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NEW AND INTERESTING MAYAMAEA SPECIES (BACILLARIOPHYCEAE) FROM OSOGOVO
(Macedonian Academy of Sciences and Arts, 2026-02-11)
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Zaova, Dušica
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Observations of asample from a small spring on MountainOsogovo revealed the presence of several interesting and previously unknown small-celled diatom species. Among them, the genus Mayamaeashows relatively high diversi-ty, with at least eight species. Four species are presented in this study, two of which are described as new: Mayamaea matevskianasp. nov. and Mayamaea stafiloviiLevkov & Zaova sp. nov. Mayamaea matevskianais characterized by elliptical to elliptic-lanceolate valves, relatively coarse and strongly radiate striae, an indistinct central area bordered by more distantly positioned central striae, slightly expanded proximal raphe ends, and simple distal raphe ends. Maya-maea stafiloviihas a similar valve morphology and shape of the central area to M. matevskianabut differences can be observed in the valve size (which is considerably smaller than M. matevskiana) and the shape of the external distal ra-phe ends (which are long, slightly deflected, and extend onto the valve mantle). The new species are described based on detailed light and scanning electron microscopic observations.
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The Croatian National Diatom Collection – an overview and future challenges
(University of Zagreb, Faculty of Science, Department of Biology, 2025-05-08)
Ljubešić, Zrinka
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Jurina, Dunja
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Pavlović, Tin
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Živolić, Mario
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<jats:p>Knowledge of the importance of algae in the Earth's hydrosphere emerged after the discovery of the microscope and microorganisms at the beginning of the 18th century. Due to the beauty and morphological distinctiveness of diatoms, the majority of protist research has been focused on those intriguing silicate cells. Today, the vast species diversity of diatoms can only be estimated, but the taxa that have been explored over the years are stored in collections that represent an important resource for modern taxonomy, phylogeny and evolution, ecology, paleoecology, biogeography, phylogeography, applied biology, monitoring and conservation. The Croatian National Diatom Collection (HRNDC) was established in 2018 on the basis of long-term work by Croatian algologists. Today it represents a collection of 2883 permanent specimens that store valuable information on the diatom biodiversity of all waterbodies and store important holotypes, isotypes and paratypes of described new species for science. The future brings the challenge of keeping the collection sustainable, digitalized, and more accessible to the scientific community as well as capable of meeting the challenge of the omics era. The HRNDC is a priceless contribution to the legacy of the Croatian natural heritage.<jats:bold/></jats:p>
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The first freshwater Berkeleya (Bacillariophyceae) species - Berkeleya fluviatilis sp. nov. from the Krka River, Croatia
(Informa UK Limited, 2025-05-04)
Gligora Udovič, Marija
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Kulaš, Antonija
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Šušnjara, Mirela
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Jurina, Dunja
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Goreta, Gordana
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Two new Amphora species from European rivers compared to morphologically similar species of the Amphora copulata complex (Catenulaceae, Bacillariophyceae)
(Informa UK Limited, 2025-12-15)
Heudre, David
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Van de Vijver, Bart
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Werum, Marcus
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Lange-Bertalot, Horst
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Moreau, Laura
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Adding to Our Knowledge on the Diatom and Green Algae Biodiversity of Egypt: Some New-to-Science, Poorly Known, and Newly Recorded Species
(MDPI AG, 2025-02-05)
Saber, Abdullah A.
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El-Sheekh, Mostafa M.
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Salem, Olfat M. A.
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Cantonati, Marco
<jats:p>During our research on the diversity of diatoms and green microalgae from Egypt, four new-to-science, newly recorded, and poorly known species were retrieved from different Egyptian habitats. The new benthic diatom species Halamphora shaabanii A.A. Saber, El-Sheekh, Levkov, H. Saber et Cantonati sp. nov., which could not be identified using the currently available literature, was described from the high-conductivity, oasis lake Abu Nuss in the El-Farafra Oasis, located in the Western Desert of Egypt, employing both light (LM) and scanning electron (SEM) microscopy observations. A detailed comparison of the biometrically distinctive traits, and ecological preferences, of this new diatom species revealed sufficient differentiations from its morphologically most closely related species: H. atacamana, H. caribaea, H. ectorii, H. gasseae, H. halophila, H. mosensis, H. poianensis, and H. vantushpaensis. Ecologically, Halamphora shaabanii can tolerate relatively high nutrients (N and P) and prefers saline inland environments with NaCl water types. The araphid diatom Pseudostaurosiropsis geocollegarum was observed in the epilithic diatom assemblages of the River Nile Damietta Branch and identified on the basis of LM and SEM. From an ecological standpoint, P. geocollegarum seems to prefer elevated nutrient concentrations (meso-eutraphentic species), reflecting different human influences on the freshwater River Nile Damietta Branch. Based on the available literature, this is the first documentation of this freshwater diatom species for Egypt, and the second record for the African continent. Two green motile microalgae, Chlamydomonas proboscigera and Gonium pectorale, were isolated and identified from the terrestrial biomes of the arid habitat “Wadi El-Atshan” in the Eastern Desert of Egypt. C. proboscigera is reported herein for the first time in the Egyptian algal flora, while G. pectorale is poorly documented in the available literature. In light of our findings, the Egyptian habitats, particularly the isolated desert ecosystems, are interesting biodiversity hotspots and have a richer algal microflora than earlier anticipated. Furthermore, more in-depth taxonomic studies, using a combined polyphasic approach, are needed not only to foster our knowledge of the Egyptian and African algal and cyanobacterial diversity and biogeography, but also to be further used in applied environmental sciences.</jats:p>
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The Diatom Genus Navicula in Spring Ecosystems with the Description of Navicula aquaesuavis sp. nov
(MDPI AG, 2024-09-27)
Cid-Rodríguez, María
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Cantonati, Marco
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Angeli, Nicola
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Bilous, Olena
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Al-Harbi, Maha
Given the limited understanding of species diversity and ecological preferences of diatoms of the genus Navicula in spring ecosystems, herein we present and describe as species new to science, Navicula aquaesuavis Lange-Bert., Levkov, Cid-Rodríguez, A.A.Saber and Cantonati sp. nov. This species was collected from a mountain spring located above the tree line at 1613 m a.s.l. in the Northern Apennines. The Fontana del Vescovo (Bishop’s spring), which is the locus classicus of the new species, has a low conductivity (60–70 µS cm−1), temperature of ca. 5 °C, circumneutral pH (7.3–7.5), relatively low nitrate (ca. 1 mg L−1), and also suffered from a discharge reduction from 1 to 0.1 L s−1 from 2011 to 2023. The putative new species was confirmed by a second finding in Northern Macedonia, and we thoroughly document this second population as well. We seized the opportunity to describe this new Navicula and review the global literature on the diatom genus Navicula in spring ecosystems. Using the results of this review and our own databases on springs and wells in central Europe and Egypt, we discuss the main Navicula species and their environmental preferences in spring habitats.
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Species of the genus Gomphonema from Haqlan hot springs, Iraq, with the description of two new species
(Informa UK Limited, 2024-12-03)
Al-Handal, Adil Y.
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Abdullah, Huda
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Wulff, Angela
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Species of the genus Gomphonema from Haqlan hot springs, Iraq, with the description of two new species
(Informa UK Limited, 2024-12-03)
Al-Handal, Adil Y.
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Abdullah, Huda
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Wulff, Angela
This work presents a systematic account of the species of Gomphonema in Haqlan hot springs, Iraq. In diatom-rich material epiphytic on the aquatic plant Najas minor, 11 species belonging to Gomphonema were encountered, including two species new to science: G. brockiae sp. nov. and G. hadithaensis sp. nov. These species were described based on light and electron microscope observations. Gomphonema brockiae is a thermophilic and halophilic species, differentiated from its allied taxa by valve morphology and ultrastructure, including valve outline and size, stria density and areola shape. Gomphonema hadithaensis is characterized by its naviculoid shape and large size but can be distinguished from related taxa by its length/width ratio as well as stria density. A detailed morphological description of valve ultrastructure is provided for all species in this work. Eight of the currently identified Gomphonema species are new records for Iraq. This work is a documentation of diatoms present in a rapidly changing habitat due to severe shortage of freshwater supply to Iraq.
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The geodynamic and limnological evolution of Balkan Lake Ohrid, possibly the oldest extant lake in Europe
(Wiley, 2022-10-31)
Wagner, Bernd
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Tauber, Paul
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Francke, Alexander
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Leicher, Niklas
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Binnie, Steven A.
<jats:p>Studies of the upper 447 m of the DEEP site sediment succession from central Lake Ohrid, Balkan Peninsula, North Macedonia and Albania provided important insights into the regional climate history and evolutionary dynamics since permanent lacustrine conditions established at 1.36 million years ago (Ma). This paper focuses on the entire 584‐m‐long DEEP sediment succession and a comparison to a 197‐m‐long sediment succession from the Pestani site ~5 km to the east in the lake, where drilling ended close to the bedrock, to unravel the earliest history of Lake Ohrid and its basin development. <jats:sup>26</jats:sup>Al/<jats:sup>10</jats:sup>Be dating of clasts from the base of the DEEP sediment succession implies that the sedimentation in the modern basin started at <jats:italic>c</jats:italic>. 2 Ma. Geophysical, sedimentological and micropalaeontological data allow for chronological information to be transposed from the DEEP to the Pestani succession. Fluvial conditions, slack water conditions, peat formation and/or complete desiccation prevailed at the DEEP and Pestani sites until 1.36 and 1.21 Ma, respectively, before a larger lake extended over both sites. Activation of karst aquifers to the east probably by tectonic activity and a potential existence of neighbouring Lake Prespa supported filling of Lake Ohrid. The lake deepened gradually, with a relatively constant vertical displacement rate of ~0.2 mm a<jats:sup>−1</jats:sup> between the central and the eastern lateral basin and with greater water depth presumably during interglacial periods. Although the dynamic environment characterized by local processes and the fragmentary chronology of the basal sediment successions from both sites hamper palaeoclimatic significance prior to the existence of a larger lake, the new data provide an unprecedented and detailed picture of the geodynamic evolution of the basin and lake that is Europe’s presumed oldest extant freshwater lake.</jats:p>
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A new small-celled naviculoid diatom species,Mayamaea pannonica sp. nov. (Bacillariophyceae) from soda pans in Serbia
(Informa UK Limited, 2023-04-21)
Vidaković, Danijela
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Krizmanić, Jelena
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Beszteri, Bank
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Gavrilović, Bojan

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