Ultrastructure of a Hyalodiscus species (Bacillariophyceae; Subclass: Coscinodiscophycidae, Fam. Hyalodiscaceae) from brackish waters of Tonga, Oceania.

Rott, Eugen; Kofler, Werner; Schabetsberger, Robert

doi:10.5507/fot.2009.029

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…A similar morphology usually occurs in Arcellinida species, such as Arcella or Galeripora , whose organisms inhabit marshes and other freshwater habitats and whose shells have been found to survive chemical treatments applied for pollen preparation methods (Andrews et al., 2021; González‐Miguéns et al., 2022; Payne et al., 2012). However, degraded valves of centric diatoms (e.g., Hyalodiscus species) cannot be excluded as the source of these peculiar microremains (Rott et al., 2009).…”

Section: Resultsmentioning

confidence: 99%

Microparticles from dental calculus disclose paleoenvironmental and palaeoecological records

D'Agostino,

Di Marco,

Rolfo

et al. 2024

Ecology and Evolution

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Plants have always represented a key element in landscape delineation. Indeed, plant diversity, whose distribution is influenced by geographic/climatic variability, has affected both environmental and human ecology. The present contribution represents a multi‐proxy study focused on the detection of starch, pollen and non‐pollen palynomorphs in ancient dental calculus collected from pre‐historical individuals buried at La Sassa and Pila archaeological sites (Central Italy). The collected record suggested the potential use of plant taxa by the people living in Central Italy during the Copper‐Middle Bronze Age and expanded the body of evidence reported by previous palynological and palaeoecological studies. The application of a microscopic approach provided information about domesticated crops and/or gathered wild plants and inferred considerations on ancient environments, water sources, and past health and diseases. Moreover, the research supplied data to define the natural resources (e.g., C4‐plant intake) and the social use of the space during that period. Another important aspect was the finding of plant clues referable to woody habitats, characterised by broad‐leaved deciduous taxa and generally indicative of a warm‐temperate climate and grassy vegetation. Other unusual records (e.g., diatoms, brachysclereids) participated in defining the prehistoric ecological framework. Thus, this work provides an overview on the potential of the human dental calculus analysis to delineate some features of the ancient plant ecology and biodiversity.

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Section: Resultsmentioning

confidence: 99%

Microparticles from dental calculus disclose paleoenvironmental and palaeoecological records

D'Agostino,

Di Marco,

Rolfo

et al. 2024

Ecology and Evolution

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“…The rimoportulae in Hyalodiscus occur in a ring at a certain distance along the valve mantle edge and also scattered over the rest of the mantle and valve face (Round et al 1990). Species of Hyalodiscus have a cingulum composed of closed elements perforated by a single row of roundish poroids (Rott et al 2009). Arcanodiscus platti sp.…”

Section: Discussionmentioning

confidence: 99%

A new order and family of diatoms: Arcanodiscales, Arcanodiscaceae (Bacillariophyta) to accommodate Arcanodiscus platti gen. nov. et sp. nov. from the Argentinian Patagonia

Maidana¹,

Morales²,

Bradbury³

et al. 2018

nova_suppl

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A new diatom, Arcanodiscus platti gen. nov. et sp. nov., is described from the Argentinian Patagonia with a novel combination of features. Frustules are robust, strongly silicifi ed, with large and thick central hyaline area and thick valve mantle, under the valve edge often with external parallel undulations. Valves without labiate or strutted processes, the valve mantle areolae internally with rotae; a combination of features that has not been described before. The new taxon is morphologically closely related to several representatives of the genus Melosira C.A. Agardh, e.g., M. robusta Hustedt (Houk comm.). However, it diff ers from them by the discoid frustules solitary or forming short fi laments, non-loculate, tubular areolae occluded internally by rotae, lacking of processes, but having a single special round apperture, herein termed the portula. Therefore, a new order and family, Arcanodiscales ord. nov. and Arcanodiscaceae fam. nov., are here described to allocate the genus Arcanodiscus gen. nov. Morphological details of the new species, based on a combined light (LM) and scanning electron (SEM) microscopy, as well as ecological aspects, are discussed in the light of available information.

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“…Most notable is a belt of quincunx pore areolae on the mantle and valve face. Similarly organized, simple pore areolae are also found in Hyalodiscus [ 71 – 73 ], Hyalodiscopsis [ 74 ], Truania [ 67 ] and Podosira [ 2 ]. Furthermore, Paralia guyana initial valves bear clear similarities to valves of Pseudopodosira , which have better defined, concentric elevations on the valve face but have a characteristic, similar marginal band of quincunx poroid areolae on the valve face and the mantle [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

Auxosporulation in Paralia guyana MacGillivary (Bacillariophyta) and Possible New Insights into the Habit of the Earliest Diatoms

Kaczmarska

Ehrman

2015

PLoS ONE

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BackgroundDiatoms are one of the most ecologically important aquatic micro-eukaryotes. As a group unambiguously recognized as diatoms, they seem to have appeared relatively recently with a limited record of putative remains from oldest sediments. In contrast, molecular clock estimates for the earliest possible emergence of diatoms suggest a considerably older date. Depending on the analysis, Paralia and Leptocylindrus have been recovered within the basal molecular divergences of diatoms. Thus these genera may be in the position to inform on characters that the earliest diatoms possessed.FindingsHere we present auxospore development and structure of initial and post-auxospore cells in a representative of the ancient non-polar centric genus Paralia. Their initial frustules showed unusual, but not unprecedented, spore-like morphology. Similarly, initial frustules of Leptocylindrus have been long considered resting spores and a unique peculiarity of this genus. However, even though spore-like in appearance, initial cells of Paralia readily resumed mitotic divisions. In addition, Paralia post-auxospore cells underwent several rounds of mitoses in a multi-step process of building a typical, “perfect” vegetative valve. This degree of heteromorphy immediately post-auxosporulation is thus far unknown among the diatoms.ImplicationsA spore-related origin of diatoms has already been considered, most recently in the form of the “multiplate diploid cyst” hypothesis. Our discovery that the initial cells in some of the most ancient diatom lineages are structurally spore-like is consistent with that hypothesis because the earliest diatoms may be expected to look somewhat similar to their ancestors. We speculate that because the earliest diatoms may have appeared less diatom-like and more spore-like, they could have gone unrecognized as such in the Triassic/Jurassic sediments. If correct, diatoms may indeed be much older than the fossil record indicates, and possibly more in line with some molecular clock predictions.

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Ultrastructure of a Hyalodiscus species (Bacillariophyceae; Subclass: Coscinodiscophycidae, Fam. Hyalodiscaceae) from brackish waters of Tonga, Oceania.

Cited by 4 publications

References 5 publications

Microparticles from dental calculus disclose paleoenvironmental and palaeoecological records

Microparticles from dental calculus disclose paleoenvironmental and palaeoecological records

A new order and family of diatoms: Arcanodiscales, Arcanodiscaceae (Bacillariophyta) to accommodate Arcanodiscus platti gen. nov. et sp. nov. from the Argentinian Patagonia

Auxosporulation in Paralia guyana MacGillivary (Bacillariophyta) and Possible New Insights into the Habit of the Earliest Diatoms

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