Evgeniy Gusev

• Diplom
• Russian Academy of Sciences

Bacterial antibiotic resistance represents a major healthcare problem. In 2019, 4.95 million deaths were associated with antibiotic resistance, and it is estimated that, by 2050, up to 3.8% of the global gross domestic product could be lost due to this problem. Methicillin-resistant Staphylococcus aureus is one of the leading sources of hospital-ac...

In this paper, we describe two new species of the genus Cryptomonas from Cat Tien National Park (Vietnam): Cryptomonas pascheri and Cryptomonas playfairii, based on morphological characteristics and molecular analysis of the 18S, 28S, ITS2 rDNA and psb A cpDNA regions. The concept of compensatory base substitutions (CBCs) was also used for delimiti...

This research is devoted to the study of the Mallomonas mangofera species complex in a tropical region using electron microscopy and molecular methods. Based on a study of nine algal cultures belonging to the Mallomonas mangofera morphotype, two new clades were identified based on the SSU rDNA + rbcL cpDNA and ITS1-5.8S-ITS2 rDNA datasets. Two new...

A new species of the genus Mallomonas from Viet Nam is described in this paper. The description was based on the scale morphology, which was studied using scanning and transmission electron microscopy. The new species, Mallomonas arenosa sp. nov., was characterized by small rhombic scales with a small dome, rectangular or polygonal reticulation on...

The ultrastructure of the silica scales and bristles of two morphologically similar taxa, Mallomonas multiunca var. multiunca and M. multiunca var. pocosinensis, was compared. Based on the revealed differences in the morphology of scales and bristles, the taxonomic status of the species M. multiunca var. pocosinensis was revised and a new taxonomic...

This paper describes a new species of Mallomonas discovered in a swamp area in Russia. The species was identified based on scale morphology, examined using scanning and transmission electron microscopy, and subjected to molecular analysis. The new species, Mallomonas okhapkinii sp. nov., belongs to the section Planae and is most similar in scale an...

Strains of Mallomonas favosa f. favosa and Mallomonas favosa f. gemina from Vietnam have been studied. Their phylogenetic position was revealed using the SSU rDNA + rbcL cpDNA dataset. The ultrastructure of the scales and bristles was studied using transmission and scanning electron microscopy. A new combination was proposed: Mallomonas gemina comb...

Strains of Mallomonas mangofera var. mangofera and M. mangofera var. foveata from Russia and Vietnam were studied. Their phylogenetic position was revealed using the SSU rDNA + rbcL cpDNA dataset. The ultrastructure of scales and bristles was studied using transmission and scanning electron microscopy. Based on these studies, a new combination was...

This paper describes a new species of Mallomonas, discovered in small ephemeral waterbodies of Southern Urals (Russia). The species description is based on scale morphology studied using scanning and transmission electron microscopy. Mallomonas uralensis sp. nov. belongs in section Torquatae and is most similar to representatives of the series Mang...

A new species, Mallomonas doanii sp. nov, is described from Vietnam based on the morphology of silica scales and bristles observed using transmission electron microscopy (TEM). Scales of M. doanii were found in six localities in four provinces of Vietnam. The species belongs to the section Ouradiotae. The scales of the new species are small in size...

Search for novel best-performing starter feed ingredients is one of the main challenges of modern aquaculture industry. The goal of this article is to evaluate the effect of microalgae supplementation enriched with omega-3 polyunsaturated eicosapentaenoic acid and the powerful antioxidant fucoxanthin on growth performance of Red tilapia fry (Oreoch...

A new species Mallomonas limbata sp. nov. is described from Vietnam. The description is based on silica-scale morphology studied by means TEM and SEM. The species belongs to the section Planae and has a similar morphology with species from the Mallomonas matvienkoae complex. New species has ovoid scales, narrowed distally, a developed secondary sil...

A new species, Mallomonas rimosa sp. nov., is described from Vietnam based on silica-scale morphology observed using scanning and transmission electron microscopy. Mallomonas rimosa belongs to section Torquatae and is most similar to M. eoa, M. prora, M. serrata, M. scrobiculata, M. pumilio var. dispersa, M. caverna, and M. lanalhuensis. The main d...

This paper is devoted to the study of the flora of silica-scaled chrysophytes in water bodies of the steppe zone of the Southern Urals (Russia). Twenty-four taxa were identified via scanning and transmission electron microscopy, twenty of which are representatives of the genus Mallomonas Perty, while four are species of the genus Synura Ehrenberg....

Search for novel best-performing starter feed ingredients is one of the main challenges of modern aquaculture industry. The goal of this article was to evaluate the effect of microalgae supplementation enriched with omega-3 polyunsaturated eicosapentaenoic acid and powerful antioxidant fucoxanthin on grows and performance of Red tilapia fry ( Oreoc...

A new species, Mallomonas acidophila sp. nov., is described from Vietnam based on silica-scale morphology observed using scanning and transmission electron microscopy. Mallomonas acidophila belongs to section Papillosae and is most similar to M. preisigii, described from fossil deposits. Scales of Mallomonas acidophila have a shallow elongated dome...

In mountain regions, biological soil crusts (BSCs) provide essential ecological services by being involved in primary production and nitrogen fixation. Eukaryotic algae and cyanobacteria are important photosynthetic components of these unique cryptogamic communities. Here, we present an overview of the eukaryotic and prokaryotic diversity of such p...

Mallomonas pseudocorymbosa sp. nov. was described from Vietnam based on silica-scale morphology studied by transmission and scanning electron microscopy. This species belongs to the section Mallomonas. The distribution and habitat conditions of the new species were summarised. Mallomonas pseudocorymbosa was found in 17 localities in 13 provinces in...

This paper presents an annotated list of the Mallomonas and Synura taxa (order Synurales, class Chrysophyceae) found in Viet Nam. This list is based on materials from long-term studies (from 2008 to 2020) of 371 freshwater localities in 18 provinces in the country. A total of 67 taxa (morphotypes) of the genus Mallomonas and 7 of the genus Synura w...

Mallomonas fragariformis sp. nov. is described from Viet Nam based on silica-scale morphology studied by means of transmission and scanning electron microscopy. This species belongs to the Mallomonas mangofera species complex and is characterized by small scales ornamented with large papillae placed in shallow pits and stout four-edged serrated spi...

A new species of green coccoid algae, Mychonastes hindakii sp. nov., was isolated from the River Moscow (Russia, Moscow). The taxon is described using morphological and molecular methods. Mychonastes hindakii sp. nov. belongs to the group of species of the genus Mychonastes with spherical single cells joined with mucilaginous, irregularly shaped st...

The silica-scaled chrysophyte flora of some lakes and rivers of the Altai Mountains was investigated by means of electron microscopy. Teletskoye Lake; the Biya, Chulyshman, and Katun Rivers; and small lakes around the area were studied. A total of sixteen taxa were recorded, including eight belonging to Mallomonas, five to Synura, and three to Para...

A new species, Cryptomonas tropica sp. nov., is described from Cat Tien National Park (Vietnam) based on morphological and molecular data. Strains of the new species were isolated from soil, which is an unusual environment for photosynthetic cryptomonads. This species has elliptical cells in ventral view and a single plastid notched into several ir...

The present paper focuses on the silica-scaled chrysophytes from two tropical islands: Con Son (Con Dao Archipelago) and Phu Quoc, located in Viet Nam. Electron microscopy revealed fifty-seven taxa, of which forty-one belong to the genus Mallomonas. The others are species of the genera Synura (5), Paraphysomonas (8), Spiniferomonas (1), Chrysosphae...

The silica-scaled chrysophyte flora from Indonesian Papua was investigated by means of electron microscopy. A total of twenty-four taxa were recorded, including five belonging to Paraphysomonas, one to Chrysosphaerella, one to Spiniferomonas, fifteen to Mallomonas and two to Synura. Thirteen taxa were recorded for the first time in Indonesia. Compa...

A new cyanobacterial species of Aliinostoc, A. vietnamicum sp. nov., is recorded in the tropical forest soil from the Cát Tiên National Park, Vietnam. The analysis is based on morphological characters, 16S rDNA phylogeny, ITS secondary structure, and fatty acid composition analysis. A. vietnamicum differed from the other species of the genus by the...

Molecular data were used to revise the diversity of the genus Cryptomonas in Russia, using samples collected across nine geographic regions within Russia from 2015–2019. Several molecular markers were used: nuclear SSU, LSU and ITS2 rDNA, and plastid psbA. In total, 24 species of the genus Cryptomonas were identified in the country’s fresh waters b...

In this study, the cryptomonads of the northern territories of Russia were explored. Four strains were isolated from the different acidic habitats in the Middle Urals and the North of the European part of Russia. Cells of these strains are flattened in the dorsoventral plane, have an asymmetrical outline and are similar in size and shape to Cryptom...

Mallomonas voloshkoae sp. nov. was described from Russia based on silica-scale morphology studied by means of transmission and scanning electron microscopy. This species belongs to the section Striatae and is characterised by scales with wide anterior flanges, forming wing-like extensions. This species is most similar in scale ultrastructure to M....

A new species of tropical chrysophyte algae, Mallomonas lusca sp. nov. is described from Vietnam based on silica-scale morphology observed using scanning and transmission electron microscopy. Scales of this species were previously found in Malaysia, but had not yet been described. Mallomonas lusca belongs to section Torquatae and is most similar to...

This paper focuses on the flora of scale-bearing chrysophytes from eight provinces located in the central part of Vietnam. Khanh Hoa, Phu Yen, Binh Dinh, Thua Thien Hue, Quang Tri, and Quang Binh provinces are located in the coastal area of Vietnam. Lam Dong and Dak Lak provinces represent mountain territories with an elevation of 500–2000 metres a...

A new monoraphid diatom species Achnanthidium gladius sp. nov. is described from Indonesia. The description is based on molecular data (18SV4), morphological analysis and comparison with similar species. According to molecular data, Achnanthidium gladius sp. nov. is closely related to Achnanthidium minutissimum. Morphologically, the new species dif...

The present paper focuses on the flora of synuralean algae from four northern provinces in Vietnam: Bac Kan, Hanoi, Ninh Binh, and Thanh Hoa. Fifty-five water bodies were studied, including territories within national parks Ba Be, Ba Vi, Cuc Phuong, Ben En, and Trang An Wetland—The World Cultural and Natural Heritage and Van Long Wetland Nature Res...

Using genetic markers 18S V4 rDNA and rbcL and morphological investigation of the diatom genus Placoneis, we described three new species. The new species, Placoneis baikaloelginensis sp. nov., Placoneis subundulata sp. nov., Placoneis neohambergii sp. nov. were isolated from Russia (Lake Baikal) and Vietnam (waterbodies of Cát Tiên National Park (Đ...

A new cymbelloid diatom species from the genus Cymbopleura (Krammer) Krammer is described on the basis of molecular and morphological investigations. Cymbopleura natellia Glushchenko, Kulikovskiy & Kociolek, sp. nov. is, on the basis of results with molecular data, close to C. naviculiformis (Auerswald ex Heiberg) Krammer. The two species differ bo...

A new species, Cryptomonas indica sp. nov., is described from Western Ghats, India, based on morphological and molecular data. Phylogenetic relationships inferred from nuclear small and large subunit ribosomal DNA, internal transcribed spacer 2, and plastid psbA sequences show that the new species forms a separate lineage on the phylogenetic tree o...

We present the results of the first ever research on biodiversity and biogeography of marine benthic diatoms from coral reefs of the tropical islands of Indonesia, including West Borneo, East Java, South Celebes, Komodo, Rinca and Flores. The sampled islands offer a broad range of coral reef microhabitats and host diatom assemblages from seaweeds,...

A new species, Mallomonas loricata sp. nov., is described from Vietnam based on silica-scale morphology studied using transmission and scanning electron microscopy. The species belongs to section Planae and has similar morphology to species from the Mallomonas matvienkoae complex. The new species is characterized by obovoid scales with a thick seco...

A new species, Mallomonas vietnamica Gusev, Kezlya & Tran, sp. nov., is described from Vietnam based on silica-scale morphology elucidated by transmission and scanning electron microscopies. The species belongs in section Mallomonas Perty and is characterized by large oval scales with a wide and deep dome, which is recessed from the scale perimeter...

This paper describes a new species from the Class Chlorophyceae, Mychonastes frigidus sp. nov., isolated from a cold-water mountain stream in the north of Russia (Subpolar Ural). The taxon is described using morphological and molecular methods. Mychonastes frigidus sp. nov. belongs to the group of species of the genus Mychonastes with spherical sin...

Diatoms from soil ecosystems in Vietnam are almost unknown. From soils was isolated 281 strains. Was found 15 genus and 78 species. Our findings provide new information about the soils diatoms in Vietnam.

The genus Phycopeltis comprises filamentous to pseudoparenchymatous green algae which grow on the leaves, stems and fruits of higher plants. The genus occurs mainly in tropical and subtropical areas. Up to now Phycopeltis has not been recorded from Vietnam. During the phycological investigations in Cat Tien National Park we recorded the species of...

The report presents the results of a study of algae in forest soils in the Cat Tien National Park (South Vietnam) using 7 model sites as an example. The species composition of algae and their vertical distribution in the soil horizons have been characterized.

Desmids are a large polyphyletic group of streptophyte algae, numbering about 4000 species. Traditionally, the taxonomy of desmids is based on morphological characters. However, the latest molecular genetic studies of the group conflict with the established taxonomy and indicate the polyphyletic position of some genera of this group of algae. The g...

The paper presents the preliminary data on the diversity of cryptomonad in the tropics (Vietnam and India). Isolation of algae into culture (more than 200 strains) and their study using molecular methods made it possible to reveal the rich flora of the genus Cryptomonas, consisting of 51 species (statistically supported clades).

We investigated the silica-scaled chrysophyte flora from the Ukrainian Polissia by means of electron microscopy. Overall, 49 taxa were recorded, including three species each of Chrysosphaerella Lauterborn and Paraphysomonas De Saedeleer emend. Scoble & Cavalier-Smith, one unidentified Lepidochromonas Kristiansen taxon, two Spiniferomonas E.Takahash...

Two new species, Mallomonas punctostriata sp. nov. and Mallomonas collucata sp. nov., are described from Vietnam based on silica-scale morphology studied by means of transmission and scanning electron microscopy. Both species inhabits swamp areas. Mallomonas punctostriata belongs to section Striatae. Its scales have unique transverse rows, consisti...

A new species from the genus Placoneis (Bacillariophyceae: Cymbellales) is described on the basis molecular and morphological data. Placoneis cattiensis Glushchenko, Kezlya, Kulikovskiy & Kociolek sp. nov. is described from soil collected from the bottom of a dry, temporary stream in the forest of Сát Tiên National Park in Vietnam. On the basis of...

Molecular investigation of genera Nupela and Brachysira is conducted using strains from Indonesia and Vietnam. New species from the genus Nupela indonesica sp. nov. is described using combined approach. Nupela lesothensis (Schoeman) Lange-Bertalot is investigated using molecular data too. Phylogenetic analysis shows that Nupela and Brachysira are n...

A new species from Vietnam, Cryptomonas vietnamica sp. nov., is described based on morphological and molecular data. Six strains from different habitats were analyzed. Cryptomonas vietnamica is characterized by large cells up to 54 µm long, 30 µm wide and 20 µm thick, flattened in dorso-ventral plane and often twisted. Phylogenetic relationships in...

A new diatom genus, Gogorevia, is described on the basis of an integrated molecular and 22 morphological investigation. Two species are described from Vietnam the generitype, G. rinatii sp. nov. and G. ovalis sp. nov. These species share many of the same morphological features with Achnanthes exigua and allied taxa that were previously transferred...

Raphidiopsis raciborskii is a freshwater, potentially toxigenic cyanobacterium, originally described as a tropical species that is spreading to northern regions over several decades. The ability of R. raciborskii to produce cyanotoxins – in particular the alkaloid cylindrospermopsin (CYN), which is toxic to humans and animals – is of serious concer...

A new diatom genus, Gogorevia, is described on the basis of an integrated molecular and morphological investigation. Two species are described from Vietnam the generitype, G. rinatii sp. nov. and G. ovalis sp. nov. These species share many of the same morphological features with Achnanthes exigua and allied taxa that were previously transferred to...

A new species, Cryptomonas cattiensis sp. nov., is described from Vietnam based on morphological and molecular data. Phylogenetic relationships inferred from nuclear small and large subunit ribosomal DNA, internal transcribed spacer 2, and plastid psbA sequences show that the new species forms a separate branch on the phylogenetic tree of the genus...

The species diversity, distribution, and morphological features of centrohelid heliozoans (Centroplasthelida) (Haptista: Centroplasthelida Febvre-Chevalier et Febvre, 1984) from freshwaters of Central and Southern Vietnam have been studied using scanning electron microscopy (SEM). Twelve species, belonging to Acanthocystidae, Choanocystidae, Pteroc...

This paper presents the first data on the flora of silica-scaled chrysophytes (orders Synurales and Paraphysomonadales) in the delta of the Mekong River (Vietnam). A total of 15 taxa have been identified: nine from the genus Mallomonas, one from Synura, and five from Paraphysomonas. Six taxa are reported for the first time from Vietnam. At most sit...

Приведены первые данные о флоре золотистых водорослей из порядков Synurales, Paraphysomonadales. Выявлено 15 таксонов, из них 9 рода Mallomonas, 1 – рода Synura, 5 родa Paraphysomonas. Шесть таксонов впервые отмечены во Вьетнаме. Распределение найденных таксонов по станциям было неравномерным, чаще всего присутствовало по одному-два вида. Наибольше...

# Deceased. Cryptophyte algae belong to a special group of oxygenic photosynthetic organisms containing pigment combination unique for plastids - phycobiliproteins and chlorophyll a/c-containing antenna. Despite the progress in investigation of morphological and ecological features, as well as genome-based systematics of cryptophytes, their photosy...

A new species, Cryptomonas uralensis Martynenko, Gusev, Kulizin & Guseva sp. nov., is described from western slopes of the Ural Mountains (Russia) based on morphological and molecular data. Phylogenetic relationships inferred from nuclear SSU and LSU rDNA sequences show that the new species forms a clade with C. tetrapyrenoidosa Skuja emend. Hoef-E...

A novel tri-unsaturated C25 highly branched isoprenoid (HBI) alkene has been identified in a laboratory culture of the diatom Navicula salinicola and its structure determined using a combination of NMR spectroscopy and gas chromatography–mass spectrometry (GC–MS). This represents the first report of a C25 HBI in a marine diatom from the Navicula ge...

Four species of Gomphonema described by Hustedt with fusiform valve shape are studied for the first time using SEM. G. longissimum Hustedt, G. angustissimum Hustedt, G. woltereckii Hustedt and G. subtiliforme Hustedt were described, and are known only, from the ancient Malili lake system in Indonesia. Molecular investigations of two cultured strain...

A new species Mallomonas lamii sp. nov. is described from Vietnam based on silica-scale morphology studied by means of transmission and scanning electron microscopies. The species belongs to the Mallomonas matvienkoae complex and is characterized by large oval scales with a thick secondary layer with internal reticulation that covers the distal one...

Diatoms (Bacillariophyta) are ubiquitous microalgae which produce a siliceous exoskeleton and which make a major contribution to the productivity of oceans and freshwaters. They display a huge diversity, which makes them excellent ecological indicators of aquatic ecosystems. Usually, diatoms are identified using characteristics of their exoskeleton...

Mallomonas gusakovii sp. nov. is described from Vietnam based on silica-scale morphology studied by means of transmission and scanning electron microscopy. This species belongs to section Quadratae and is characterized by large and broad scales of three types with an internal reticulation, V-shaped rib and a forward projecting wing. Different types...

This paper describes the new species Mallomonas papuensis from a small bog pool in Papua province, Indonesia. The description is based on silica-scale morphology studied by means of transmission and scanning electron microscopy. The cells of Mallomonas papuensis are covered by three types of scales: asymmetric collar scales with forward projecting...

The genus Mallomonas was investigated during 2012-2015 in three small rivers in Nizhniy Novgorod (Central Russia): Chyornaya, Levinka and Rzhavka. In total, thirty-six taxa have been recorded, including three varieties and one forma. Eight taxa are new for Russia: M. fuegiana Vigna & Kristiansen, M. kalinae Řezáčová, M. labyrinthina K.H. Nicholls,...

The present paper focuses on the silica-scaled chrysophytes from the Cam Ranh Peninsula (Vietnam). Electron microscopy revealed thirty-six taxa, of which twenty-nine belong to the genus Mallomonas. The others are species of the genera Synura (4), Spiniferomonas (1), Chrysosphaerella (1) and Paraphysomonas (1). Seven taxa are reported for the fi rst...

Type material of Navicula kotschyi was studied, and this species was transferred to Dorofeyukea gen. nov. as D. kotschyi comb. nov. Dorofeyukea was described on the basis of DNA sequence and morphological data. Additional species assigned to this genus that were previously included in Navicula include: D. ancisa comb. nov., D. grimmei comb. nov., D...

Silica-scaled chrysophytes of Indonesia are scarcely known. An investigation of seven lakes in West Java revealed nineteen species of silica-scaled chrysophytes; three species (Mallomonas tonsurata, Mallomonas splendens and Spiniferomonas trioralis) have previously been reported from Indonesian freshwaters, while the other sixteen species are recor...

A new species, Sellaphora balashovae sp. nov., from Lake Frolikha is described based on light (LM) and scanning electron microscopy (SEM). The systematic position of this new species is determined based on molecular data. This species is placed in the genus Sellaphora based on chloroplast morphology, areolae covered by external hymenes, and uniseri...

Manipulation of the nutrient concentration is an inexpensive and efficient method for increasing lipid and TAG accumulation in algal cells. However, high volumetric production requires finding a proper balance between the decrease of biomass production and the increase in the total lipid content. We isolated a strain of green microalga Bracteacoccu...

The new species Parietochloris grandis sp. nov. is described from forest soil in the Dnipropetrovsk region, Ukraine. The description is based on morphological features and the phylogenetic analysis of partial SSU rDNA and rbcL genes. Phylogenetic analysis places P. grandis in the Parietochloris clade, within the family Trebouxiophyceae. The novel s...

The two-celled colonial synurophyte genus Chrysodidymus was originally distinguished from its close relative Synura on the basis of the colonies always being of two cells, the shape of the cells and the odd swimming nature of the colony. Recently, based on gene sequence data, Chrysodidymus was found to be deeply nested within the Synura clade. As a...

The present paper focuses on flora of silica-scaled chrysophytes from Cat Tien National Park (Vietnam). The use of electron microscopy technique allowed for the discovery of 42 taxa found in reservoirs, lakes, bogs and temporary ponds in the forest. Thirty-six taxa belong to the genus Mallomonas, among them 29 species and seven infraspecific taxa....

A complex of closely related Mallomonas taxa belonging to the section Papillosae, M. kalinae Řezáčová and M. rasilis Dürrschmidt, have been studied in detail by molecular and morphometric methods. Our investigations uncovered the existence of a new species found in water bodies in Vietnam, which we describe here as Mallomonas furtiva sp. nov. This...

Fucoxanthin is one of the most abundant carotenoids in nature. It is a major carotenoid in heterokont and haptophyte groups of algae that includes > 20 thousand species. Fucoxanthin also has many beneficial health effects including anticancer, antihypertensive, anti-inflammatory, and antiobesity effects. Microalgae are a promising source of fucoxan...

Species from the Mallomonas bronchartiana complex were examined using material from Vietnam, the U.S.A. and South Korea. The original description of Mallomonas bronchartiana is expanded and descriptions of two new taxa, M. pseudobronchartiana and M. velari, are given. All taxa possess body scales that are large, broad, with an asymmetrically-placed...

Molecular data (rbcL and 18S) of 36 Planothidium strains were analysed. Twenty-seven strains were also studied morphologically by light microscopy and scanning electron microscopy: six strains from Berlin, two strains from the Faroe Islands, four strains from Lake Baikal, seven strains from Korea and eight strains from Mexico. The findings were com...

The focus of this paper is the sexual reproduction and phylogeny of Schizostauron Grunow, which were studied using clonal cultures isolated from the Indian Ocean coast of Mozambique near Tofo and Bazaruto. Taxa of Schizostauron were characterized by light and electron microscopy and a phylogeny derived from three genes (rbcL, psbC and short subunit...

The latest special studies of the genus Synura in Russia were conducted in the 1970s. In the last decade, 14 new species of the genus were described based on molecular and morphological data. The total number of valid taxa of the genus has increased to 49. Only 18 taxa of Synura are known in Russia up to date, and the diversity of the genus on this...

Sexual reproduction and mating system of the freshwater diatom Ulnaria acus (Bacillariophyta) was described for the first time. Mating system of the species includes, apparently, only heterothallic way of reproduction: during the three-year observation period neither male nor female clones have shown the ability to reproduce homothallically. The ty...