Formation clusters, aggregation within algal blooms or primary colonial behaviour are the most plausible explanations. In addition, a summary of reports of acritarch clusters from lower Palaeozoic strata is included: clusters of a variety of acritarch genera have been documented from rocks of early Cambrian to Late Devonian age.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 18"},"PeriodicalIF":1.5,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44947881","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}
Pub Date : 2022-08-19DOI: 10.1080/01916122.2022.2115159
Vera A. Korasidis, S. Wing, G. Harrington, T. Demchuk, Julia Gravendyck, P. Jardine, D. Willard
ABSTRACT Pollen and spores were recovered from the Paleocene Fort Union Formation and Paleocene–Eocene Willwood Formation of the Bighorn Basin (BHB), northwestern Wyoming, USA. In many local stratigraphic sections in the BHB, the base of the Eocene has been identified by the characteristic negative carbon isotope excursion (CIE) that marks the beginning of the Paleocene–Eocene Thermal Maximum (PETM). The palynotaxa from outcrop samples were examined using light microscopy (LM) and scanning electron microscopy (SEM). Seven new species are formally described (Tricolpites vegrandis, Rousea spatium, Striatricolporites astutus, Striatopollis calidarius, Friedrichipollis geminus, Retistephanocolporites modicrassus and Retistephanocolporites pergrandis). The temporal and geographic distributions of many of these palynotaxa suggest that hotter and more seasonally dry climates facilitated their northward range shifts during the PETM from the tropics or subtropics of the USA. For the temperate palynotaxa, the hotter and seasonally dry conditions resulted in local extirpation. A reevaluation of the palynostratigraphic schemes established for the Paleocene–Eocene boundary confirms that the first appearance of Platycarya platycaryoides denotes the Paleocene–Eocene boundary in the Rocky Mountains region. A new Striatopollis calidarius Subzone, associated with early Wasatchian (Wa) Wa-0 and Wa-R faunas, is also recognized for CIE body localities in the BHB.
{"title":"Biostratigraphically Significant Palynofloras from the Paleocene–Eocene Boundary of the USA","authors":"Vera A. Korasidis, S. Wing, G. Harrington, T. Demchuk, Julia Gravendyck, P. Jardine, D. Willard","doi":"10.1080/01916122.2022.2115159","DOIUrl":"https://doi.org/10.1080/01916122.2022.2115159","url":null,"abstract":"ABSTRACT Pollen and spores were recovered from the Paleocene Fort Union Formation and Paleocene–Eocene Willwood Formation of the Bighorn Basin (BHB), northwestern Wyoming, USA. In many local stratigraphic sections in the BHB, the base of the Eocene has been identified by the characteristic negative carbon isotope excursion (CIE) that marks the beginning of the Paleocene–Eocene Thermal Maximum (PETM). The palynotaxa from outcrop samples were examined using light microscopy (LM) and scanning electron microscopy (SEM). Seven new species are formally described (Tricolpites vegrandis, Rousea spatium, Striatricolporites astutus, Striatopollis calidarius, Friedrichipollis geminus, Retistephanocolporites modicrassus and Retistephanocolporites pergrandis). The temporal and geographic distributions of many of these palynotaxa suggest that hotter and more seasonally dry climates facilitated their northward range shifts during the PETM from the tropics or subtropics of the USA. For the temperate palynotaxa, the hotter and seasonally dry conditions resulted in local extirpation. A reevaluation of the palynostratigraphic schemes established for the Paleocene–Eocene boundary confirms that the first appearance of Platycarya platycaryoides denotes the Paleocene–Eocene boundary in the Rocky Mountains region. A new Striatopollis calidarius Subzone, associated with early Wasatchian (Wa) Wa-0 and Wa-R faunas, is also recognized for CIE body localities in the BHB.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 20"},"PeriodicalIF":1.5,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59286930","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}
Pub Date : 2022-07-26DOI: 10.1080/01916122.2022.2106322
M. Gottschling, M. Elbrächter, U. Tillmann
Abstract Micracanthodinium setiferum is a very distinctive but poorly known dinophyte with characteristically delicate, unbranched, filiform and pointed setae. A recent study by Mertens et al. (2022, Palynology 46: 1934908) aims to clarify the taxonomy of the species and to introduce two new formae acknowledging the presence or absence of setae in environmentally collected cells. We assert that the epitype choice of illustrations by these authors is inappropriate, but also not achieved following the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN). Additionally, the two new formae are not described in accordance with the rules of the ICN. A more suitable epitype may therefore be chosen, once corresponding physical material from the type locality off Sicily is at hand. The taxonomic identity of M. setiferum meanwhile remains elusive.
{"title":"Comments on Mertens et al. (2022): the taxonomic identity of Micracanthodinium setiferum (Lohmann) Deflandre (Dinophyceae incertae sedis) remains elusive, and its epitypification is not achieved","authors":"M. Gottschling, M. Elbrächter, U. Tillmann","doi":"10.1080/01916122.2022.2106322","DOIUrl":"https://doi.org/10.1080/01916122.2022.2106322","url":null,"abstract":"Abstract Micracanthodinium setiferum is a very distinctive but poorly known dinophyte with characteristically delicate, unbranched, filiform and pointed setae. A recent study by Mertens et al. (2022, Palynology 46: 1934908) aims to clarify the taxonomy of the species and to introduce two new formae acknowledging the presence or absence of setae in environmentally collected cells. We assert that the epitype choice of illustrations by these authors is inappropriate, but also not achieved following the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN). Additionally, the two new formae are not described in accordance with the rules of the ICN. A more suitable epitype may therefore be chosen, once corresponding physical material from the type locality off Sicily is at hand. The taxonomic identity of M. setiferum meanwhile remains elusive.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"46 1","pages":"1 - 3"},"PeriodicalIF":1.5,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42800711","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}
Pub Date : 2022-07-21DOI: 10.1080/01916122.2022.2103748
Cristina Renee Salgado Laurenti, M. C. Tellería, J. M. Coronel, S. Sobrado
ABSTRACT This article is the first contribution to the characterization of monofloral honeys from the Dry and Humid Chaco that combines palynological and physicochemical parameters. The study focuses on the most represented honeys. Physicochemical parameters such as color, electrical conductivity, moisture, acidity and pH were analyzed for a total of 116 honeys classified as monofloral by pollen analysis. All the parameters considered were within the accepted range. Color and electrical conductivity were the most distinctive features, as stressed by multivariate (cluster analysis (CA) and principal component analysis (PCA)) and correlation analysis. The darkest honeys (i.e. black, dark amber and amber) were those from Tessaria integrifolia, Schinopsis balansae, S. lorentzii and Baccharis–Eupatorium-type pollen, and the lightest honeys (i.e. light amber and extra light amber) were those from Cynophalla retusa, Eugenia uniflora, Copernicia alba, Prosopis alba and Helianthus annuus. Mean values for electrical conductivity ranged from 0.4 to 0.8mS cm–1, with the highest values detected in the darkest honeys, which are mainly produced in the Dry Chaco. The intense color of these honeys also suggests the presence of antioxidants. Thus, the color, electrical conductivity and antioxidant properties are important factors for future research to consider, to obtain a reliable authentication of the botanical and geographical features of these honeys.
{"title":"An Overview of the Palynology and Physicochemistry of Monofloral Honeys from the Dry and Humid Chaco of Argentina","authors":"Cristina Renee Salgado Laurenti, M. C. Tellería, J. M. Coronel, S. Sobrado","doi":"10.1080/01916122.2022.2103748","DOIUrl":"https://doi.org/10.1080/01916122.2022.2103748","url":null,"abstract":"ABSTRACT This article is the first contribution to the characterization of monofloral honeys from the Dry and Humid Chaco that combines palynological and physicochemical parameters. The study focuses on the most represented honeys. Physicochemical parameters such as color, electrical conductivity, moisture, acidity and pH were analyzed for a total of 116 honeys classified as monofloral by pollen analysis. All the parameters considered were within the accepted range. Color and electrical conductivity were the most distinctive features, as stressed by multivariate (cluster analysis (CA) and principal component analysis (PCA)) and correlation analysis. The darkest honeys (i.e. black, dark amber and amber) were those from Tessaria integrifolia, Schinopsis balansae, S. lorentzii and Baccharis–Eupatorium-type pollen, and the lightest honeys (i.e. light amber and extra light amber) were those from Cynophalla retusa, Eugenia uniflora, Copernicia alba, Prosopis alba and Helianthus annuus. Mean values for electrical conductivity ranged from 0.4 to 0.8mS cm–1, with the highest values detected in the darkest honeys, which are mainly produced in the Dry Chaco. The intense color of these honeys also suggests the presence of antioxidants. Thus, the color, electrical conductivity and antioxidant properties are important factors for future research to consider, to obtain a reliable authentication of the botanical and geographical features of these honeys.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 10"},"PeriodicalIF":1.5,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47553097","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}
Pub Date : 2022-07-19DOI: 10.1080/01916122.2022.2103196
K. Berry
Abstract The Cretaceous/Paleogene (K/Pg) boundary fern-spore spike concept was first introduced by R.H. Tschudy 40 years ago and established the precept that ferns are so-called ‘disaster taxa’ that flourish after natural disasters because of the high colonization potential of their wind-blown spores. Among the least understood topics at the crux of contemporary K/Pg boundary fern-spike studies is whether Stenochlaena-like or other stem blechnaceous ferns were among those that flourished after the K/Pg event, contributing to the Laevigatosporites-dominated phase of the fern-spore spike. For instance, dispersed Stenochlaena-like spores – e.g. Polypodiisporites usmensis (van der Hammen) Khan & Martin – first appear in the upper Eocene stratigraphic record of South America, whereas megafossils of Stenochlaena-like ferns are first known from the upper Paleocene strata of this same region. Beyond this traditional focus on taphonomic and taxonomic uncertainty regarding the identity of dispersed spore producers, however, there is further discordance between contemporary paleobotanical and molecular phylogenetic perspectives on the timing of diversification of stem lineages of blechnaceous ferns in relation to the K/Pg boundary. This investigation reconciles these two perspectives by constraining molecular clock divergence time estimates using contemporary fossil data. If this reconciliation is correct, then paleopolyploidization (whole genome duplication or WGD) associated with the origin of the genus Stenochlaena J. Sm. predated evolution of polocytic stomata, a heavily ornamented exospore, and a hemi-epiphytic to epiphytic habit observed in the crown lineage. Critically, this novel perspective elicits a merger of the K/Pg boundary fern spike and K/Pg boundary-WGD concepts, suggesting a link between polyploidy and the ‘disaster taxon’ concept.
{"title":"Revisiting R.H. Tschudy’s fern-spore spike concept 40 years later: connecting Tschudy’s ‘disaster taxon’ concept with paleopolyploidization in Stenochlaena J. Sm","authors":"K. Berry","doi":"10.1080/01916122.2022.2103196","DOIUrl":"https://doi.org/10.1080/01916122.2022.2103196","url":null,"abstract":"Abstract The Cretaceous/Paleogene (K/Pg) boundary fern-spore spike concept was first introduced by R.H. Tschudy 40 years ago and established the precept that ferns are so-called ‘disaster taxa’ that flourish after natural disasters because of the high colonization potential of their wind-blown spores. Among the least understood topics at the crux of contemporary K/Pg boundary fern-spike studies is whether Stenochlaena-like or other stem blechnaceous ferns were among those that flourished after the K/Pg event, contributing to the Laevigatosporites-dominated phase of the fern-spore spike. For instance, dispersed Stenochlaena-like spores – e.g. Polypodiisporites usmensis (van der Hammen) Khan & Martin – first appear in the upper Eocene stratigraphic record of South America, whereas megafossils of Stenochlaena-like ferns are first known from the upper Paleocene strata of this same region. Beyond this traditional focus on taphonomic and taxonomic uncertainty regarding the identity of dispersed spore producers, however, there is further discordance between contemporary paleobotanical and molecular phylogenetic perspectives on the timing of diversification of stem lineages of blechnaceous ferns in relation to the K/Pg boundary. This investigation reconciles these two perspectives by constraining molecular clock divergence time estimates using contemporary fossil data. If this reconciliation is correct, then paleopolyploidization (whole genome duplication or WGD) associated with the origin of the genus Stenochlaena J. Sm. predated evolution of polocytic stomata, a heavily ornamented exospore, and a hemi-epiphytic to epiphytic habit observed in the crown lineage. Critically, this novel perspective elicits a merger of the K/Pg boundary fern spike and K/Pg boundary-WGD concepts, suggesting a link between polyploidy and the ‘disaster taxon’ concept.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"46 1","pages":"1 - 11"},"PeriodicalIF":1.5,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45859400","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}
Pub Date : 2022-07-05DOI: 10.1080/01916122.2022.2097329
S. N. Césari, C. Limarino, Patricia L. Ciccioli, C. Wall
ABSTRACT The upper Palaeozoic basins of central-western Argentina include continuous fossiliferous successions spanning the Carboniferous-Permian interval. The palynostratigraphic biozones comprise Late Mississippian, Pennsylvanian and Cisuralian assemblages. Recently, new palynofloras of the La Veteada Formation were referred to the Lopingian (late Permian). However, they are characterized by spores and tetrads of Lundbladispora spp. and Densoisporites spp., pollen grains of Lunatisporites pellucidus, L. noviaulensis and Protohaploxypinus samoilovichii, and the alga Syndesmorion stellatum, that distinguish the post-Permian recovery floras worldwide. A new uranium-lead chemical abrasion-isotope dilution-thermal ionization mass spectrometry (U-Pb CA-ID-TIMS) age confirms the Olenekian age of this stratigraphic unit and allows the identification of the first Early Triassic palynofloras in this region of western Gondwana. Comparison and correlation with similar assemblages from the southern and northern hemispheres supports the Early Triassic turnover with an increase of lycopsid cavate spores associated with some diagnostic species of taeniate and non-taeniate bisaccate pollen.
{"title":"Age Constraints of the Guttulapollenites hannonicus –Cladaitina veteadensis Biozone in Argentina Reveal the First Record of Early Triassic (Olenekian) Palynofloras in Western Gondwana","authors":"S. N. Césari, C. Limarino, Patricia L. Ciccioli, C. Wall","doi":"10.1080/01916122.2022.2097329","DOIUrl":"https://doi.org/10.1080/01916122.2022.2097329","url":null,"abstract":"ABSTRACT The upper Palaeozoic basins of central-western Argentina include continuous fossiliferous successions spanning the Carboniferous-Permian interval. The palynostratigraphic biozones comprise Late Mississippian, Pennsylvanian and Cisuralian assemblages. Recently, new palynofloras of the La Veteada Formation were referred to the Lopingian (late Permian). However, they are characterized by spores and tetrads of Lundbladispora spp. and Densoisporites spp., pollen grains of Lunatisporites pellucidus, L. noviaulensis and Protohaploxypinus samoilovichii, and the alga Syndesmorion stellatum, that distinguish the post-Permian recovery floras worldwide. A new uranium-lead chemical abrasion-isotope dilution-thermal ionization mass spectrometry (U-Pb CA-ID-TIMS) age confirms the Olenekian age of this stratigraphic unit and allows the identification of the first Early Triassic palynofloras in this region of western Gondwana. Comparison and correlation with similar assemblages from the southern and northern hemispheres supports the Early Triassic turnover with an increase of lycopsid cavate spores associated with some diagnostic species of taeniate and non-taeniate bisaccate pollen.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":"47 1","pages":"1 - 20"},"PeriodicalIF":1.5,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46187072","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}
Pub Date : 2022-06-27DOI: 10.1080/01916122.2022.2095053
M. Kurşat, Neriman Özdağ, B. Başer, FAHRETTİN ÖZBEY, I. Emre
Abstract Ranunculus L. (Ranunculaceae) is morphologically very diverse and palynological characters support the systematic studies of the genus. This study was aimed to perform palynological investigations of 30 different taxa of Ranunculus by using light microscope (LM) and scanning electron microscopy (SEM) methods. Polar-equatorial axis measurements, exine-intine layer thicknesses and colpi-pori numbers of pollen grains were examined using the Wodehouse method. Surface ornamentations were determined by electron microscope. The dendrogram of palynological characters analysed on the LM and SEM and observations made by multi-variate statistical package software partly support the monophyletic genera. According to the palynological dendrogram, Ranunculus taxa are divided into three types and R. arvensis clustered only in type 2. The results from present study suggest that the palynological characters can be useful for clarifying the taxonomic relationship in the genus.
{"title":"A palynological investigation of some taxa of the genus Ranunculus L. (Ranunculaceae) in Turkey and its taxonomic value","authors":"M. Kurşat, Neriman Özdağ, B. Başer, FAHRETTİN ÖZBEY, I. Emre","doi":"10.1080/01916122.2022.2095053","DOIUrl":"https://doi.org/10.1080/01916122.2022.2095053","url":null,"abstract":"Abstract Ranunculus L. (Ranunculaceae) is morphologically very diverse and palynological characters support the systematic studies of the genus. This study was aimed to perform palynological investigations of 30 different taxa of Ranunculus by using light microscope (LM) and scanning electron microscopy (SEM) methods. Polar-equatorial axis measurements, exine-intine layer thicknesses and colpi-pori numbers of pollen grains were examined using the Wodehouse method. Surface ornamentations were determined by electron microscope. The dendrogram of palynological characters analysed on the LM and SEM and observations made by multi-variate statistical package software partly support the monophyletic genera. According to the palynological dendrogram, Ranunculus taxa are divided into three types and R. arvensis clustered only in type 2. The results from present study suggest that the palynological characters can be useful for clarifying the taxonomic relationship in the genus.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 13"},"PeriodicalIF":1.5,"publicationDate":"2022-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47692030","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}
Pub Date : 2022-06-24DOI: 10.1080/01916122.2022.2094014
Aslı Özkök, Okan Sezer, O. Koyuncu, İ. Potoğlu Erkara
Abstract The objective of the present study is to investigate pollen morphology and taxonomy of some Apiaceae species in Bilecik, Turkey. The study area is restricted to Vezirhan in the south (Bilecik), Pamukova and Geyve in the north (Sakarya), İznik in the west (Bursa), Gölpazarı in the south-east (Bilecik) and Taraklı in the east (Sakarya). Apiaceae species were collected from the study area by visiting there in all four seasons. In this study, the pollen morphology of 22 taxa belonging to different genera of the Apiaceae family was investigated for the first time in detail using light microscope and scanning electron microscopy (SEM). The pollen is radially symmetrical, isopolar and tricolporate in all examined species. Pollen grains are perprolate, prolate and subprolate with the polar axis ranging from 17.53 µm (Non-acetolysed: N) and 18.28 µm (Acetolysed: A) to 39.71 µm (N) and 39.72 µm (A) and the equatorial axis from 11.77 µm (N) and 12.2 µm (A) to 23.77 µm (N) and 23.54 µm (A). The polar shapes of the studied taxa are triangular. Exine ornamentations of four pollen types have been observed by SEM. Two main groups were revealed in the dendrogram which was constructed by using Average Linkage from the examined data. It was determined that some pollen characteristics of investigated Apiaceae taxa are supporters of the classification of taxa with other taxonomical characteristics. Also, three components of investigated palynological characteristics were identified with principal component analysis. Polar axis (P), equatorial axis (E), the ratio of polar axis to equatorial axis (P/E) (pollen shape) and ornamentation in the polar and equatorial views are determined as the most important palynological characteristics for discrimination of the Apiaceae taxa.
{"title":"Palynomorphological and taxonomical investigations of some Apiaceae taxa from Bilecik, Turkey","authors":"Aslı Özkök, Okan Sezer, O. Koyuncu, İ. Potoğlu Erkara","doi":"10.1080/01916122.2022.2094014","DOIUrl":"https://doi.org/10.1080/01916122.2022.2094014","url":null,"abstract":"Abstract The objective of the present study is to investigate pollen morphology and taxonomy of some Apiaceae species in Bilecik, Turkey. The study area is restricted to Vezirhan in the south (Bilecik), Pamukova and Geyve in the north (Sakarya), İznik in the west (Bursa), Gölpazarı in the south-east (Bilecik) and Taraklı in the east (Sakarya). Apiaceae species were collected from the study area by visiting there in all four seasons. In this study, the pollen morphology of 22 taxa belonging to different genera of the Apiaceae family was investigated for the first time in detail using light microscope and scanning electron microscopy (SEM). The pollen is radially symmetrical, isopolar and tricolporate in all examined species. Pollen grains are perprolate, prolate and subprolate with the polar axis ranging from 17.53 µm (Non-acetolysed: N) and 18.28 µm (Acetolysed: A) to 39.71 µm (N) and 39.72 µm (A) and the equatorial axis from 11.77 µm (N) and 12.2 µm (A) to 23.77 µm (N) and 23.54 µm (A). The polar shapes of the studied taxa are triangular. Exine ornamentations of four pollen types have been observed by SEM. Two main groups were revealed in the dendrogram which was constructed by using Average Linkage from the examined data. It was determined that some pollen characteristics of investigated Apiaceae taxa are supporters of the classification of taxa with other taxonomical characteristics. Also, three components of investigated palynological characteristics were identified with principal component analysis. Polar axis (P), equatorial axis (E), the ratio of polar axis to equatorial axis (P/E) (pollen shape) and ornamentation in the polar and equatorial views are determined as the most important palynological characteristics for discrimination of the Apiaceae taxa.","PeriodicalId":54644,"journal":{"name":"Palynology","volume":" ","pages":"1 - 16"},"PeriodicalIF":1.5,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43910508","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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