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zygospores

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Journal Article
Published: 01 July 1992
Micropaleontology (1992) 38 (3): 237-260.
Journal Article
Journal: Palynology
Published: 01 June 2013
Palynology (2013) 37 (1): 48-61.
...Sofie Lindström Abstract The probable zygnematacean zygospore Tetranguladinium is recorded in Mesozoic strata from southern Scandinavia for the first time. Tetranguladinium , which exhibits morphological similarities to the extant filamentous green alga Mougeotia , occurs in Jurassic–Cretaceous (J...
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Image
Interpreted life cycles of  Spiralicellula bulbifera  involving both sexual...
Published: 01 January 2014
envelope; it becomes a cyst, or zygospore, waiting to reproduce by dividing into haploid aplanospores (or zoospores if flagellated) or developing spirally arranged row of holes in the thickened cyst wall ( Fig. 1 .1–1.3, 1.5–1.7); 2 , zygospore ( Fig. 1 .11); 3 , aplanospores (or zoospores) are produced
Image
Transmitted light photomicrographs of selected pollen, spore, and algal tax...
in > Palynology
Published: 01 January 2009
(fresh water alga) zygospore, #7/1, G33/4.
Journal Article
Journal: Palynology
Published: 02 January 2017
Palynology (2017) 41 (1): 17-30.
... increased in this phase, which is reflected by the comparatively high frequencies of Cerealia and other cultivars. The aquatic elements such as Lemna sp. and Potamogeton sp. along with freshwater algae Zygnema sp. (zygospores) also thrived well in the swamp. The presence of Alnus sp., Betula sp...
Journal Article
Published: 01 November 2004
Proceedings of the Yorkshire Geological Society (2004) 55 (2): 145-158.
... by palynologists to infer non-marine palaeoenvironmental conditions ( Guy-Ohlson 1992 ). Similarly, modern zygospores are exclusively freshwater in origin, and their fossil counterparts have been used by authors (e.g. van Geel 1976 ) to suggest freshwater conditions, the assumption being that these taxa presently...
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Journal Article
Published: 01 January 2014
Journal of Paleontology (2014) 88 (1): 92-98.
... envelope; it becomes a cyst, or zygospore, waiting to reproduce by dividing into haploid aplanospores (or zoospores if flagellated) or developing spirally arranged row of holes in the thickened cyst wall ( Fig. 1 .1–1.3, 1.5–1.7); 2 , zygospore ( Fig. 1 .11); 3 , aplanospores (or zoospores) are produced...
FIGURES
Journal Article
Journal: Palynology
Published: 03 July 2017
Palynology (2017) 41 (3): 401-411.
... with an average of <1% pollen are present in this zone. Algal spores such as the zygospores of Zygnema sp. (average 1.5%) and Spirogyra sp. (average 0.5%) are scantily represented. The fungal remains range from 2.5 to 44% of the total sum. This pollen zone with a time bracket of ∼4939–∼3762 cal yr BP...
Journal Article
Journal: Palynology
Published: 02 October 2017
Palynology (2017) 41 (4): 504-515.
... in comparatively lower values (average 1%). Lemna and Typha are the aquatic taxa which were recorded in very low frequencies (<1%); whereas, Zygnema and Spirogyra (zygospores) have 2.4–3% pollen, thus, maintained their low record in this zone too. Botryococcus , an algal spore, appeared for the first...
Journal Article
Journal: Palynology
Published: 02 January 2017
Palynology (2017) 41 (1): 72-88.
... degradation. Other algae present in the sediment but absent in the water samples included most species of Gloeotrichia , Pediastrum , Peridinium willeii and Spirogyra zygospores. We consider their presence as an indication of high preservation potential, in spite of their absence in the water. Algal...
Journal Article
Journal: Palynology
Published: 03 April 2017
Palynology (2017) 41 (2): 171-179.
... into the differential corrosion susceptibility of pollen and spores . Pollen et Spores 6 : 621 – 635 . Havinga AJ. 1967 . Palynology and pollen preservation . Review of Palaeobotany and Palynology 2 : 81 – 98 . Head MJ. 1992 . Zygospores of Zygnemataceae (Division Chlorophyta) and other...
Journal Article
Journal: Palynology
Published: 02 January 2018
Palynology (2018) 42 (1): 55-65.
... light on the evolution of Lake Simcoe based on pollen, NPPs and testate amoebae. In the present study, various recovered algal as well as fungal remains which also have a bearing on the palaeoclimatic condition will be discussed. Amongst the algal remains, zygospores of Zygnema and Spirogyra (family...
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Journal Article
Journal: Palynology
Published: 02 January 2019
Palynology (2019) 43 (1): 34-42.
... the pollen assemblages. Poaceae (grasses), Cerealia, Chenopodiaceae/Amaranthaceae (Amaranthaceae), Caryophyllaceae, Tubuliflorae (Asteraceae), Malvaceae and Xanthium are the terrestrial herbaceous taxa recorded scarcely in the pollen rain. Zygospores...
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Journal Article
Journal: Palynology
Published: 01 June 2013
Palynology (2013) 37 (1): 35-47.
...) , emend. Schrank 2004 . Mendicodinium is also quite similar in its morphology to the zygospores of zygnematacean green algae, such as the extant species Spirogyra (Chlorophyta). Such zygospores with a fossil record in the Mesozoic and Cenozoic are e.g. Schizophacus (see Ensom et al. 2009...
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Series: The Micropalaeontological Society, Special Publications
Published: 01 January 2013
DOI: 10.1144/TMS5.9
EISBN: 9781862396500
... Otto Friedrich Müller (1773) and described in more detail in a posthumous publication (Müller 1786). Fifty years later, Christian Gottfried Ehrenberg described the first dinoflagellate cysts, assigned to the genus Xanthidium because of their similarities with the zygospores of freshwater desmids...
FIGURES
Series: The Micropalaeontological Society, Special Publications
Published: 01 January 2013
DOI: 10.1144/TMS5.12
EISBN: 9781862396500
... and especially abundant in lakes rich in other algal microfossils associated with eutrophic conditions, for example Pediastrum spp. and zygne-matacean zygospores (desmids). Fig. 1. (a) Micrograph of a theca of Peridinium inconspicuum Lemmermann exceptionally preserved in palynological preparations...
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Journal Article
Published: 27 July 2016
Geological Magazine (2016) 154 (5): 1022-1036.
Journal Article
Journal: Palynology
Published: 01 March 2016
Palynology (2016) 40 (1): 122-136.
... Paleoindian site in the Gulf of Mexico . Palynology . 36 : 234 – 253 . Yi S . 1997 . Zygnematacean zygospores and other freshwater algae from the Upper Cretaceous of the Yellow Sea Basin, southwest coast of Korea . Cretaceous Res . 18 : 515 – 544 . Zhu Y Bhattacharya JP Li W...
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Journal Article
Journal: Palynology
Published: 01 March 2016
Palynology (2016) 40 (1): 83-121.
... with autospores in coccoid-shaped algae. The zygocysts (= zygospores) are resistant, thick-walled and acanthomorphic, as observed in many extant microalgae ( van den Hoek et al. 1995 ; Raven et al. 2005 ; Van Westen & Coesel, 2014 ; see section 6 below). As inferred for Skiagia ( Moczydłowska 2010...
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Journal Article
Journal: Palynology
Published: 01 December 2011
Palynology (2011) 35 (2): 155-178.
... median and lateral keels, Corrugations run radially with alternating ribs and furrows. Ribs usually broader than furrows. Polar surface displays polar hub. Remarks. Fossil zygospores and aplanospores (asexual resting spores) of some of the eighteen genera of this group of unbranched filamentous...
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