Pub Date : 2021-04-03DOI: 10.1080/0269249X.2021.1880974
David M. Williams, B. Karthick
The genus name Synedra should now be used only for a group of marine species previously included in Catacombas, the latter name becoming a junior synonym. From a purely nomenclatural point of view, as numerous names remain in Synedra when they clearly do not belong there, a problem exists in how to treat those names. Two suggestions are made. One might explore existing names and their associated data; or one may treat the matter as a scientific problem, the problem of taxon relationships at various levels in the taxonomic hierarchy (genus, family, order, etc.), and explore the issue via systematic treatment of groups of species from the point of view of their monophyly. Monophyletic classifications at all ranks and supported by evidence (characters) allows a more scientific approach to understanding the relationships among various groups of species.
{"title":"The correct use of the names Synedra Ehrenberg and Catacombas Williams & Round, a note on the name ‘Hystrix Bory 1822’, and some suggestions how to tackle the taxonomic relationships of Synedra","authors":"David M. Williams, B. Karthick","doi":"10.1080/0269249X.2021.1880974","DOIUrl":"https://doi.org/10.1080/0269249X.2021.1880974","url":null,"abstract":"The genus name Synedra should now be used only for a group of marine species previously included in Catacombas, the latter name becoming a junior synonym. From a purely nomenclatural point of view, as numerous names remain in Synedra when they clearly do not belong there, a problem exists in how to treat those names. Two suggestions are made. One might explore existing names and their associated data; or one may treat the matter as a scientific problem, the problem of taxon relationships at various levels in the taxonomic hierarchy (genus, family, order, etc.), and explore the issue via systematic treatment of groups of species from the point of view of their monophyly. Monophyletic classifications at all ranks and supported by evidence (characters) allows a more scientific approach to understanding the relationships among various groups of species.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2021.1880974","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46225782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-03DOI: 10.1080/0269249X.2021.1921039
Adil Y. AL-HANDAL, O. Romero, S. L. Eggers, A. Wulff
We investigated the ultrastructure of Achnanthes delicatissima Simonsen in materials collected from the Swedish Baltic coast. Valve structure differs markedly from that of Achnanthes sensu lato, particularly in the absence of cribrate areolae which separates Achnanthes from all other members of the family Achnanthaceae. Comparing this species with those recently described achnanthoid genera, such as Scalariella Riaux-Gobin & Witkowski and Madinithidium Witkowski, Desrosiers & Riaux-Gobin revealed morphological differences that warrant the erection of a new genus, Navithidium. Owing to the small size of the frustules, it is difficult to identify Navithidium delicatissima in light microscopy due to similarities with some closely related taxa like Achnanthidium pseudochamaepinnularia (which is here transferred to Navithidium). A comparison with related genera is provided and discussed.
{"title":"Navithidium gen. nov., a new monoraphid diatom (Bacillariophyceae) genus based on Achnanthes delicatissima Simonsen","authors":"Adil Y. AL-HANDAL, O. Romero, S. L. Eggers, A. Wulff","doi":"10.1080/0269249X.2021.1921039","DOIUrl":"https://doi.org/10.1080/0269249X.2021.1921039","url":null,"abstract":"We investigated the ultrastructure of Achnanthes delicatissima Simonsen in materials collected from the Swedish Baltic coast. Valve structure differs markedly from that of Achnanthes sensu lato, particularly in the absence of cribrate areolae which separates Achnanthes from all other members of the family Achnanthaceae. Comparing this species with those recently described achnanthoid genera, such as Scalariella Riaux-Gobin & Witkowski and Madinithidium Witkowski, Desrosiers & Riaux-Gobin revealed morphological differences that warrant the erection of a new genus, Navithidium. Owing to the small size of the frustules, it is difficult to identify Navithidium delicatissima in light microscopy due to similarities with some closely related taxa like Achnanthidium pseudochamaepinnularia (which is here transferred to Navithidium). A comparison with related genera is provided and discussed.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2021.1921039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46968358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/0269249X.2020.1853608
M. Kulikovskiy, D. Chudaev, A. Glushchenko, I. Kuznetsova, L. Frolova, J. Kociolek
We present light and scanning electron microscopical observations on two new species of Navicula Bory sensu stricto from Vietnam. These new species, Navicula babeiensis Chudaev, Glushchenko, Kulikovskiy & Kociolek sp. nov. and Navicula pseudokuseliana Chudaev, Glushchenko, Kulikovskiy & Kociolek sp. nov. are described and distinguished from others in the genus on the basis of valve outline and shape of the apices, as well as stria and areola densities. These species possess all the typical morphological features for the genus, including uniseriate lineolate striae covered by internal convex hymenes, median raphe with accessory rib, and external distal raphe ends that are hooked in the characteristic way for the genus. Comparisons with similar taxa are given. Our new data extend the information about the diversity of diatoms in general and for Navicula taxa specifically, in Southeast Asia.
本文对来自越南的两个新物种——宽吻海鞘（Navicula Bory senso stricto）进行了光镜和扫描电子显微镜观察。这些新物种，巴贝氏Navicula babeiensis Chudaev，Glushchenko，Kulikovskiy&Kociolek sp.nov.和拟库塞利纳纳Navicula pseudo-kuseliana Chudaev、GlushchenkoKulikovkiy&Kociolek sp.nova.是根据瓣的轮廓和顶端的形状，以及纹和晕的密度来描述和区分本属其他物种的。这些物种具有该属的所有典型形态特征，包括由内凸处女膜覆盖的单列线状条纹、带副肋的中缝和以该属特有方式钩状的中缝远端。给出了与相似分类群的比较。我们的新数据扩展了有关硅藻多样性的信息，特别是东南亚的Navicula分类群的信息。
{"title":"Two new species of the diatom genus Navicula Bory (Bacillariophyceae) from Vietnam (Southeast Asia)","authors":"M. Kulikovskiy, D. Chudaev, A. Glushchenko, I. Kuznetsova, L. Frolova, J. Kociolek","doi":"10.1080/0269249X.2020.1853608","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1853608","url":null,"abstract":"We present light and scanning electron microscopical observations on two new species of Navicula Bory sensu stricto from Vietnam. These new species, Navicula babeiensis Chudaev, Glushchenko, Kulikovskiy & Kociolek sp. nov. and Navicula pseudokuseliana Chudaev, Glushchenko, Kulikovskiy & Kociolek sp. nov. are described and distinguished from others in the genus on the basis of valve outline and shape of the apices, as well as stria and areola densities. These species possess all the typical morphological features for the genus, including uniseriate lineolate striae covered by internal convex hymenes, median raphe with accessory rib, and external distal raphe ends that are hooked in the characteristic way for the genus. Comparisons with similar taxa are given. Our new data extend the information about the diversity of diatoms in general and for Navicula taxa specifically, in Southeast Asia.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1853608","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41664236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/0269249X.2021.1873193
Fen Luo, Q. You, Lixuan Zhang, P. Yu, W. Pang, R. Bixby, Quanxi Wang
Three new species of Hannaea Patrick from the Hengduan Mountains in China are formally described herein, based on light and scanning electron microscope observations. Hannaea yalaensis sp. nov. has three continuous inflations along the ventral margin, resulting in an undulate outline compared to the outline of the most commonly reported Hannaea species. The valve of Hannaea hengduanensis sp. nov. is narrower, asymmetrical about the apical axis with capitate apices, dorsal and ventral sides almost parallel. On the ventral side of valve is an unornamented central area. The valve of Hannaea clavata sp. nov. is clavate. Valve margin is straight or slightly curved. The apices of the valve constrict sharply to form the capitate ends. In addition, we also briefly described other Hannaea from this region. Here, we document the morphologies of these new species and discuss the biogeographic distribution of the genus Hannaea in Asia.
{"title":"Three new species of the diatom genus Hannaea Patrick (Bacillariophyta) from the Hengduan Mountains, China, with notes on Hannaea diversity in the region","authors":"Fen Luo, Q. You, Lixuan Zhang, P. Yu, W. Pang, R. Bixby, Quanxi Wang","doi":"10.1080/0269249X.2021.1873193","DOIUrl":"https://doi.org/10.1080/0269249X.2021.1873193","url":null,"abstract":"Three new species of Hannaea Patrick from the Hengduan Mountains in China are formally described herein, based on light and scanning electron microscope observations. Hannaea yalaensis sp. nov. has three continuous inflations along the ventral margin, resulting in an undulate outline compared to the outline of the most commonly reported Hannaea species. The valve of Hannaea hengduanensis sp. nov. is narrower, asymmetrical about the apical axis with capitate apices, dorsal and ventral sides almost parallel. On the ventral side of valve is an unornamented central area. The valve of Hannaea clavata sp. nov. is clavate. Valve margin is straight or slightly curved. The apices of the valve constrict sharply to form the capitate ends. In addition, we also briefly described other Hannaea from this region. Here, we document the morphologies of these new species and discuss the biogeographic distribution of the genus Hannaea in Asia.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2021.1873193","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49380907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/0269249X.2021.1872708
Yuki Uezato, Kazuki Hoshina, R. Jordan
Light and scanning electron microscope observations on filtered water samples, collected during the subarctic Pacific cruises of the R/V Vema (VEMA 20; May–July 1964) and R/V Robert D. Conrad (CONRAD 10; June–August 1966), have revealed the presence of two seasonal forms of Proboscia macintyrei sp. nov. The ‘spring’ and ‘winter’ cells of the new species are both solitary (lacking claspers), with the ‘spring’ form possessing a much shorter and more domed proboscis. Proboscia macintyrei usually differs from other living Proboscia species by possessing 1–2 thin, long polar spinulae at the proboscis tip, usually situated on one side, to the left of the longitudinal slit (rimoportula). The proboscis of the P. macintyrei ‘winter’ form normally bears longitudinal crease-like ridges, but without the thinner transverse ribs of P. subarctica. The morphology of these two species suggests they are living representatives of the ‘barboi’ lineage. Proboscia eumorpha is sometimes present on the filters, with the ‘winter’ form being documented herein in detail for the first time.
在R/V Vema号（Vema 20；1964年5月至7月）和R/V Robert D.Conrad号（Conrad 10；1966年6月至8月）的亚北极太平洋巡航期间收集的过滤水样本的光学和扫描电子显微镜观察揭示了麦金太里长鼻的两种季节性形式的存在。新物种的“春天”和“冬天”细胞都是孤立的（缺乏钩环），“春天”形态的长鼻更短、更圆顶。麦金太氏长鼻与其他现存长鼻的不同之处在于，长鼻尖端有1-2个细长的极棘，通常位于纵向狭缝（边缘）左侧的一侧。麦金太利“冬季”形态的长鼻通常有纵向折痕状的脊，但没有亚北极P.较薄的横肋。这两个物种的形态表明它们是“barboi”谱系的在世代表。真孔长鼻有时会出现在过滤器上，本文首次详细记录了“冬季”形式。
{"title":"Proboscia macintyrei sp. nov. (Bacillariophyceae) from the subarctic Pacific, and new observations on P. eumorpha","authors":"Yuki Uezato, Kazuki Hoshina, R. Jordan","doi":"10.1080/0269249X.2021.1872708","DOIUrl":"https://doi.org/10.1080/0269249X.2021.1872708","url":null,"abstract":"Light and scanning electron microscope observations on filtered water samples, collected during the subarctic Pacific cruises of the R/V Vema (VEMA 20; May–July 1964) and R/V Robert D. Conrad (CONRAD 10; June–August 1966), have revealed the presence of two seasonal forms of Proboscia macintyrei sp. nov. The ‘spring’ and ‘winter’ cells of the new species are both solitary (lacking claspers), with the ‘spring’ form possessing a much shorter and more domed proboscis. Proboscia macintyrei usually differs from other living Proboscia species by possessing 1–2 thin, long polar spinulae at the proboscis tip, usually situated on one side, to the left of the longitudinal slit (rimoportula). The proboscis of the P. macintyrei ‘winter’ form normally bears longitudinal crease-like ridges, but without the thinner transverse ribs of P. subarctica. The morphology of these two species suggests they are living representatives of the ‘barboi’ lineage. Proboscia eumorpha is sometimes present on the filters, with the ‘winter’ form being documented herein in detail for the first time.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2021.1872708","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44815390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/0269249X.2021.1875053
M. Edlund, D. R. Burge, N. Andresen, David D. VanderMeulen, J. Stone, B. Van de Vijver
The genus Semiorbis was erected by R.M.Patrick in 1966 as monotypic based on the relatively rare taxon Semiorbis hemicyclus. Defining characters for Semiorbis include strongly arcuate valves, short eunotioid raphe branches, well-developed external costae with spine-like projections on the virgae, lack of rimoportulae, and a broader dorsal mantle. New populations of Semiorbis were found in the central USA (Wisconsin) on Outer Island, Apostle Islands National Lakeshore, along southeast Lake Superior, from a lake in New Jersey (USA), and from a small arctic lake in Nunavut, Canada. The population in Outer Lagoon, a shallow embayment cut off from Lake Superior by a long-shore bar, provided documentation of living cells and colonies of Semiorbis. We examined the morphology, ecology, and taxonomy of these new populations using light and scanning electron microscopy, traditional morphometrics, and sliding landmarks shape analysis. We compared these populations to European populations of Semiorbis hemicyclus and North American populations of Semiorbis rotundus and Semiorbis catillifera. We determined that the population found in Wisconsin represents a new species herein described as Semiorbis eliasiae Edlund, D.R.L.Burge, N.A.Andresen & VanderMeulen sp. nov., the New Jersey (USA) population is Semiorbis rotundus, and the Nunavut (Canada) population represents a North American population of the generitype Semiorbis hemicyclus.
{"title":"The genus Semiorbis (Eunotiaceae, Bacillariophyta) in North America","authors":"M. Edlund, D. R. Burge, N. Andresen, David D. VanderMeulen, J. Stone, B. Van de Vijver","doi":"10.1080/0269249X.2021.1875053","DOIUrl":"https://doi.org/10.1080/0269249X.2021.1875053","url":null,"abstract":"The genus Semiorbis was erected by R.M.Patrick in 1966 as monotypic based on the relatively rare taxon Semiorbis hemicyclus. Defining characters for Semiorbis include strongly arcuate valves, short eunotioid raphe branches, well-developed external costae with spine-like projections on the virgae, lack of rimoportulae, and a broader dorsal mantle. New populations of Semiorbis were found in the central USA (Wisconsin) on Outer Island, Apostle Islands National Lakeshore, along southeast Lake Superior, from a lake in New Jersey (USA), and from a small arctic lake in Nunavut, Canada. The population in Outer Lagoon, a shallow embayment cut off from Lake Superior by a long-shore bar, provided documentation of living cells and colonies of Semiorbis. We examined the morphology, ecology, and taxonomy of these new populations using light and scanning electron microscopy, traditional morphometrics, and sliding landmarks shape analysis. We compared these populations to European populations of Semiorbis hemicyclus and North American populations of Semiorbis rotundus and Semiorbis catillifera. We determined that the population found in Wisconsin represents a new species herein described as Semiorbis eliasiae Edlund, D.R.L.Burge, N.A.Andresen & VanderMeulen sp. nov., the New Jersey (USA) population is Semiorbis rotundus, and the Nunavut (Canada) population represents a North American population of the generitype Semiorbis hemicyclus.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2021.1875053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44434869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/0269249X.2020.1848927
D. T. Ruwer, N. C. Osório, Sandra Costa-Böddeker, L. Rodrigues
Long term anthropogenic and natural impacts may result in effects on hydrological and environmental variables in aquatic ecosystems, as floodplain lakes, causing changes in diatom populations and community composition. We hypothesized that temporal abiotic factors over time favoured the establishment and increase in relative abundance of the Achnanthidium minutissimum complex. For a greater understanding of variation in species abundance, we used biomonitoring and paleolimnological data, combining 18 years of data from periphyton samples and more than 60 years from sediment samples. To test the relationships between the environmental parameters and relative abundance of A. minutissimum from biomonitoring data, we used generalized linear models (GLM). Based on GLM, the relative abundance of A. minutissimum increased with lower water depth, lower temperature, higher turbidity, and high pH. These conditions coincide with periods of drought in the floodplain, which were more frequent and longer after the construction of dams near Lake Garças. Additionally, the paleolimnological data suggest that climatic and anthropogenic influences on abiotic factors, such as water level and turbidity may have been responsible for the increased abundance of A. minutissimum in Lake Garças, as well as its dominance in the periphytic community from 2000, after the last dam construction near the lake. This shows how the modification of an aquatic environment can change diatom populations, and highlights the importance of combining historical information, paleolimnological analyses and biomonitoring data to understand population and ecosystem processes over time.
长期的人为和自然影响可能对洪泛区湖泊等水生生态系统的水文和环境变量产生影响，导致硅藻种群和群落组成的变化。我们假设，随着时间的推移，时间上的非生物因素有利于建立和增加相对丰度的微型蜘蛛复合体。为了更好地了解物种丰度的变化，我们使用了生物监测和古湖泊学数据，结合了18年的周围植物样本数据和60多年的沉积物样本数据。采用广义线性模型(generalized linear models, GLM)分析了环境参数与微藻相对丰度之间的关系。GLM结果表明，微藻相对丰度随水深、温度、浊度和ph值的降低而增加。这些条件与garas湖附近建坝后洪泛区干旱发生的频率和时间一致。此外，古湖泊数据表明，气候和人为对非生物因素(如水位和浊度)的影响可能是加尔帕拉达斯湖丰度增加的原因，也是其在2000年湖附近最后一次大坝建设后在周围植物群落中占主导地位的原因。这表明了水生环境的改变如何改变硅藻种群，并强调了将历史信息、古湖泊分析和生物监测数据结合起来了解种群和生态系统过程的重要性。
{"title":"Influence of temporal changes on a diatom species in a floodplain lake: paleolimnological and biomonitoring approach","authors":"D. T. Ruwer, N. C. Osório, Sandra Costa-Böddeker, L. Rodrigues","doi":"10.1080/0269249X.2020.1848927","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1848927","url":null,"abstract":"Long term anthropogenic and natural impacts may result in effects on hydrological and environmental variables in aquatic ecosystems, as floodplain lakes, causing changes in diatom populations and community composition. We hypothesized that temporal abiotic factors over time favoured the establishment and increase in relative abundance of the Achnanthidium minutissimum complex. For a greater understanding of variation in species abundance, we used biomonitoring and paleolimnological data, combining 18 years of data from periphyton samples and more than 60 years from sediment samples. To test the relationships between the environmental parameters and relative abundance of A. minutissimum from biomonitoring data, we used generalized linear models (GLM). Based on GLM, the relative abundance of A. minutissimum increased with lower water depth, lower temperature, higher turbidity, and high pH. These conditions coincide with periods of drought in the floodplain, which were more frequent and longer after the construction of dams near Lake Garças. Additionally, the paleolimnological data suggest that climatic and anthropogenic influences on abiotic factors, such as water level and turbidity may have been responsible for the increased abundance of A. minutissimum in Lake Garças, as well as its dominance in the periphytic community from 2000, after the last dam construction near the lake. This shows how the modification of an aquatic environment can change diatom populations, and highlights the importance of combining historical information, paleolimnological analyses and biomonitoring data to understand population and ecosystem processes over time.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1848927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48419855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/0269249X.2020.1870159
R. Majewska
Although diatoms colonize a vast diversity of immersed hard-surfaced objects and organisms, many diatom species, and sometimes entire genera, show a clear preference towards a particular type of substratum. Studies of animal-associated diatoms indicate that some epizoic forms may require this specific habitat to thrive, and new diatom taxa are expected to be found on as yet unexplored animal hosts. The current study is the first to investigate the diatom flora of sea snakes. Three museum specimens of yellow-bellied sea snakes (Hydrophis platurus) collected over a period of 23 years from the south-eastern coast of South Africa were examined for their diatom flora. Diatoms were abundant on the sea snakes, but communities were composed of only a few species. A previously undescribed species of Nagumoea contributed over 99% of the total diatom assemblage on both the sea snake skin and sea-snake-associated barnacles (Octolasmis sp.). This diatom dominant is described here as Nagumoea hydrophicola sp. nov., based on detailed observations of its frustule ultrastructure using light and scanning electron microscopy. The species is most similar to N. serrata, sharing a similar valvocopula morphology with two rows of pores. However, it can be distinguished from all currently known congeners by its lanceolate central area, short distal raphe endings not reaching the valve mantle, and doubly perforated abvalvar girdle bands. Environmental preferences of the new species are discussed in the context of its host’s biology.
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Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1846079
J. Stone, M. Edlund, Laura C Streib, Hung Ha Quang, M. McGlue
Modern and fossil populations of a Stephanodiscus Ehrenberg species from June Lake, California (USA) were analysed using light and scanning electron microscopy (SEM). Stephanodiscus valves were a major constituent of almost all analysed samples, often dominating fossil assemblages dating back several thousand years. The most commonly observed Stephanodiscus specimen in the samples bore a striking resemblance to the extinct Late Pliocene species Stephanodiscus klamathensis, particularly under light microscopy. The population size range, ultrastructure, and other defining characteristics closely matched published information on S. klamathensis. However, under SEM, internal views of the specimens from June Lake showed an important difference; specimens lacked valve face fultoportulae, whereas S. klamathensis is characterized by the presence of two valve face fultoportulae, each with three satellite pores near the centre of the valve. Additional differences in valve size range, absence of fultoportulae on the valve face, and the fact that S. klamathensis is an extinct species (observed in diatomites deposited from Late Pliocene to Pleistocene) with no closely related living relatives, necessitates describing this Stephanodiscus as a new species. To date, Stephanodiscus coruscus has been observed only in June Lake, California; most Stephanodiscus that share strong morphological similarities to this species have only been observed in ancient fossil diatomites. Thus, Stephanodiscus coruscus Jeff. R. Stone, Edlund & Streib sp. nov. is not only a new species but also provides a rare glimpse into the likely types of environments that S. klamathensis and other similar ancient Stephanodiscus may have inhabited in the late Pliocene. Character variations between S. coruscus and S. klamathensis reveal potential patterns of evolution in freshwater lineages, such as character loss, over time.
{"title":"Stephanodiscus coruscus sp. nov., a new species of diatom (Bacillariophyta) from June Lake, California (USA) with close affiliation to Stephanodiscus klamathensis","authors":"J. Stone, M. Edlund, Laura C Streib, Hung Ha Quang, M. McGlue","doi":"10.1080/0269249x.2020.1846079","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1846079","url":null,"abstract":"Modern and fossil populations of a Stephanodiscus Ehrenberg species from June Lake, California (USA) were analysed using light and scanning electron microscopy (SEM). Stephanodiscus valves were a major constituent of almost all analysed samples, often dominating fossil assemblages dating back several thousand years. The most commonly observed Stephanodiscus specimen in the samples bore a striking resemblance to the extinct Late Pliocene species Stephanodiscus klamathensis, particularly under light microscopy. The population size range, ultrastructure, and other defining characteristics closely matched published information on S. klamathensis. However, under SEM, internal views of the specimens from June Lake showed an important difference; specimens lacked valve face fultoportulae, whereas S. klamathensis is characterized by the presence of two valve face fultoportulae, each with three satellite pores near the centre of the valve. Additional differences in valve size range, absence of fultoportulae on the valve face, and the fact that S. klamathensis is an extinct species (observed in diatomites deposited from Late Pliocene to Pleistocene) with no closely related living relatives, necessitates describing this Stephanodiscus as a new species. To date, Stephanodiscus coruscus has been observed only in June Lake, California; most Stephanodiscus that share strong morphological similarities to this species have only been observed in ancient fossil diatomites. Thus, Stephanodiscus coruscus Jeff. R. Stone, Edlund & Streib sp. nov. is not only a new species but also provides a rare glimpse into the likely types of environments that S. klamathensis and other similar ancient Stephanodiscus may have inhabited in the late Pliocene. Character variations between S. coruscus and S. klamathensis reveal potential patterns of evolution in freshwater lineages, such as character loss, over time.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1846079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42591792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1842253
Adil Y. AL-HANDAL, Maja Mucko, A. Wulff
When the name Entomoneis annagodhei Al-Handal & Mucko was published (Al Handal et al. 2020), an error was made in giving the name of the species. The species is named after the late Professor Dr An...
当Entomoneis annagodhei Al Handal&Mucko的名字发表时（Al Handal等人，2020），在给出物种名称时出现了错误。该物种以已故教授安博士的名字命名。。。
{"title":"Entomoneis annagodheae Al-Handal & Mucko, the correct name for E. annagodhei Al-Handal & Mucko","authors":"Adil Y. AL-HANDAL, Maja Mucko, A. Wulff","doi":"10.1080/0269249x.2020.1842253","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1842253","url":null,"abstract":"When the name Entomoneis annagodhei Al-Handal & Mucko was published (Al Handal et al. 2020), an error was made in giving the name of the species. The species is named after the late Professor Dr An...","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1842253","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43884367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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