Fottea, 2022 (vol. 22), issue 2
Original article
Humidophila manipurensis sp. nov. and the first record of Humidophila bigibba (Hustedt) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot et Kopalová from Northeast India
Murugesan Yogeshwaran, Cheran Radhakrishnan, Atul Dwivedi, J. Patrick Kociolek, Balasubramanian Karthick
Fottea 2022, 22(2):162-170 | DOI: 10.5507/fot.2022.001 
A new aerophilic diatom species, Humidophila manipurensis sp. nov., is described from the Sadu Chiru waterfalls, Manipur, India, a part of the Indo-Burma hotspot region. This species is characterized by having its valve shape slightly inflated at middle, terminal raphe ends that are slightly deflected, round areolae and a central depression. Further, we also recorded Humidophila bigibba from Meghalaya State, Northeast India, and this population is compared with the type population from Indonesia and Chinese populations. Fine structural details of both taxa were examined using light and scanning electron microscopy and compared...
Four new species of the genus Lacustriella (Bacillariophyta) from Lake Baikal
Yelena Rodionova, Galina Pomazkina, Tatyana Sherbakova
Fottea 2022, 22(2):171-180 | DOI: 10.5507/fot.2022.002
We add four new species to the recently established genus Lacustriella Kulikovskiy, Lange-Bertalot et Metzeltin and characterize morphology of the taxa based on LM and SEM observations. Lacustriella cuspidata, L. rombea, L. radiata and L. solita share all of the typical morphological features of the genus including longitudinal canal along each valve margin, radiate uniseriate striae terminated with large elongated areolae, and external distant raphe ends bent oppositely. L. cuspidata is peculiar among the other Lacustriella with rows of small pores look as if they continue striae on the...
Resurrection of the diatom genus Stephanocyclus (Coscinodiscophyceae: Stephanodiscaceae) on the basis of an integrated molecular and morphological approach
Maxim Kulikovskiy, Sergei Genkal, Yevhen Maltsev, Anton Glushchenko, Irina Kuznetsova, Dmitry Kapustin, Evgeniy Gusev, Nikita Martynenko, John Patrick Kociolek
Fottea 2022, 22(2):181-191 | DOI: 10.5507/fot.2021.025
The history of the description and subsequent consideration of the diatom genus Stephanocyclus Skabitschevsky (Thalassiosirales, Bacillariophyta) is discussed. The new genus was described on the basis of a new species, S. planum Skabitschevsky, originally collected from the River Ob. However, the genus has been more or less forgotten since its initial description in 1975. Type material from Skabitschevsky's collection has subsequently been lost. An epitype for this species is recognized from the same region as the original collection, and typified with a population from Lake Baikal and using molecular data. The population from Lake Baikal...
The novel marine cyanobacterium Nunduva sanctimaloensis sp. nov. (Nostocales, Cyanobacteria) from rocky shores and its reproduction through modified monocytes
David E. Berthold, Vera R. Werner, Forrest W. Lefler, Isabella P. Simon, H. Dail Laughinghouse IV
Fottea 2022, 22(2):192-203 | DOI: 10.5507/fot.2021.023
Rocky intertidal regions are diverse as they provide many unique habitats for the growth of cyanobacteria. From outcrops battered by waves, tidal pools, and periods of desiccations due to tides, these regions offer distinct environments and much of their cyanobacterial diversity remains unexplored. To help elucidate cyanobacteria from this habitat, one nostocalean cyanobacterium from Brittany, France was isolated and cultured. Typical morphological features including filaments with heteropolar trichomes, basal or intercalary heterocytes, false branching, and long hyaline apical hairs suggested the genus Nunduva. The combination of 16S rRNA gene...
Vladinikolaevia, gen. nov. - a new enigmatic freshwater diatom genus (Cymbellaceae; Bacillariophyceae) from Mongolia
Maxim Kulikovskiy, John Patrick Kociolek, Yan Liu, Irina Kuznetsova, Anton Glushchenko
Fottea 2022, 22(2):204-210 | DOI: 10.5507/fot.2021.022
We studied a new freshwater cymbelloid diatom taxon collected from Mongolia with light and scanning electron microscopy. The monotypic genus Vladinikolaevia gen. nov., based on V. mongolica sp. nov, is described. The new genus is characterized by a combination of morphological features found in two well-known genera such as Cymbella and Encyonema. The raphe system is morphologically-similar to Encyonema but the presence of apical pore fields is similar to the genus Cymbella as presently circumscribed. There are other very interesting peculiarities found in V. mongolica sp. nov. that show it to...
Navicula similecataracta-rheni sp. nov. and N. aquitanonipponica sp. nov. (Bacillariophyta), two new species from Nouvelle-Aquitaine, Southwestern France - comparison with the related species N. cataracta-rheni Lange-Bertalot, N. cryptotenella Lange-Bertalot and N. sancti-naumii Levko et Metzeltin
Delphine Sagnet, Bart Van de Vijver, Loïc Tudesque
Fottea 2022, 22(2):211-227 | DOI: 10.5507/fot.2022.007
Navicula similecataracta-rheni and N. aquitanonipponica are two new Navicula species recorded from the Nouvelle Aquitaine Region, southwestern France. Both new species belong to the linear-lanceolate Navicula species complex. A detailed iconography based on light and scanning microscopy observations is given for the type and complementary populations. Comparisons with close related species based both on literature and on microscope observations, particularly with N. cryptotenella, N. cataracta-rheni and Navicula sancti-naumii, support the erection of the two new species.
New chrysophyte stomatocysts from high mountain lakes in Three Parallel Rivers of Yunnan Protected Areas, China
Wanting Pang, Bart Van de Vijver, Han Wu, Yanling Li
Fottea 2022, 22(2):228-237 | DOI: 10.5507/fot.2022.004
During a survey of the chrysophyte stomatocyst flora in surface sediments of 34 lakes in Three Parallel Rivers of Yunnan Protected Areas, 14 new stomatocysts were observed. These new cysts were described based on scanning electron microscopy (SEM) observations. Their morphology was compared with the most similar morphotypes worldwide. The obtained records improve our knowledge on the stomatocyst diversity in low latitude high mountain lakes of the world.
A new freshwater species Conticribra sinica (Thalassiosirales, Bacillariophyta) from the lower reaches of the Yangtze River, China
Pan Yu, Lin Yang, Qingmin You, Yonghong Bi, Quanxi Wang
Fottea 2022, 22(2):238-255 | DOI: 10.5507/fot.2021.024
A new freshwater diatom species Conticribra sinica sp. nov. Yu, You et Wang from three lakes in the lower reaches of the Yangtze River, China, is described here using a combination of morphological and molecular data from ribosomal DNA genes. The primary distinguishing characteristic of C. sinica was the presence of a non-plicate or slightly-plicate valve face and a single ring marginal fultoportulae that was located at the junction between the valve face and the mantle. There were 4-11 valve face fultoportulae that were located at the subcenter of the valve face. In addition, a single rimoportula replaced a marginal fultoportulae. Areolae...
Fragilaria radians (Kützing) D.M.Williams et Round, the correct name for F. gracilis (Fragilariaceae, Bacillariophyta): a critical analysis of this species complex in Europe
Bart Van de Vijver, David M. Williams, Wolf-Henning Kusber, Marco Cantonati, Paul B. Hamilton, Carlos E. Wetzel, Luc Ector
Fottea 2022, 22(2):256-291 | DOI: 10.5507/fot.2022.006
Fragilaria gracilis is one of the most reported Fragilaria species in Europe, observed in a broad range of water bodies, ranging from (ultra)oligotrophic rivers to even eutrophic lakes. A revision of this important taxon based on the analysis of the morphology of a large number of historic and recent populations was highly needed. In the present study, type material of Fragilaria gracilis and several related taxa such as Synedra radians, Fragilaria pseudolaevissima, S. utermoehlii, F. aquaplus, F. boreomongolica and F. tridentina together with more than 10 modern populations were...
Review
Diatoms with studied sexual reproduction
Nickolai Davidovich, Olga Davidovich
Fottea 2022, 22(2):292-296 | DOI: 10.5507/fot.2022.003
Diatoms (Bacillariophyta) are unicellular organisms with extremely high species diversity. According to AlgaeBase, the names of approximately 17 thousand species are currently considered to be taxonomically accepted. It is assumed that there are about 100,000 species of diatoms on the planet. Sexual reproduction is an obligatory stage of the life cycle in many diatoms due to specific structure of their frustules and the mode of reduction and restoration of the latter. At the same time, analysis of literature showed that over the entire three-century history of the study, data (in some cases very incomplete) have been accumulated on the sexual reproduction...