Pub Date : 2020-07-02DOI: 10.1080/0269249x.2020.1794982
Jordan Bishop, K. Kopalová, T. Kohler, B. Van de Vijver, D. Roberts, A. McMinn, J. Gibson
The non-marine diatom flora of the Antarctic continent is currently being revised as recent work within the Maritime and Sub-Antarctic regions has unveiled a number of new endemic species. The under reporting of endemic species is partially due to the historic ‘force-fitting’ of Antarctic species into European names. Within East Antarctica, the Vestfold Hills are an extensively studied area known for their diversity of lakes spanning a salinity gradient, for which Diatoms of the saline lakes of the Vestfold Hills, Antarctica by Roberts & McMinn (1999) has a primary identification resource for over two decades. To determine if improved taxonomic resolution alters the ecological interpretation of these lakes, 30 prepared lake sediment samples first examined by Roberts & McMinn (1999) were re-analysed using an updated, fine-grained taxonomic approach. Our analyses confirmed the role of salinity and alkalinity in structuring Vestfold Hills diatom communities. Thus, the increased taxonomic resolution did not change the original ecological interpretation. However, the revised flora of the Vestfold Hills features 37 species endemic to the Antarctic Region, including members of Luticola, Sabbea and Halamphora, among others. In total, 183 taxa across 38 genera were observed, in contrast to the 67 taxa reported in the original work. The revised flora, including a larger proportion of endemic species, may improve our understanding of the diatom community in general and has wider implications for both conservation and biodiversity estimates of Antarctica. More widely applied, these data can be incorporated into larger studies of Antarctic microbial biogeography and biodiversity.
{"title":"A re-investigation of lake sediment diatoms from the Vestfold Hills, Antarctica, using an updated, fine-grained taxonomy","authors":"Jordan Bishop, K. Kopalová, T. Kohler, B. Van de Vijver, D. Roberts, A. McMinn, J. Gibson","doi":"10.1080/0269249x.2020.1794982","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1794982","url":null,"abstract":"The non-marine diatom flora of the Antarctic continent is currently being revised as recent work within the Maritime and Sub-Antarctic regions has unveiled a number of new endemic species. The under reporting of endemic species is partially due to the historic ‘force-fitting’ of Antarctic species into European names. Within East Antarctica, the Vestfold Hills are an extensively studied area known for their diversity of lakes spanning a salinity gradient, for which Diatoms of the saline lakes of the Vestfold Hills, Antarctica by Roberts & McMinn (1999) has a primary identification resource for over two decades. To determine if improved taxonomic resolution alters the ecological interpretation of these lakes, 30 prepared lake sediment samples first examined by Roberts & McMinn (1999) were re-analysed using an updated, fine-grained taxonomic approach. Our analyses confirmed the role of salinity and alkalinity in structuring Vestfold Hills diatom communities. Thus, the increased taxonomic resolution did not change the original ecological interpretation. However, the revised flora of the Vestfold Hills features 37 species endemic to the Antarctic Region, including members of Luticola, Sabbea and Halamphora, among others. In total, 183 taxa across 38 genera were observed, in contrast to the 67 taxa reported in the original work. The revised flora, including a larger proportion of endemic species, may improve our understanding of the diatom community in general and has wider implications for both conservation and biodiversity estimates of Antarctica. More widely applied, these data can be incorporated into larger studies of Antarctic microbial biogeography and biodiversity.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1794982","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43064203","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 : 2020-06-29DOI: 10.1080/0269249x.2020.1749136
Sang Deuk Lee, Hoil Lee, Jinsoon Park, S. Yun, Jin-Young Lee, Jaesoo Lim, Mirye Park, D. Kwon
Late Holocene diatoms were identified from four sediment cores from the Gonggeomji Wetland in Korea. In total, 52 diatom species belonging to three classes, 21 families, and 29 genera were investigated. Of these, 14 species were new records for Korea: Caloneis wardii, Cocconeis klamathensis, Encyonema vulgare, Eunotia myrmica, Fallacia californica, Gomphonema asiaticum, Gomphonema insigniturris, Gomphonema neoapiculatum, Gomphonema tumens, Pinnularia fusana, Pinnularia parvulissima, Punctastriata lancettula, Sellaphora capitata, and Staurosira dimorpha. Eleven taxa could not be identified to the species level. All identified diatoms are illustrated by high-quality scanning electron microphotographs, reference taxonomic data, dimensions of the observed cells, and information on ecology and distribution are included.
{"title":"Late Holocene diatoms in sediment cores from the Gonggeomji Wetland in Korea","authors":"Sang Deuk Lee, Hoil Lee, Jinsoon Park, S. Yun, Jin-Young Lee, Jaesoo Lim, Mirye Park, D. Kwon","doi":"10.1080/0269249x.2020.1749136","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1749136","url":null,"abstract":"Late Holocene diatoms were identified from four sediment cores from the Gonggeomji Wetland in Korea. In total, 52 diatom species belonging to three classes, 21 families, and 29 genera were investigated. Of these, 14 species were new records for Korea: Caloneis wardii, Cocconeis klamathensis, Encyonema vulgare, Eunotia myrmica, Fallacia californica, Gomphonema asiaticum, Gomphonema insigniturris, Gomphonema neoapiculatum, Gomphonema tumens, Pinnularia fusana, Pinnularia parvulissima, Punctastriata lancettula, Sellaphora capitata, and Staurosira dimorpha. Eleven taxa could not be identified to the species level. All identified diatoms are illustrated by high-quality scanning electron microphotographs, reference taxonomic data, dimensions of the observed cells, and information on ecology and distribution are included.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1749136","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47924101","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 : 2020-06-18DOI: 10.1080/0269249x.2020.1772888
D. Kapustin, J. Kociolek, A. Glushchenko, M. Kulikovskiy
The first comprehensive morphological investigation of the rare, endemic species Cymbella mirabilis Hustedt from the Malili lake system (Indonesia) was prepared using recent samples. This species was originally described on the basis of a single valve. The species was assigned to Cymbella sensu lato on the basis of its asymmetry about the apical axis. SEM investigation shows that this species has a number of unique features relative to other freshwater cymbelloid diatoms, such as an axial plate and marginal laminae on either side of the valve and pseudoseptum at each end of the valve. In these features C. mirabilis resembles certain species in genera such as Gomphoneis Cleve, Afrocymbella Krammer, Gomphosinica Kociolek et al. and Gomphonema Ehrenberg. The unique combination of features in this taxon suggest it cannot be placed in any known genus within the Cymbellales. Thus, we describe a new diatom genus, Alveocymba gen. nov., however, the taxonomic placement of this new genus remains unclear and requires further investigation.
利用新近采集的标本，首次对印度尼西亚马里利湖系的珍稀特有种Cymbella mirabilis Hustedt进行了全面的形态学调查。这个物种最初是根据一个阀门来描述的。根据其顶轴不对称的特点，将其归为小叶小叶(Cymbella sensu lato)。扫描电镜研究表明，该物种相对于其他淡水小叶硅藻具有许多独特的特征，例如阀两侧的轴向板和边缘层以及阀两端的假隔膜。在这些特征上，C. mirabilis类似于某些属的物种，如Gomphoneis Cleve, Afrocymbella Krammer, Gomphosinica Kociolek等和Gomphonema Ehrenberg。这个分类群的独特特征组合表明它不可能被放在任何已知的小叶花属中。因此，我们描述了一个新的硅藻属，Alveocymba gen. nov.，然而，这个新属的分类位置仍然不清楚，需要进一步的研究。
{"title":"A rediscovery of Cymbella mirabilis Hustedt, a rare endemic diatom, and description of Alveocymba gen. nov.","authors":"D. Kapustin, J. Kociolek, A. Glushchenko, M. Kulikovskiy","doi":"10.1080/0269249x.2020.1772888","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1772888","url":null,"abstract":"The first comprehensive morphological investigation of the rare, endemic species Cymbella mirabilis Hustedt from the Malili lake system (Indonesia) was prepared using recent samples. This species was originally described on the basis of a single valve. The species was assigned to Cymbella sensu lato on the basis of its asymmetry about the apical axis. SEM investigation shows that this species has a number of unique features relative to other freshwater cymbelloid diatoms, such as an axial plate and marginal laminae on either side of the valve and pseudoseptum at each end of the valve. In these features C. mirabilis resembles certain species in genera such as Gomphoneis Cleve, Afrocymbella Krammer, Gomphosinica Kociolek et al. and Gomphonema Ehrenberg. The unique combination of features in this taxon suggest it cannot be placed in any known genus within the Cymbellales. Thus, we describe a new diatom genus, Alveocymba gen. nov., however, the taxonomic placement of this new genus remains unclear and requires further investigation.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1772888","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48256476","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 : 2020-04-02DOI: 10.1080/0269249X.2020.1764870
J. Stone, M. Edlund, Andrew J. Alverson
We used light and electron microscopy to characterize a Late Miocene freshwater diatomite deposit in the Chalk Hills Formation, near Payette, Idaho, USA. The diatom assemblage from this sample was nearly monotypic, dominated by a single taxon with similarities to Lindavia bodanica (Thalassiosirales) but with several features uncharacteristic of the genus Lindavia, such as a rimoportula(e) on the valve mantle located on a costa, simple alveolar structure, and spines at the external valve face-mantle junction. A combination of other characters for this species complicate its placement into existing genera, including a lack of central fultoportulae, central area with loculate areolae with domed cribra, and a single ring of mantle fultoportulae with three satellite pores with well-developed cowlings and broad satellite pore covers. Based on this unique set of features, we have established a new genus, Fascinorbis, which appears to represent an important transitional form in the evolution of the Lindavia lineage.
{"title":"Fascinorbis gen. nov., a new genus of Stephanodiscaceae (Bacillariophyta) from a Late Miocene lacustrine diatomite","authors":"J. Stone, M. Edlund, Andrew J. Alverson","doi":"10.1080/0269249X.2020.1764870","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1764870","url":null,"abstract":"We used light and electron microscopy to characterize a Late Miocene freshwater diatomite deposit in the Chalk Hills Formation, near Payette, Idaho, USA. The diatom assemblage from this sample was nearly monotypic, dominated by a single taxon with similarities to Lindavia bodanica (Thalassiosirales) but with several features uncharacteristic of the genus Lindavia, such as a rimoportula(e) on the valve mantle located on a costa, simple alveolar structure, and spines at the external valve face-mantle junction. A combination of other characters for this species complicate its placement into existing genera, including a lack of central fultoportulae, central area with loculate areolae with domed cribra, and a single ring of mantle fultoportulae with three satellite pores with well-developed cowlings and broad satellite pore covers. Based on this unique set of features, we have established a new genus, Fascinorbis, which appears to represent an important transitional form in the evolution of the Lindavia lineage.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1764870","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43524178","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 : 2020-04-02DOI: 10.1080/0269249X.2020.1747551
M. Usoltseva, L. Kopyrina, L. Titova, A. Morozov, A. Firsova, Y. Zakharova, M. Bashenkhaeva, M. Maslennikova, Y. Likhoshway
In the northern lakes of Yakutia, Vorota and Labynkyr, which are 2100 kilometres northeast of Lake Baikal, we found a putative Lake Baikal endemic, Lindavia minuta. Morphological analysis and non-metric multidimensional scaling showed that L. minuta populations from Yakutian and Transbaikalian lakes belong to the same (morpho) species. The possible dispersal history is discussed. The most probable hypothesis is that L. minuta was present in the Baikal basin during several Pleistocene glaciation cycles, and since Lake Baikal was previously connected to the River Lena, it is possible that there was a stable population of this species in the river, and that the river carried some cells to other suitable habitats. During glaciated periods, L. minuta could also have survived for longer periods in several ice dam lakes and possibly dispersed further north-east to the lakes in Yakutia.
{"title":"Finding of a putative Lake Baikal endemic, Lindavia minuta, in distant lakes near the Arctic pole in Yakutia (Russia)","authors":"M. Usoltseva, L. Kopyrina, L. Titova, A. Morozov, A. Firsova, Y. Zakharova, M. Bashenkhaeva, M. Maslennikova, Y. Likhoshway","doi":"10.1080/0269249X.2020.1747551","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1747551","url":null,"abstract":"In the northern lakes of Yakutia, Vorota and Labynkyr, which are 2100 kilometres northeast of Lake Baikal, we found a putative Lake Baikal endemic, Lindavia minuta. Morphological analysis and non-metric multidimensional scaling showed that L. minuta populations from Yakutian and Transbaikalian lakes belong to the same (morpho) species. The possible dispersal history is discussed. The most probable hypothesis is that L. minuta was present in the Baikal basin during several Pleistocene glaciation cycles, and since Lake Baikal was previously connected to the River Lena, it is possible that there was a stable population of this species in the river, and that the river carried some cells to other suitable habitats. During glaciated periods, L. minuta could also have survived for longer periods in several ice dam lakes and possibly dispersed further north-east to the lakes in Yakutia.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1747551","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42128053","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 : 2020-04-02DOI: 10.1080/0269249X.2020.1772371
Yoshiki Sato, Eisuke Ono
A new fossil diatom species, Paralia kawasumii Sato sp. nov., has been found in upper Holocene coastal sediments of the central Ise Plain, central Japan. Detailed examination by light and scanning electron microscopy showed that P. kawasumii is a straight, chain-forming diatom characterized by double heterovalvy and spathulate linking spines. Like P. elliptica Garcia, its valve face is elliptical and undulate, and parallel and anastomosing ridges and grooves are present on sibling valve faces. Both species together comprise the ‘Paralia elliptica group’. However, P. kawasumii is considered a separate species from P. elliptica because of morphological differences in the structure and position of the rimoportulae and in the densities of fenestrae and of slits on the cingulum. Rimoportulae of P. kawasumii are perpendicular to the striae and distributed just below the overhanging mantle edge. Fenestrae and slits on the cingulum of P. kawasumii are more densely distributed than in P. elliptica. Paralia kawasumii is associated with loose sandy bottoms in intertidal areas (tidal flats to shallow outer bay environments). It is possible that P. kawasumii is an extant species, although no living cells have been found in surface sediments in Japan. If this were the case, P. kawasumii would be the fifth extant Paralia species in Japan.
在日本中部伊势平原中部全新世上海岸沉积物中发现了一种新的硅藻化石——Paralia kawasumii Sato sp. nov.。光镜和扫描电镜的详细检查表明，P. kawasumii是一种直的、链状形成的硅藻，具有双异瓣和匙形连接棘的特征。其瓣面与椭圆花瓣面相似，呈椭圆形起伏状，瓣面上有平行吻合的脊槽。这两个物种共同构成了“Paralia elliptica群”。然而，川草被认为是一个独立的物种，从椭圆草的结构和位置的形态差异，在窗的密度和狭缝的腰带。川川氏棱纹垂直于条纹，分布在地幔边缘的下方。川草带上的窗和狭缝比椭圆草分布更密。Paralia kawasumii与潮间带(潮滩到浅外湾环境)的松散砂质底部有关。虽然在日本的表层沉积物中还没有发现活细胞，但有可能p.t awasumii是一个现存的物种。如果是这样的话，P. kawasumii将是日本现存的第五个Paralia物种。
{"title":"Paralia kawasumii sp. nov., a new fossil Paralia species with an elliptical valve from upper Holocene coastal sediments of the central Ise Plain, central Japan","authors":"Yoshiki Sato, Eisuke Ono","doi":"10.1080/0269249X.2020.1772371","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1772371","url":null,"abstract":"A new fossil diatom species, Paralia kawasumii Sato sp. nov., has been found in upper Holocene coastal sediments of the central Ise Plain, central Japan. Detailed examination by light and scanning electron microscopy showed that P. kawasumii is a straight, chain-forming diatom characterized by double heterovalvy and spathulate linking spines. Like P. elliptica Garcia, its valve face is elliptical and undulate, and parallel and anastomosing ridges and grooves are present on sibling valve faces. Both species together comprise the ‘Paralia elliptica group’. However, P. kawasumii is considered a separate species from P. elliptica because of morphological differences in the structure and position of the rimoportulae and in the densities of fenestrae and of slits on the cingulum. Rimoportulae of P. kawasumii are perpendicular to the striae and distributed just below the overhanging mantle edge. Fenestrae and slits on the cingulum of P. kawasumii are more densely distributed than in P. elliptica. Paralia kawasumii is associated with loose sandy bottoms in intertidal areas (tidal flats to shallow outer bay environments). It is possible that P. kawasumii is an extant species, although no living cells have been found in surface sediments in Japan. If this were the case, P. kawasumii would be the fifth extant Paralia species in Japan.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1772371","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47356480","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 : 2020-04-02DOI: 10.1080/0269249X.2020.1737239
J. Kociolek, Nini Cui, QI Liu, S. Xie, Jia Feng, Jie Wang, Ying Shi
We present light and scanning electron microscope observations on two Neidium species, N. didelta and N. rectum, described by Friedrich Hustedt from Tibet. Neidium didelta and N. rectum have external proximal raphe ends that are deflected in opposite directions, as well as the presence of lacinia and renilimbi, all features of most members of the genus. Both species have a unique combination of characters. Internally, they have coverings over the longitudinal canals and areolae that are pluriseriate, much like the situation in the genus Neidiomorpha, and unlike other Neidium taxa. The areolae at the valve margin are larger than the other areolae comprising the striae. We compare these species with taxa described by Zhu & Chen, and suggest that these taxa are later synonyms of Hustedt’s species. We discuss the possible systematic affinities of these taxa within the Neidium and Neidiomorpha lineage.
{"title":"New and interesting diatoms from Tibet. III. Valve ultrastructure of two Neidium Pfitzer species from Tibet: comparison with other morphological groups of Neidium and consideration of phylogenetic relationships within the genus","authors":"J. Kociolek, Nini Cui, QI Liu, S. Xie, Jia Feng, Jie Wang, Ying Shi","doi":"10.1080/0269249X.2020.1737239","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1737239","url":null,"abstract":"We present light and scanning electron microscope observations on two Neidium species, N. didelta and N. rectum, described by Friedrich Hustedt from Tibet. Neidium didelta and N. rectum have external proximal raphe ends that are deflected in opposite directions, as well as the presence of lacinia and renilimbi, all features of most members of the genus. Both species have a unique combination of characters. Internally, they have coverings over the longitudinal canals and areolae that are pluriseriate, much like the situation in the genus Neidiomorpha, and unlike other Neidium taxa. The areolae at the valve margin are larger than the other areolae comprising the striae. We compare these species with taxa described by Zhu & Chen, and suggest that these taxa are later synonyms of Hustedt’s species. We discuss the possible systematic affinities of these taxa within the Neidium and Neidiomorpha lineage.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1737239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41816480","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 : 2020-04-02DOI: 10.1080/0269249X.2020.1761887
C. Lobban, C. Perez, M. Ashworth
In recent years the taxonomy of Haslea has been in flux. We describe several Haslea taxa from Guam, including four new species, in light of these recent findings. Four delicate, fusiform Haslea species are described from a variety of benthic habitats on coral reefs. These species, H. fusiformis comb. nov. and H. alexanderi, H. apoloniae and H. guahanensis spp. nov. are distinguished by stria density, foramen (‘areola’) shape, and cell size from each other and from similar taxa. A key to all these taxa is provided. In addition, an arcuate species is described as Haslea arculata sp. nov. The presence of a bilayered wall is shown for all these taxa. We compare the morphology of specimens reported as H. howeana from Guam with Navicula tsukamotoi, recently described from Okinawa, and with ‘Navicula cf. howeana’ from Puerto Rico. We provide the first account of the complex cingulum of N. tsukamotoi. We conclude that our specimens match N. tsukamotoi and that H. howeana should be returned to Navicula, but we leave open the question of conspecificity.
{"title":"Non-blue Haslea species (Bacillariophyceae: Naviculaceae) in the benthic marine flora of Guam (Mariana Islands, Western Pacific Ocean).","authors":"C. Lobban, C. Perez, M. Ashworth","doi":"10.1080/0269249X.2020.1761887","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1761887","url":null,"abstract":"In recent years the taxonomy of Haslea has been in flux. We describe several Haslea taxa from Guam, including four new species, in light of these recent findings. Four delicate, fusiform Haslea species are described from a variety of benthic habitats on coral reefs. These species, H. fusiformis comb. nov. and H. alexanderi, H. apoloniae and H. guahanensis spp. nov. are distinguished by stria density, foramen (‘areola’) shape, and cell size from each other and from similar taxa. A key to all these taxa is provided. In addition, an arcuate species is described as Haslea arculata sp. nov. The presence of a bilayered wall is shown for all these taxa. We compare the morphology of specimens reported as H. howeana from Guam with Navicula tsukamotoi, recently described from Okinawa, and with ‘Navicula cf. howeana’ from Puerto Rico. We provide the first account of the complex cingulum of N. tsukamotoi. We conclude that our specimens match N. tsukamotoi and that H. howeana should be returned to Navicula, but we leave open the question of conspecificity.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1761887","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44879471","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 : 2020-04-02DOI: 10.1080/0269249X.2020.1758794
D. Chudaev, I. Jüttner, A. Glushchenko, M. Kulikovskiy, S. Gurung, David M. Williams
Navicula nielsfogedii was recently described from tropical and sub-tropical Africa. New data on its distribution from several countries in Asia are provided in this paper, together with morphological observations and environmental information about the habitats where it was found. Since N. nielsfogedii was previously misidentified as Navicula heimansioides the morphology of both taxa is compared.
{"title":"On the geographical distribution of Navicula nielsfogedii J.C. Taylor & Cocquyt","authors":"D. Chudaev, I. Jüttner, A. Glushchenko, M. Kulikovskiy, S. Gurung, David M. Williams","doi":"10.1080/0269249X.2020.1758794","DOIUrl":"https://doi.org/10.1080/0269249X.2020.1758794","url":null,"abstract":"Navicula nielsfogedii was recently described from tropical and sub-tropical Africa. New data on its distribution from several countries in Asia are provided in this paper, together with morphological observations and environmental information about the habitats where it was found. Since N. nielsfogedii was previously misidentified as Navicula heimansioides the morphology of both taxa is compared.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249X.2020.1758794","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43645563","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 : 2020-01-02DOI: 10.1080/0269249x.2020.1726470
Yan Liu, J. Kociolek, Xinxin Lu, Yawen Fan
We present light and scanning electron microscope observations on a new species of the diatom genus Sellaphora, Sellaphora wangii Y.Liu & Kociolek, sp. nov., described from Hainan Island, China. This species has a raised conopeum with an axial groove or trough on either side of the axial area containing striae extending into the trough, and round depressions (i.e. pits) on the valve mantle at both apices. Our new species is distinctive and separated from other Sellaphora taxa by a unique combination of features that includes its valve outline, undulate raphe, and bow-tie shaped hymenes of the internal areola openings. The uncertainty and dynamic nature of the classification of Sellaphora prompted a review of the ultrastructural features found in species assigned to the genus. Based on this review, we identify four distinct groups of Sellaphora taxa organized by different combinations of ultrastructural features: stria structure, external and internal openings of the areolae, conopeum, polar bars, and apical pits. Based on the features present in our new species, it would be placed in the group that includes S. pupula, the generitype.
{"title":"A new Sellaphora Mereschkowsky species (Bacillariophyceae) from Hainan Island, China, with comments on the current state of the taxonomy and morphology of the genus","authors":"Yan Liu, J. Kociolek, Xinxin Lu, Yawen Fan","doi":"10.1080/0269249x.2020.1726470","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1726470","url":null,"abstract":"We present light and scanning electron microscope observations on a new species of the diatom genus Sellaphora, Sellaphora wangii Y.Liu & Kociolek, sp. nov., described from Hainan Island, China. This species has a raised conopeum with an axial groove or trough on either side of the axial area containing striae extending into the trough, and round depressions (i.e. pits) on the valve mantle at both apices. Our new species is distinctive and separated from other Sellaphora taxa by a unique combination of features that includes its valve outline, undulate raphe, and bow-tie shaped hymenes of the internal areola openings. The uncertainty and dynamic nature of the classification of Sellaphora prompted a review of the ultrastructural features found in species assigned to the genus. Based on this review, we identify four distinct groups of Sellaphora taxa organized by different combinations of ultrastructural features: stria structure, external and internal openings of the areolae, conopeum, polar bars, and apical pits. Based on the features present in our new species, it would be placed in the group that includes S. pupula, the generitype.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1726470","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41525559","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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