The stomatocyst of Dinobryon sociale var. americanum (Chrysophyceae)

Piątek, Jolanta; Kowalska, Joanna

doi:10.1127/0029-5035/2008/0087-0161

Cited by 5 publications

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“…Features such as shape and size, collar shape, surface texture, surface ridges, pits, papillae, and spines all contribute to the distinctiveness of the stomatocysts of chrysophytes (International Statospore Working Group; Cronberg and Sandgren, 1986;Duff et al, 1995;Holen, 2014;Wilkinson et al, 2001). For example, Piatek and Kowalska (2008) recently confirmed Cronberg's belief (p. 69, in Duff et al, 1995) that the stomatocyst produced by Dinobryon sociale var. By convention, a numbering system is used to keep track of the published morphotypes of stomatocysts, because they are rarely physically attached to remnant vegetative structures of the cell that produced them.…”

Section: Reproductionmentioning

confidence: 66%

Chrysophyceae and Phaeothamniophyceae

Nicholls¹,

Wujek

2015

Freshwater Algae of North America

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Section: Reproductionmentioning

confidence: 66%

Chrysophyceae and Phaeothamniophyceae

Nicholls¹,

Wujek

2015

Freshwater Algae of North America

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“…With the development of scanning electron microscopy (SEM), the ultrastructure of stomatocysts in Dinobryon species have received scientific attention, for example, as ecological paleoindicators in the sediment of certain lakes (Duff et al, 1995;Wilkinson et al, 2001). Since stomatocysts in Dinobryon species were first described by Stein (1878) and Bütschli (1878), the morphologies of stomatocysts have been reported in approximately 20 Dinobryon taxa; however, the stomatocyst ultrastructure of only five Dinobryon species have been described in detail using SEM (Sandgren, 1983;Piatek and Kowalska, 2008;Piatek et al, 2012;Piatek et al, 2020). Most of these were described from field specimens, and the cyst morphology on the basis of culture materials remains little known, except for that of D. cylindricum (Sandgren, 1983).…”

Section: Introductionmentioning

confidence: 99%

Multigene phylogeny reveals a cryptic diversity in the genus Dinobryon (Chrysophyceae) with integrative description of five new species

et al. 2023

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IntroductionThe genus Dinobryon is one of the most recognizable chrysophyte genera, characterized by dendroid colonies with a biflagellate inside each cellulosic lorica. The representative forms of lorica are cylindrical, conical, vase, or funnel shaped, with undulation on the lorica wall. Traditionally, the morphological characteristics of the lorica and the colony organization have been used for the delimitation of Dinobryon species.MethodsTo understand the taxonomy and phylogeny of colonial Dinobryon species, we performed molecular and morphological studies using 39 unialgal cultures and 46 single colony isolations from environmental specimens collected in Korea. We used a nuclear internal transcript spacer (ITS1-5.8S-ITS2) to find the genetic diversity of Dinobryon from environmental samples and a combined dataset from six gene sequences (nuclear SSU and LSU rRNA, plastid LSU rRNA, rbcL and psaA, and mitochondrial CO1 genes) for phylogenetic analysis.Results and discussionWe found 15 different lineages based on the genetic diversity of the nuclear ITS sequences. The phylogenetic tree of the colonial species based on the combined multigene dataset were divided into 18 subclades, including five new species, each with unique molecular signatures for the E23-5 helix of the V4 region in the nuclear SSU rRNA and the E11-1 helix of D7b, and the E20-1 helix of D8 regions in the nuclear LSU rRNA. Morphological studies were focused on lorica dimension and shape, and stomatocyst morphology. The Dinobryon species showed similarities or differences in lorica morphologies between and within species, and also differences in lorica size between culture and environmental samples. Five Dinobryon species formed distinctive stomatocysts, their stomatocyst morphologies, including collar structure, surface ornamentation, and cyst shape, showed unique characteristics in each species and were useful for identification. Here, we propose five new species based on morphological and molecular evidences: D. cylindricollarium, D. exstoundulatum, D. inclinatum, D. similis, and D. spinum.

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“…Stomatocysts are species-specific, but only 10-15% of them are conclusively linked with living chrysophytes (e.g. Smol 1984, Cronberg 1988a, 1989a, 1992, 1995, Kristiansen 1989, Siver 1991, Cronberg & Laugaste 2005, Coradeghini & Vigna 2008, Kim & Kim 2008, Piątek & Kowalska 2008, Findenig et al 2010, Piątek et al 2012, mainly because of difficulty with findings of encysting chrysophytes in nature and culture experiments.…”

Section: Introductionmentioning

confidence: 99%

Morphological variability of new chrysophyte stomatocyst forming a single-cyst assemblage in a low-conductivity tropical lake in the Guineo-Congolian rainforest

Piątek

2014

Phytotaxa

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Morphological variation of the chrysophyte stomatocyst found in surface sediments of a small, shallow lake in the Guineo-Congolian rainforest in eastern Cameroon, is described, illustrated and discussed. Neither living cells nor scales of chrysophytes were observed in the lake. The stomatocyst cannot be assigned to any known cyst and is described as new to science (stomatocyst #49) using International Statospore Working Group (ISWG) guidelines. This is the third report of stomatocysts in Africa, and the second from the tropical part of this continent. Some basic ecological information on the sampling site is provided and compared with similar data from other sampling sites of chrysophytes in Africa.

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The stomatocyst of Dinobryon sociale var. americanum (Chrysophyceae)

Cited by 5 publications

References 0 publications

Chrysophyceae and Phaeothamniophyceae

Chrysophyceae and Phaeothamniophyceae

Multigene phylogeny reveals a cryptic diversity in the genus Dinobryon (Chrysophyceae) with integrative description of five new species

Morphological variability of new chrysophyte stomatocyst forming a single-cyst assemblage in a low-conductivity tropical lake in the Guineo-Congolian rainforest

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