European Journal of Phycology最新文献

{"title":"Two new species of Pyramimonas (Pyramimonadophyceae, Chlorophyta) associated with the subgenus Trichocystis from coral lagoons of the Ryukyu Archipelago, Japan","authors":"S. Sym, S. Suda, T. Horiguchi","doi":"10.1080/09670262.2022.2116750","DOIUrl":"https://doi.org/10.1080/09670262.2022.2116750","url":null,"abstract":"ABSTRACT The characteristics of two new benthic species of Pyramimonas isolated from coral rubble have been determined. One, P. superba sp. nov., most similar to P. lunata, has a morphological character suite and molecular phylogenetic signal supporting it as a member of the subgenus Trichocystis, despite its uniqueness in producing mucilage. The other, P. lamellipunctata sp. nov., also shows phylogenetic affiliation with the subgenus Trichocystis using partial SSU data. However, this second species aligns with muciferous punctate species using rbcL data, although the clade is problematic as it includes the genus Pterosperma. Morphologically, cells of P. lamellipunctata share many features with muciferous punctate species but also exhibit important disparities with this group, most notably a lack of mucilage, suggesting that they form a unique lineage. HIGHLIGHTS ● Two new species of Pyramimonas are indicated as members of the subgenus Trichocystis using SSU data.● rbcL data only supports this association for one of the new species and affiliates the other with muciferous species of the subgenus Punctatae.● Morphological data only partially supports the second affiliation with punctate species, thereby inferring a unique lineage.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"333 - 350"},"PeriodicalIF":2.4,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49073687","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}

{"title":"Biogeography of six species in the planktonic diatom genus Bacteriastrum (Bacillariophyta)","authors":"R. Piredda, D. Sarno, D. De Luca, W. Kooistra","doi":"10.1080/09670262.2021.2021591","DOIUrl":"https://doi.org/10.1080/09670262.2021.2021591","url":null,"abstract":"ABSTRACT Marine planktonic diatom species can exhibit contrasting distribution patterns, from endemic to cosmopolitan. Endemicity is counter-intuitive for planktonic species given their potentially large population sizes and ample migration opportunities by means of ocean currents. Here, we analyse the biogeography of six species of the diatom genus Bacteriastrum with apparently contrasting distribution patterns. Occurrence data obtained from metabarcode reads in samples from Ocean Sampling Day (OSD) sites and from Tara Oceans stations as well as from their observational records included in biodiversity data repositories of GBIF and OBIS were plotted in occurrence maps. According to metabarcoding data, the six species examined here occur all over the temperate and tropical parts of the oceans. Observational records corroborate this finding for B. elegans, B. furcatum, B. hyalinum and B. mediterraneum. Instead, atypical colony former B. jadranum is encountered at just a few distant sites, and solitary B. parallelum only in the Gulf of Naples. The metabarcoding data reveal that the latter two species are far more widely distributed than their actual sightings according to GBIF and OBIS, and that B. hyalinum also occurs in the Arctic. The most likely reasons for the discrepancies among the different data sources are the relatively recent description of B. jadranum and B. parallelum, their diminutive and inconspicuous habitus, and their possible misidentification in routine plankton counting. HIGHLIGHTS • Metabarcoding data of Tara Oceans and OSD discern Bacteriastrum species.• Pan-oceanic distribution of Bacteriastrum species according to global metabarcoding data.• Distribution patterns of phytoplankton species can be inferred from global metabarcode datasets.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"57 1","pages":"446 - 457"},"PeriodicalIF":2.4,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49381576","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}

{"title":"Vegetative cell enlargement in selected centric diatom species – an alternative way to propagate an individual genotype","authors":"I. Kaczmarska, J. Ehrman, K. Mills, S. Sutcliffe, Brajogopal Samanta","doi":"10.1080/09670262.2022.2112760","DOIUrl":"https://doi.org/10.1080/09670262.2022.2112760","url":null,"abstract":"ABSTRACT Vegetative cell enlargement (VCE) and structures involved are documented for the first time using epifluorescence and electron microscopy. We examined three centric diatom species with polar and non-polar valve outlines. VCE progressed in two ways. The first involved liberation of the protoplast, nearly isodiametric expansion, and building of the large frustule in a more or less spherical cell. Protoplast retraction as observed in sexual auxospores before the formation of initial valves was never observed. Cell walls produced a variety of scales, including valve-like scales before the first enlarged epivalve was deposited. VCE wall structures were not similar to auxospore walls of the same species. The morphology of the first enlarged valve, the epivalve, differed from that of typical vegetative valves to a varying degree, depending on the species. The second way to vegetatively enlarge cells involved expansion of the girdle region of the existing small frustule. The circumference of the girdle region grew due to the deposition of irregular, supernumerary copulae. These copulae produced one or more protuberances, resulting in a misshapen cell. This misshapen cell then divided mitotically, and the first enlarged valve was a hypovalve. Hypovalve morphology strongly differed from that of typical vegetative valves. Several subsequent mitotic divisions were required to restore normal, species-specific frustules. Over time, irrespective of the manner of enlargement, the enlarged cells grew well and eventually became more frequent than small cells in our cultures. The scale factors of enlarged cells compared with pre-enlargement size in our experiments (1.1–5.2) were similar to those reported for other species (1.4–7.5). Additionally, we found that size increases from VCE were comparable to those resulting from sexual reproduction of the same species. Therefore, VCE can potentially expand the resident time of the population in the environment to the same degree as would production of sexual initial cells. HIGHLIGHTS Species vegetatively restore large cell size in different ways. Scale factors in sexually and vegetatively enlarged cells are similar. VCE may not be as rare as reported in nature.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"315 - 332"},"PeriodicalIF":2.4,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46867834","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}

{"title":"Seasonal ecophysiology of Fucus vesiculosus (Phaeophyceae) in the Northern Baltic Sea","authors":"Antti Takolander","doi":"10.1080/09670262.2022.2110288","DOIUrl":"https://doi.org/10.1080/09670262.2022.2110288","url":null,"abstract":"ABSTRACT The brown macroalga Fucus vesiculosus is a foundation species in temperate rocky shores, subjected to seasonally fluctuating environmental conditions. To obtain a more complete picture of the seasonality of F. vesiculosus ecophysiology in the northern Baltic Sea, in situ photochemistry, elemental ratios and chlorophyll a and c content of the alga were investigated in field campaigns conducted in different months throughout the year during 2017. Carbon, nitrogen, carbon to nitrogen ratio and chlorophyll a and c content of the alga varied substantially throughout the year, with highest carbon content observed in summer, and highest nitrogen content in winter. C:N ratio in F. vesiculosus apical tissue ranged from 8.6 in February to 48.3 in July. Chlorophyll a and c content followed inversely the seasonal patterns of ambient irradiance. High chlorophyll a and c content in winter was associated with higher maximum photosynthetic efficiency of energy conversion (Fv/Fm), but not with efficiency of photosynthetic energy conversion under light limitation (α). Electron transport rate correlated strongly with seawater temperature, and the highest electron transport rates were observed in summer and correlated with highest internal carbon content of the alga. Redundancy analysis conducted on measured environmental variables against physiological responses identified day of year, temperature and macronutrients in seawater as the most important variables driving the observed seasonal patterns in F. vesiculosus ecophysiology. The results suggest elevated temperatures may increase Fucus growth and photosynthesis rates in the study area. Highlights Two distinct physiological states of Fucus vesiculosus were identified. The most important variables driving responses were season, temperature and macronutrients. Fucus ecophysiology shows substantial seasonality in the northern Baltic Sea.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"300 - 314"},"PeriodicalIF":2.4,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43426620","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}

{"title":"Regional microbiome differentiation of the invasive Sargassum muticum (Fucales, Phaeophyceae) follows the generalist host hypothesis across the North East Atlantic","authors":"T. Aires, A. Kläui, A. Engelen","doi":"10.1080/09670262.2022.2103738","DOIUrl":"https://doi.org/10.1080/09670262.2022.2103738","url":null,"abstract":"ABSTRACT Over 90% of introduced marine species are seaweeds. Seaweeds rely on their microbiome for host settlement, nutrition, development and health. As such, it is likely that microbiomes are involved in seaweed invasions. Sargassum muticum, indigenous to Southeast Asia, inhabits the North-east Atlantic from Norway to Morocco. This is the only known successful case of a non-clonal marine invader with almost no genetic variation over its large NE Atlantic introduced range. This makes it a very interesting model to study an invasive seaweeds microbiome, as it practically uncouples host genetic variation from microbiome variation. Associated bacteria potentially contribute to the plasticity and acclimation of S. muticum leading to its success over the last 50 years. Dispersing host organisms can either bring their acquired microbes along or obtain new ones locally, following the mutualist and generalist host hypothesis, respectively. We used partial 16S rRNA gene amplicon sequencing to characterize the total and core microbiome across S. muticum structures/tissues from five NE Atlantic regions, from Norway to Morocco, covering over 30° of latitude. In contrast to host genotypes, highly diverse, regional, total and core microbiomes, with differentiation levels depending on tissue, bacterial community structure were detected. Atlantic S. muticum follows the generalist host hypothesis, possibly recruiting a new microbiome in each new region. This host promiscuity may promote the invasiveness of S. muticum. Diversity was lower in the young/annual tissues compared with the older tissues for the total bacterial community, suggesting that these are mostly transitory bacteria accumulating over time in the older parts. The total core microbiome included 10 OTUs, representing dominant community members commonly found in other seaweeds’ cores. The core Granulosicoccus OTU followed a clear regional pattern where northern and southern regions clustered differentially, suggesting a regional signature even at an OTU level. HIGHLIGHTS North-east (NE) Atlantic Sargassum muticum microbiome differentiation does not match host genetic background. NE Atlantic S. muticum shows a geographic region and tissue-specific total and core bacterial community matching bestthe generalist host hypothesis. Core OTU – the bacterium Granulosicoccus – shows a strong regional specialization.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"268 - 283"},"PeriodicalIF":2.4,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43808970","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}

{"title":"The productivity effects of macroalgal biochar from Ulva Linnaeus bloom species on Arabidopsis thaliana Linnaeus seedlings","authors":"F. Kenneth, Catherine F.H. Joniver, W. Meredith, J. Adams","doi":"10.1080/09670262.2022.2103739","DOIUrl":"https://doi.org/10.1080/09670262.2022.2103739","url":null,"abstract":"ABSTRACT Intensive agricultural practices and poor management of organic waste have adverse effects on aquatic ecosystems, where excessive macroalgal proliferation can occur to form ‘green tides’, with negative environmental, ecological and socioeconomic impacts. One novel method for converting a problematic material into a valuable resource is to use excess algal biomass as a feedstock for biochar production. With a high elemental composition, such a resource might be suitable to redress soil deficiencies and to ameliorate soil fertility. Green macroalgae from the Ulva genus, in bladed (predominantly U. rigida), tubular (predominantly U. prolifera) and mixed morphological (U. rigida and U. prolifera) phenotypes, were used to produce biochars. A pot trial within a controlled-environment chamber was carried out to determine the effects of amending high- and low-fertilizer compost with algal biochars (applied at 0, 0.5, 1, 2 and 5% w/w) on the growth rate of Arabidopsis thaliana. A commercial wood-based biochar was used under similar treatments as a control. Weekly imaging and final harvest weights provided additional growth data; composition data including ultimate and proximate analyses, pH, Brunauer–Emmett–Teller (BET) surface area and hydropyrolysis of the dried macroalgae and algal biochars were also conducted. Significant enhanced growth in seedlings grown with biochar amendment were not observed in high- or low-fertilizer compost, and the addition of algal biochars at 5% w/w to high-fertilizer soil significantly reduced plant growth. Elemental analysis revealed that the algal biochars contained high quantities of alkaline elements including sodium. It was hypothesised that salinity was the primary factor affecting plant growth at higher biochar application rates, despite the algae being sourced from an estuarine environment. Biochar provenance and composition is highly significant: using the catch-all term ‘biochar’ ignores both the range of materials and composition that could be used to create it and its subsequent impact within the soil. HIGHLIGHTS First plant trial using biochar predominantly from Ulva species. Negative impact seen with 5% algal biochar on plant growth. High sodium concentrations putatively identified as reduced plant growth cause. Graphical Abstract","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"284 - 299"},"PeriodicalIF":2.4,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41388907","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}

{"title":"Diversity, systematics and biogeography of French Polynesian Lobophora (Dictyotales, Phaeophyceae)","authors":"C. Vieira, O. De Clerck, Antoine de Ramon N’Yeurt, S. D’hondt, L. Millet, M. Kim, C. Payri, M. Zubia","doi":"10.1080/09670262.2022.2092216","DOIUrl":"https://doi.org/10.1080/09670262.2022.2092216","url":null,"abstract":"ABSTRACT We re-evaluated the diversity of Lobophora using an integrative taxonomic approach based on a broad sampling across French Polynesian archipelagos. Our results show that French Polynesia supports at least 37 Lobophora species of which ~57% (21) are endemic. This level of endemicity is comparable to that presently known in the Caribbean and the western Indian Ocean, while French Polynesian coastlines cover a much smaller length. With a third of the species in common, French Polynesia shares considerable biogeographic affinities with the Melanesian Islands, situated over 4000 km to the west. Distribution ranges of a few species reach the western Indian Ocean, and two species also occur in the Atlantic. We hypothesize that Lobophora species in French Polynesia have mainly evolved into endemic species from colonizers originating from the Central Indo-Pacific. These rare dispersal events to ocean archipelagos followed by a long period of isolation and speciation represent an important process responsible for the high level of endemism in remote archipelagos. While south-eastern Pacific Islands could be considered an ‘evolutionary graveyard’ for the genus Lobophora as little local radiation occurred, this may simply be due to recent evolutionary history. Based on these new data, the diversity of Lobophora represents ~10% of French Polynesian seaweed diversity. Eighteen new species of Lobophora are here described from French Polynesia. Highlights Lobophora species diversity and biogeography in French Polynesia were investigated. Twenty-three species of Lobophora were newly identified, and 18 new species were described. This is the first inter-archipelago diversity and biogeographic study for a macroalgal genus in the French Polynesian region.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"226 - 253"},"PeriodicalIF":2.4,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45622035","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}

{"title":"First records of the non-indigenous green algal species Siphonocladus tropicus (Cladophorales, Chlorophyta) and Caulerpa integerrima (Bryopsidales, Chlorophyta) in the Mediterranean Sea","authors":"R. Hoffman, O. De Clerck, F. Leliaert","doi":"10.1080/09670262.2022.2095442","DOIUrl":"https://doi.org/10.1080/09670262.2022.2095442","url":null,"abstract":"ABSTRACT We provide an account of two newly recorded non-indigenous tropical seaweed species, Siphonocladus tropicus (Cladophorales, Chlorophyta) and Caulerpa integerrima (Caulerpaceae, Chlorophyta), from the northern and central Levantine Mediterranean shores of Israel. Reports are supported by morphological and molecular evidence. The new record of C. integerrima, thought to be endemic to the Red Sea, increases the number of non-indigenous Caulerpa species in the Mediterranean Sea to eight. Siphonocladus tropicus, a widespread tropical species, is also being reported from the northern Red Sea. Furthermore, morphological comparison of populations from the northern Red Sea and the Levantine Mediterranean shore of Israel revealed that there might be a regional variant or form of this species in the northern Red Sea and might indicate that this new invader does not necessarily originate from the Red Sea. The increasingly tropical conditions in the eastern Levantine Sea as a result of global warming probably paved the way for the establishment of both species in the region. Aspects of the new invaders’ ecology in the Israeli Levantine Sea, the possible vectors of introduction and origins, as well as the status of other Caulerpa species from both Levantine and Red Sea shores, are discussed. HIGHLIGHTS Siphonocladus tropicus and Caulerpa integerrima are new non-native species found lately in the Mediterranean Sea. Caulerpa integerrima originated from the Red Sea whereas the origin of Siphonocladus tropicus is uncertain. The introduction of these two alien species, especially Caulerpa integerrima, might pose a threat to the local marine flora and fauna.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"255 - 267"},"PeriodicalIF":2.4,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47955159","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}

{"title":"Nannochloropsis oceanica (Eustigmatophyceae) mutants resistant to rose bengal demonstrate high tolerance to oxygen","authors":"C. Faraloni, G. Torzillo, A. Vonshak","doi":"10.1080/09670262.2022.2087907","DOIUrl":"https://doi.org/10.1080/09670262.2022.2087907","url":null,"abstract":"ABSTRACT The genus Nannochloropsis (Eustigmatophyceae), including N. oceanica, has attracted considerable interest, due to its ability to accumulate high levels of lipids. Under large-scale cultivation outdoors, cells are exposed to a combination of high oxygen and light irradiance conditions that may promote photoinhibition, so selecting strains able to tolerate oxidative stress is desirable. Rose bengal (RB) reacts with oxygen to form singlet oxygen in the presence of light. Therefore, RB can be a very useful tool for testing the sensitivity of algae to oxidative stress and thus identify strains capable of photosynthesis under oxidative stress. In this study, two mutants of N. oceanica, RB2 and RB113, which are resistant to high concentrations of rose bengal, were phenotypically characterized for their sensitivity to high oxygen concentrations. Both strains exhibited levels of catalase and ascorbate peroxidase 1.5- and 3-fold higher, respectively, than the wild type. In addition, the synthesis of carotenoids was lower than in the wild type, indicating lower oxidative stress. These results were confirmed by chlorophyll fluorescence measurements, which indicated a lower sensitivity of the photosynthetic apparatus of the mutants, especially of RB2, even in the presence of H2O2. The results support the hypothesis that resistance to rose bengal may also induce resistance to high dissolved oxygen stress. The ability shown by the mutants to perform photosynthesis more efficiently under high oxygen stress than the wild type makes them promising candidates for outdoor cultures.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"214 - 225"},"PeriodicalIF":2.4,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49235126","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}

{"title":"Cell fine structure and phylogeny of Parvodinium: towards an ultrastructural characterization of the Peridiniopsidaceae (Dinophyceae)","authors":"Mariana S. Pandeirada, S. C. Craveiro, N. Daugbjerg, Ø. Moestrup, A. Calado","doi":"10.1080/09670262.2022.2091798","DOIUrl":"https://doi.org/10.1080/09670262.2022.2091798","url":null,"abstract":"Abstract Recent molecular phylogenies that include species of Parvodinium revealed as its closest relatives the genera Peridiniopsis, Palatinus and Johsia. The clade containing these taxa is currently recognized as a family, Peridiniopsidaceae. The affinity between the members of Peridiniopsidaceae cuts across traditional boundaries based on features of the amphiesma, most notably the presence or absence of an apical pore complex. Detailed descriptions of the fine structure of Peridiniopsis and Palatinus are available from TEM studies of their type species. Here we provide a description in comparable detail of a species of the Parvodinium umbonatum–inconspicuum complex, which includes the type of the genus. The cells had an apical fibrous complex essentially similar to those described from other peridinioids prepared with comparable fixations. The pusular system was extensive and included areas with different aspects: an area with a sheet-like vesicle along the mid-right side of the cell, a ventral portion with ramified and anastomosed tubes and a somewhat flattened tube attached to the transverse flagellar canal. The most remarkable feature was the microtubular strand that extended from a ventral, protruding peduncle to the anterior part of the epicone, around an accumulation body, and came around along a more dorsal position toward the ventral side. This long microtubular strand of the peduncle (MSP) was reminiscent of the one described from Peridiniopsis borgei, both by its extension and looping path, and by the breaking up of the strand of microtubules into smaller portions with a wavy appearance; and contrasted with the reduced MSP of Palatinus apiculatus. The fine-structural features currently known from Peridiniopsidaceae are summarized. Members of the family include a flagellar apparatus with four microtubule-containing roots associated, the basal bodies inserted close to each other, nearly at right angles and a three-armed fibrous connective between root 1 and the transverse basal body. HIGHLIGHTS Detailed fine structure of Parvodinium (of P. umbonatum–P. inconspicuum complex). Comparative analysis of the ultrastructure of Parvodinium and other Peridiniopsidaceae. Summary of ultrastructural features of the family Peridiniopsidaceae.","PeriodicalId":12032,"journal":{"name":"European Journal of Phycology","volume":"58 1","pages":"169 - 189"},"PeriodicalIF":2.4,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45845312","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}