Pub Date : 2020-07-22DOI: 10.5252/cryptogamie-algologie2020v41a9
Rita Cordeiro, R. Luz, V. Vasconcelos, Amélia Fonseca, V. Gonçalves
ABSTRACT Cyanobacteria are diverse, complex and a unique group of microorganisms that inhabit a wide variety of environments. Contrarily to continental areas, studies on cyanobacteria in islands are scarce and need to be reinforced, since climate change impacts are expected to be harsher in islands, due to their geographical isolation and higher exposition to external influences. Here we present a review of the occurrence of cyanobacteria and cyanotoxins in inland and coastal ecosystems in the Atlantic Ocean islands. These microorganisms were reported from diverse habitats, including saline thermal lakes (Iceland), freshwater lakes, terrestrial habitats (Azores, Cuba), and marine coastal areas, either planktonic (Madeira, Canary Islands, Cape Verde) or associated to plants and corals (Brazil, Caribbean Sea). Most of cyanobacteria were reported from freshwaters but some species were found in different habitats. Species richness also varied between islands, with higher number in islands located in temperate regions, and the number of common taxa was low (1-3%). Several toxic species and different types of cyanotoxins were also reported in the Atlantic islands, which are expected to increase with climate change. Mitigation measures should be considered to avoid cyanotoxins risks to environmental and public health. This works shows the great potential of Atlantic islands for cyanobacteria taxonomic, ecological and biogeography research, but more studies are needed with emphasis on less studied islands and habitats and using novel approaches as molecular systematics tools. Furthermore, such studies are of paramount importance for environmental conservation and management strategies, especially facing climate changes.
{"title":"A Critical Review of Cyanobacteria Distribution and Cyanotoxins Occurrence in Atlantic Ocean Islands","authors":"Rita Cordeiro, R. Luz, V. Vasconcelos, Amélia Fonseca, V. Gonçalves","doi":"10.5252/cryptogamie-algologie2020v41a9","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a9","url":null,"abstract":"ABSTRACT Cyanobacteria are diverse, complex and a unique group of microorganisms that inhabit a wide variety of environments. Contrarily to continental areas, studies on cyanobacteria in islands are scarce and need to be reinforced, since climate change impacts are expected to be harsher in islands, due to their geographical isolation and higher exposition to external influences. Here we present a review of the occurrence of cyanobacteria and cyanotoxins in inland and coastal ecosystems in the Atlantic Ocean islands. These microorganisms were reported from diverse habitats, including saline thermal lakes (Iceland), freshwater lakes, terrestrial habitats (Azores, Cuba), and marine coastal areas, either planktonic (Madeira, Canary Islands, Cape Verde) or associated to plants and corals (Brazil, Caribbean Sea). Most of cyanobacteria were reported from freshwaters but some species were found in different habitats. Species richness also varied between islands, with higher number in islands located in temperate regions, and the number of common taxa was low (1-3%). Several toxic species and different types of cyanotoxins were also reported in the Atlantic islands, which are expected to increase with climate change. Mitigation measures should be considered to avoid cyanotoxins risks to environmental and public health. This works shows the great potential of Atlantic islands for cyanobacteria taxonomic, ecological and biogeography research, but more studies are needed with emphasis on less studied islands and habitats and using novel approaches as molecular systematics tools. Furthermore, such studies are of paramount importance for environmental conservation and management strategies, especially facing climate changes.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89903050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-05DOI: 10.5252/cryptogamie-algologie2020v41a8
Cristina Piñeiro‐Corbeira, C. Maggs, F. Rindi, Francis Bunker, L. Baldock, P. Díaz-Tapia
ABSTRACT The use of molecular tools often shows that regional species diversity differs from what we know from assessments based on morphological identifications. The seaweed flora of the British Isles has been well established over a long period from foundational work published during the XVIII-XIX centuries to more recent revisions based on molecular tools. The application of these tools (primarily rbcL sequences), alongside morphological observations, to the study of the tribes Streblocladieae and Polysiphonieae in the British Isles led us to three new records of species, as well as two species that require taxonomic revision. Polysiphonia morrowii Harvey, P. delicata Díaz-Tapia and Vertebrata tripinnata (Harvey) Kuntze are recorded for the first time in the British Isles. Finding P. morrowii and P. delicata, which are considered introduced or cryptogenic in Europe, is not surprising and these new records improve our knowledge of their distribution. Vertebrata tripinnata had previously been recorded in southern Europe and collecting it on the northern coast of Ireland considerably expands its known distribution. We also found that rbcL and cox1 sequences for the morphologically divergent V. simulans (Harvey) Kuntze and P. ceramiiformis P.Crouan & H.Crouan (which has never been transferred to Vertebrata) from the British Isles were identical, and we propose to reduce the latter to a synonym of the former. Finally, we found two pseudo-cryptic species represented in specimens morphologically assigned to V. fruticulosa (Wulfen) Kuntze, and we propose the resurrection of V. martensiana (Kützing) Piñeiro-Corbeira, Maggs & Díaz-Tapia. This work further evidences the relevance of reassessing red algal species diversity using molecular tools, even in regions where floras are considered well-known.
{"title":"Molecular Assessment of the Tribes Streblocladieae and Polysiphonieae (Rhodomelaceae, Rhodophyta) in the British Isles Reveals New Records and Species that Require Taxonomic Revision","authors":"Cristina Piñeiro‐Corbeira, C. Maggs, F. Rindi, Francis Bunker, L. Baldock, P. Díaz-Tapia","doi":"10.5252/cryptogamie-algologie2020v41a8","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a8","url":null,"abstract":"ABSTRACT The use of molecular tools often shows that regional species diversity differs from what we know from assessments based on morphological identifications. The seaweed flora of the British Isles has been well established over a long period from foundational work published during the XVIII-XIX centuries to more recent revisions based on molecular tools. The application of these tools (primarily rbcL sequences), alongside morphological observations, to the study of the tribes Streblocladieae and Polysiphonieae in the British Isles led us to three new records of species, as well as two species that require taxonomic revision. Polysiphonia morrowii Harvey, P. delicata Díaz-Tapia and Vertebrata tripinnata (Harvey) Kuntze are recorded for the first time in the British Isles. Finding P. morrowii and P. delicata, which are considered introduced or cryptogenic in Europe, is not surprising and these new records improve our knowledge of their distribution. Vertebrata tripinnata had previously been recorded in southern Europe and collecting it on the northern coast of Ireland considerably expands its known distribution. We also found that rbcL and cox1 sequences for the morphologically divergent V. simulans (Harvey) Kuntze and P. ceramiiformis P.Crouan & H.Crouan (which has never been transferred to Vertebrata) from the British Isles were identical, and we propose to reduce the latter to a synonym of the former. Finally, we found two pseudo-cryptic species represented in specimens morphologically assigned to V. fruticulosa (Wulfen) Kuntze, and we propose the resurrection of V. martensiana (Kützing) Piñeiro-Corbeira, Maggs & Díaz-Tapia. This work further evidences the relevance of reassessing red algal species diversity using molecular tools, even in regions where floras are considered well-known.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83469004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-23DOI: 10.5252/cryptogamie-algologie2020v41a7
Aurélie Boisnoir, Pierre-Yves Pascal, N. Chomérat, R. Lémée
ABSTRACT For the first time, distribution of epiphytic dinoflagellates was studied in Saint Martin Island (Lesser Antilles) during the cyclonic season (between September 1st and 3rd, 2015). The present study provides a semi-quantitative analysis because the fresh weight of each macrophyte was estimated around 10 g. The identified genera were: Ostreopsis J.Schmidt, Prorocentrum Ehrenberg, Coolia Meunier, Amphidinium Claperède & Lachmann, and Gambierdiscus Adachi & Fukuyo in order of decreasing abundance. Highest average abundance values of the genera Ostreopsis and Amphidinium were hosted by macrophytes of the Phaeophyceae class with c. 15 000 and 60 cells g–1 respectively. Epiphytic Coolia cells were mainly observed on seagrasses with the highest average abundance value of c. 1000 cells g–1 whereas the genera Gambierdiscus and Prorocentrum were most often associated with Florideophyceae with the highest average abundances of c. 70 and 1500 cells g–1 respectively. This preliminary study indicates the most relevant locations to survey the biodiversity of potentially toxic epiphytic dinoflagellates in Saint Martin Island.
{"title":"Distribution of Potentially Toxic Epiphytic Dinoflagellates in Saint Martin Island (Caribbean Sea, Lesser Antilles)","authors":"Aurélie Boisnoir, Pierre-Yves Pascal, N. Chomérat, R. Lémée","doi":"10.5252/cryptogamie-algologie2020v41a7","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a7","url":null,"abstract":"ABSTRACT For the first time, distribution of epiphytic dinoflagellates was studied in Saint Martin Island (Lesser Antilles) during the cyclonic season (between September 1st and 3rd, 2015). The present study provides a semi-quantitative analysis because the fresh weight of each macrophyte was estimated around 10 g. The identified genera were: Ostreopsis J.Schmidt, Prorocentrum Ehrenberg, Coolia Meunier, Amphidinium Claperède & Lachmann, and Gambierdiscus Adachi & Fukuyo in order of decreasing abundance. Highest average abundance values of the genera Ostreopsis and Amphidinium were hosted by macrophytes of the Phaeophyceae class with c. 15 000 and 60 cells g–1 respectively. Epiphytic Coolia cells were mainly observed on seagrasses with the highest average abundance value of c. 1000 cells g–1 whereas the genera Gambierdiscus and Prorocentrum were most often associated with Florideophyceae with the highest average abundances of c. 70 and 1500 cells g–1 respectively. This preliminary study indicates the most relevant locations to survey the biodiversity of potentially toxic epiphytic dinoflagellates in Saint Martin Island.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78652846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-17DOI: 10.5252/cryptogamie-algologie2020v41a6
Y. Zakharova, Y. Bedoshvili, D. Petrova, A. Marchenkov, N. A. Volokitina, M. Bashenkhaeva, L. Kopyrina, M. Grachev, Y. Likhoshway
ABSTRACT Diatoms from the extreme cold habitats in northern areas of East Siberia are still poorly studied. Ecological significance of the lakes of the Pole of Cold of the Northern Hemisphere consists in their pristine environment characterized by special environmental factors, such as the long ice cover period, low temperatures, short vegetative period, low photosynthetically active radiation, deficiency of nutrients. Such water systems can thus be used as sensitive indicators of environmental changes. The diatom Ulnaria ulna (Nitzsch) Compère from the genus Ulnaria (Kützing) Compère is widespread in fresh and brackish waters of the world, both in plankton and in benthos, which raises questions about the actual distribution of this species and the presence of cryptic species hidden under this name. In this study, monoclonal cultures of Ulnaria were isolated from epilithic microphytobenthos collected in Lake Labynkyr, located in the northern Pole of Cold region in the Sakha Republic (Yakutia), and were investigated in detail by light and scanning electron microscopy and phylogenetic analysis of the rbcL gene fragments. Cells in culture were able to attach to the substrate with mucilage strands secreted through the pore fields of both valves at one end of the cell. The results of the morphometric and phylogenetic analyses enabled to identify the isolated clones as Ulnaria pilum Kulikovskiy & Lange-Bertalot and showed that species morhoplogical variability is larger than originally described.
{"title":"Morphological description and molecular phylogeny of two diatom clones from the genus Ulnaria (Kützing) Compère isolated from an ultraoligotrophic lake at the Pole of Cold in the Northern Hemisphere, Republic of Sakha (Yakutia), Russia","authors":"Y. Zakharova, Y. Bedoshvili, D. Petrova, A. Marchenkov, N. A. Volokitina, M. Bashenkhaeva, L. Kopyrina, M. Grachev, Y. Likhoshway","doi":"10.5252/cryptogamie-algologie2020v41a6","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a6","url":null,"abstract":"ABSTRACT Diatoms from the extreme cold habitats in northern areas of East Siberia are still poorly studied. Ecological significance of the lakes of the Pole of Cold of the Northern Hemisphere consists in their pristine environment characterized by special environmental factors, such as the long ice cover period, low temperatures, short vegetative period, low photosynthetically active radiation, deficiency of nutrients. Such water systems can thus be used as sensitive indicators of environmental changes. The diatom Ulnaria ulna (Nitzsch) Compère from the genus Ulnaria (Kützing) Compère is widespread in fresh and brackish waters of the world, both in plankton and in benthos, which raises questions about the actual distribution of this species and the presence of cryptic species hidden under this name. In this study, monoclonal cultures of Ulnaria were isolated from epilithic microphytobenthos collected in Lake Labynkyr, located in the northern Pole of Cold region in the Sakha Republic (Yakutia), and were investigated in detail by light and scanning electron microscopy and phylogenetic analysis of the rbcL gene fragments. Cells in culture were able to attach to the substrate with mucilage strands secreted through the pore fields of both valves at one end of the cell. The results of the morphometric and phylogenetic analyses enabled to identify the isolated clones as Ulnaria pilum Kulikovskiy & Lange-Bertalot and showed that species morhoplogical variability is larger than originally described.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85932081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-01DOI: 10.5252/cryptogamie-algologie2020v41a5
C. Boudouresque, R. Semroud, A. Blanfuné, M. Perret-Boudouresque
ABSTRACT In the Mediterranean Sea, the north-east Atlantic seaweed Saccorhiza polyschides (Lightfoot) Batters is uncommon. The only permanent populations are located in the Alboran Sea near the Strait of Gibraltar and the Strait of Messina (Italy). In contrast, since the early 19th century, several sightings, on ship's hulls or in harbours, reflect the dispersal of propagules which failed to establish in the Mediterranean. Here we report a new sighting of Saccorhiza polyschides, near the port of Jijel, Algeria. This first new record in the Mediterranean for more than a century indicates that the dispersal of propagules continues today. In addition, because of its spectacular size and ease of its observation, it sheds light on the expansion routes of a species at the limit of their current range area.
{"title":"Sighting of Saccorhiza polyschides (Lightfoot) Batters (Phaeophyceae, Stramenopiles) in Algeria (Mediterranean Sea): an Insight into Range Expansion Routes","authors":"C. Boudouresque, R. Semroud, A. Blanfuné, M. Perret-Boudouresque","doi":"10.5252/cryptogamie-algologie2020v41a5","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a5","url":null,"abstract":"ABSTRACT In the Mediterranean Sea, the north-east Atlantic seaweed Saccorhiza polyschides (Lightfoot) Batters is uncommon. The only permanent populations are located in the Alboran Sea near the Strait of Gibraltar and the Strait of Messina (Italy). In contrast, since the early 19th century, several sightings, on ship's hulls or in harbours, reflect the dispersal of propagules which failed to establish in the Mediterranean. Here we report a new sighting of Saccorhiza polyschides, near the port of Jijel, Algeria. This first new record in the Mediterranean for more than a century indicates that the dispersal of propagules continues today. In addition, because of its spectacular size and ease of its observation, it sheds light on the expansion routes of a species at the limit of their current range area.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75581851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-20DOI: 10.5252/cryptogamie-algologie2020v41a4
F. Gómez, L. Courcot, L. Artigas
ABSTRACT The consortium of the epizoic diatom Sceptronema orientale Takano on living individuals of the harpacticoid copepod Euterpina acutifrons Dana was found in summer 2018 in the port of Brest, Celtic Seas, and in several locations of the open English Channel during the summer-autumn transition. Diatoms as epibionts on copepods remained unreported up to date in the region despite the high tradition of plankton observations. Tabularia parva (Kützing) D.M.Williams & Round was attached to the empty carapace of a copepod in the port of Brest. The detailed morphology is illustrated by scanning electron microscopy.
2018年夏季，在凯尔特海布雷斯特港和英吉利海峡开放海域的几个地方，发现了动物硅藻对羽类桡足动物(Euterpina acutfrons Dana)活体个体的影响。尽管浮游生物观测的传统很高，但硅藻作为桡足类表面生物在该地区至今尚未报道。在布雷斯特港，D.M.Williams & Round将Tabularia parva (k tzing)附着在一只桡足动物的空甲壳上。扫描电子显微镜显示了其详细的形貌。
{"title":"Observations of the Diatoms Sceptronema orientale Takano and Tabularia parva (Kützing) D.M.Williams & Round on the Exoskeleton of Copepods in the English Channel and Coastal Celtic Seas","authors":"F. Gómez, L. Courcot, L. Artigas","doi":"10.5252/cryptogamie-algologie2020v41a4","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a4","url":null,"abstract":"ABSTRACT The consortium of the epizoic diatom Sceptronema orientale Takano on living individuals of the harpacticoid copepod Euterpina acutifrons Dana was found in summer 2018 in the port of Brest, Celtic Seas, and in several locations of the open English Channel during the summer-autumn transition. Diatoms as epibionts on copepods remained unreported up to date in the region despite the high tradition of plankton observations. Tabularia parva (Kützing) D.M.Williams & Round was attached to the empty carapace of a copepod in the port of Brest. The detailed morphology is illustrated by scanning electron microscopy.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76808992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-04DOI: 10.5252/cryptogamie-algologie2020v41a3
J. Huisman, Heroen Verbruggen
ABSTRACT Pseudoderbesia eckloniae Huisman & Verbruggen, sp. nov., is described for specimens collected from Cape Peron, Western Australia, growing epiphytically on the kelp Ecklonia radiata (C.Agardh) J.Agardh. The new species forms a velvety turf on the host and is distinguished from related species by a combination of molecular analyses (rbcL) and morphological characteristics.
{"title":"Pseudoderbesia Eckloniae, sp. nov. (Bryopsidaceae, Ulvophyceae) from Western Australia","authors":"J. Huisman, Heroen Verbruggen","doi":"10.5252/cryptogamie-algologie2020v41a3","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a3","url":null,"abstract":"ABSTRACT Pseudoderbesia eckloniae Huisman & Verbruggen, sp. nov., is described for specimens collected from Cape Peron, Western Australia, growing epiphytically on the kelp Ecklonia radiata (C.Agardh) J.Agardh. The new species forms a velvety turf on the host and is distinguished from related species by a combination of molecular analyses (rbcL) and morphological characteristics.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79556736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-19DOI: 10.5252/cryptogamie-algologie2020v41a2
Surajit Roy, C. Radhakrishnan, Jonathan C. Taylor, M. Kulikovskiy, B. Karthick
ABSTRACT Despite more than 150 years of diatom research in India, cymbelloid taxa have rarely been investigated when compared to the other parts of the world. A new freshwater species of Encyonema Kützing was discovered from the mountain ranges of Peninsular India and is described based on light and scanning electron microscopy observations. This paper provides a comparison of the new taxa with morphologically similar taxa of the genus Encyonema. Encyonema keshrii, sp. nov., is characterized on the basis of distinctive morphological characters including valve and apex shape as well as striae density. Enccyonema keshrii, sp. nov., is found to be a wide spread taxon with distribution across the Eastern Ghats, Western Ghats and the Eastern Himalayas of Indian subcontinent.
尽管在印度进行了150多年的硅藻研究，但与世界其他地区相比，小叶藻分类群很少被调查。在印度半岛的山脉中发现了一种新的淡水Encyonema k tzing，并根据光学和扫描电子显微镜观察进行了描述。本文将这一新分类群与形态学上相似的Encyonema属分类群进行了比较。keshrii, sp. nov.具有独特的形态特征，包括阀形和先端形状以及条纹密度。Enccyonema keshrii, sp. nov.是一个分布广泛的分类群，分布在印度次大陆的东高止山脉、西高止山脉和东喜马拉雅山脉。
{"title":"Encyonema keshrii, sp. nov.: A New Diatom Species (Cymbellales, Bacillariophyceae) from the Indian Subcontinent","authors":"Surajit Roy, C. Radhakrishnan, Jonathan C. Taylor, M. Kulikovskiy, B. Karthick","doi":"10.5252/cryptogamie-algologie2020v41a2","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a2","url":null,"abstract":"ABSTRACT Despite more than 150 years of diatom research in India, cymbelloid taxa have rarely been investigated when compared to the other parts of the world. A new freshwater species of Encyonema Kützing was discovered from the mountain ranges of Peninsular India and is described based on light and scanning electron microscopy observations. This paper provides a comparison of the new taxa with morphologically similar taxa of the genus Encyonema. Encyonema keshrii, sp. nov., is characterized on the basis of distinctive morphological characters including valve and apex shape as well as striae density. Enccyonema keshrii, sp. nov., is found to be a wide spread taxon with distribution across the Eastern Ghats, Western Ghats and the Eastern Himalayas of Indian subcontinent.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75202888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-10DOI: 10.5252/cryptogamie-algologie2020v41a1
René Le Cohu, Julien Marquié, L. Tudesque
ABSTRACT During a survey of epilithic diatoms in the running water of the main island of New Caledonia, a new species was found: Adlafia diahotensis Le Cohu, Marquié & Tudesque, sp. nov. This species is characterized by the valve outline with ends wedge shaped obtusely rounded. In light microscopy, the striae are only discernible in the center of the valve. In scanning electron microscopy, the internal proximal raphe endings are shortly deflected towards the primary side of the valve and far apart from each other.
在对新喀里多尼亚主岛自来水中的鳞硅藻进行调查时，发现了一个新种:Adlafia diahotensis Le Cohu, marqui & Tudesque, sp. 11 .该种的特征是阀形轮廓，末端呈楔形钝圆形。在光镜下，这些条纹仅在瓣膜的中心可见。在扫描电子显微镜下，内部近端中缝末端很快向瓣膜的主侧偏转，彼此相距很远。
{"title":"Adlafia diahotensis, sp. nov. (Bacillariophyceae), a New Species from New Caledonia","authors":"René Le Cohu, Julien Marquié, L. Tudesque","doi":"10.5252/cryptogamie-algologie2020v41a1","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2020v41a1","url":null,"abstract":"ABSTRACT During a survey of epilithic diatoms in the running water of the main island of New Caledonia, a new species was found: Adlafia diahotensis Le Cohu, Marquié & Tudesque, sp. nov. This species is characterized by the valve outline with ends wedge shaped obtusely rounded. In light microscopy, the striae are only discernible in the center of the valve. In scanning electron microscopy, the internal proximal raphe endings are shortly deflected towards the primary side of the valve and far apart from each other.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79590443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-11DOI: 10.5252/cryptogamie-algologie2019v40a11
Bing Liu, David M. Williams, S. Blanco, Zhu-xiang Liu, Dan Liu
ABSTRACT Three new species of Ulnaria (Kützing) Compère are described based on light and scanning electric microscopy observations. Ulnaria oxybiseriata D.M. Williams & Bing Liu, sp. nov., has linear-lanceolate to lanceolate valves with apiculate and produced ends, biseriate striae, and a central area mostly forming an incomplete fascia surrounded by shortened striae on one side. Ulnaria jinbianensis S. Blanco & Bing Liu, sp. nov., bears linear-lanceolate valves with rostrate to subrostrate ends in larger valves and cuneate ends in smaller valves, uniseriate stria, and a central area forming a rectangular to trapezoid fascia. Ulnaria dongtingensis Bing Liu, sp. nov., possesses a narrow-lanceolate valve outline with produced rostrate to capitate ends, uniseriate stria, and a central area forming almost square fascia. The valvocopula of all three new species bears the same ultrastructure: 1) a complete valvocopula is a closed ring with the same shape as the valve outline, closely attached to the mantle interior surrounding the valve margin; 2) each valvocopula present a row of poroids which bisects the pars interior and exterior; 3) valvocopula with sawtooth-shaped projections attached to the valve over virgae internally; and 4) the valvocopula closed and hyaline at both apices. All three species were found in alkaline freshwater (around pH 8) with moderate conductivity (c. 102-221 µS/cm).
摘要根据光镜和扫描电镜观察，描述了乌尔纳利亚(k tzing) compcompre的3个新种。叶瓣为线状披针形至披针形，末端具细尖，有双棱纹，中部大部分形成不完整的膜，被一侧的短纹包围。金边尺蠖(Ulnaria jinbianensis S. Blanco)和刘兵(Bing Liu, p. nov.)具有线状披针形的球阀，较大的球阀具有顶状到底状的端部，较小的球阀具有楔形的端部，单叶条纹，中心区域形成矩形到梯形的瓣膜。冬青叶，刘兵，sp. nov.，具有窄披针形的阀形轮廓，端部为平头状，条纹单列，中心区域形成近方形的瓣膜。三个新种的瓣膜瓣具有相同的超微结构:1)完整的瓣膜瓣瓣是一个与瓣膜轮廓形状相同的封闭环，紧密地附着在围绕瓣膜边缘的地幔内部;(2)每个瓣孔上有一排孔，将瓣内和瓣外分两半;3)阀孔，具锯齿状突起，在阀腔内部与阀相连;4)瓣口两端闭合透明。这三种物种均在pH 8左右的碱性淡水中发现，电导率适中(c. 102-221µS/cm)。
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