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Skiagia

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Journal Article
Published: 01 March 2010
Journal of Paleontology (2010) 84 (2): 216–230.
... from the cyst. Vegetative cells, cysts, and endocysts are distinguished, and the hypothetical reconstruction of a complex life cycle with the alternation of sexual and asexual generations is proposed. Acritarchs from the Skiagia -plexus are cysts, and likely zygotes in the sexual generation, which...
FIGURES | View All (5)
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All photomicrographs are SEM images. Figures 1–6.  <b>Skiagia</b> ornata  ( Volkov...
in > Palynology
Published: 01 June 2011
Plate 14. All photomicrographs are SEM images. Figures 1–6. Skiagia ornata ( Volkova 1968 ) Downie 1982 . Figures 1–4. A single specimen shown at different angles of vision (2, 3), and with some fragments of the processes enlarged to demonstrate their funnel-shaped tips (1, 4). SEM stub ES-Ko
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Figure 4. Early Cambrian  <b>Skiagia</b> ornata  (Volkova, 1968)  Downie, 1982 , f...
Published: 01 March 2010
Figure 4. Early Cambrian Skiagia ornata (Volkova, 1968) Downie, 1982 , from the Yalkalpo 2 borehole, South Australia, containing the internal body and interpreted to be the maturing acanthomorphic cyst with the endocyst. 1 , specimen from slide 7036RS137-3, D30; 2 , specimen from slide
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Figure 3. Early Cambrian  <b>Skiagia</b> ornata  (Volkova, 1968)  Downie, 1982 , i...
Published: 01 March 2010
Figure 3. Early Cambrian Skiagia ornata (Volkova, 1968) Downie, 1982 , interpreted to be a cyst in the complex life cycle of microalga. All specimens derive from the Lükati Formation, Estonia. 1 , specimen Ko-96-5 (S/27/4), showing acanthomorphic vesicle without opening, in an immature
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Figure 2. Early Cambrian  <b>Skiagia</b> scottica  Downie, 1982 , interpreted to b...
Published: 01 March 2010
Figure 2. Early Cambrian Skiagia scottica Downie, 1982 , interpreted to be a cyst in the complex life cycle of microalga. The specimens are without the vesicle opening and represent immature developmental stage before the excystment structure was formed. 1–2 , specimens from the Buen Formation
Journal Article
Published: 01 July 2001
Geological Magazine (2001) 138 (4): 435–453.
... assemblages are recorded throughout the Grammajukku Formation. They are age-diagnostic for the Skiagia–Fimbriaglomerella acritarch Zone, time-equivalent to the Schmidtiellus mickwitzi trilobite Zone (the lower part of the formation), and the Heliosphaeridium–Skiagia acritarch Zone corresponding to the Holmia...
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Journal Article
Published: 01 June 1995
Journal of the Geological Society (1995) 152 (3): 499–510.
...) at Chekurovka, and a much poorer assemblage from Ulakhan-Aldyarkhay, indicate time-equivalence with the Heliosphaeridium dissimilare–Skiagia ciliosa acritarch Zone and the correlative Holmia kjerulfi trilobite Zone in Baltica. The bulk of the species turnover which is part of the Cambrian explosion, including...
Journal Article
Published: 27 April 2016
Geological Magazine (2017) 154 (3): 571–590.
... studies by providing the first detailed picture of changing acritarch associations close to the traditional lower–middle Cambrian boundary in Avalonia. Acritarchs from the St Martins Member, at the base of the succession, include Skiagia ciliosa, Heliosphaeridium notatum, H. longum and Liepaina plana...
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Journal Article
Journal: Palynology
Published: 01 March 2016
Palynology (2016) 40 (1): 83–121.
... ( Tanarium , Ancorosphaeridium , Densisphaera ), and dominant in the Cambrian ( Skiagia , Polygonium and many others) periods. * Email: malgo.vidal@pal.uu.se organic-walled microfossils Ediacaran Cambrian zygotic cysts phycoma Chlorophyceae Prasinophyceae The observation of modern...
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Journal Article
Published: 01 August 1995
Journal of the Geological Society (1995) 152 (4): 599–611.
... time difference of 17 ± 4 Ma between the top of the Stawatycze Formation and Lower Cambrian strata of the Heliosphaeridium dissimilare-Skiagia ciliosa acritarch Zone, the latter being time-equivalent to Middle Tommotian strata in northeastern Siberia, recently dated as 534.6 ± 0.5 Ma. The tuff from...
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Lower Cambrian phytoplankton from the Grammajukku Formation. (a, b)  Skiagi...
Published: 01 July 2001
Figure 4. Lower Cambrian phytoplankton from the Grammajukku Formation. (a, b) Skiagia ornata ( Volkova, 1968 ) Downie, 1982 . (a) PMU-SW-98-4/1.P/53/2. (b) PMU-SW-98-12/2.D/40/3. (c) Skiagia ciliosa ( Volkova, 1969 ) Downie, 1982 . PMU-SW-98-14/1.L/39/4. (d, f) Skiagia orbiculare
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Acritarchs from the St Martins Member, Hanford Brook Formation, Hanford Bro...
Published: 27 April 2016
Figure 5. Acritarchs from the St Martins Member, Hanford Brook Formation, Hanford Brook. Scale bar is equivalent to 20 μm. (a–c) Skiagia ciliosa (Volkova) Downie, 1982 . (a) Hanf 12:1, NBMG15584:001, V-31-1. (b) Hanf 12:3, NBMG15586:001, B-15-4 specimen
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All photomicrographs were taken using interference contrast light transmitt...
in > Palynology
Published: 01 June 2011
Plate 15. All photomicrographs were taken using interference contrast light transmitted microscope. The scale bar in figure 2 is 15 μm for all specimens illustrated. Figures 1–4. Skiagia scottica Downie 1982 . Specimens interpreted to be the cysts in a complex life cycle of green microalga
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Simplified stratigraphic sections of the Neoproterozoic–Lower Cambrian succ...
Published: 01 July 2001
. = Platysolenites antiquissimus faunal Zone, corresponding to the Asteridium tornatum – Comasphaeridium velvetum acritarch Zone, Schmid. = Schmidtiellus mickwitzi trilobite Zone to the Skiagia ornata – Fimbriaglomerella membranacea acritarch Zone, Holmia = Holmia kjerulfi trilobite Zone
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All photomicrographs were taken using interference contrast light transmitt...
in > Palynology
Published: 01 June 2011
Plate 12. All photomicrographs were taken using interference contrast light transmitted microscope. The scale bar in figure 1 is 15 μm for all specimens illustrated. Figures 1–4. Skiagia orbicularis ( Volkova 1968 ) Downie 1982 . Specimens showing the excystment structure by partial rupture
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Acritarchs from the uppermost part of the Eskasoni Formation (A, C, E, F), ...
Published: 22 December 2011
, 1998 . Bo09:17; NSM010GF041.009/B; B-30-4. (C) Comasphaeridium sp. Bo09:21; NSM010GF041.002/B; A-18-4. (D) Heliosphaeridium serridentatum Moczydłowska, 1998 . Bo09:17; NSM010GF041.009/C; H-25-3. (E, F) Skiagia sp. (E) Bo09:21; NSM010GF041.002/C; H-44-1. (F) Bo09:21; NSM010GF041.003/B; E-23. (G
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All photomicrographs are SEM images. Figures 1–3.  Archaeodiscina umbonulat...
in > Palynology
Published: 01 June 2011
-like thickening showing the radial folds extending gradually from the highly elevated central part (2), and the entire but plastically collapsed (inverted) inner body (3). SEM stub ES-Ko-4a, images 07 and 06, respectively. Skiagia orbicularis ( Volkova 1968 ) Downie 1982 . Specimen with short
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All photomicrographs were taken using interference contrast light transmitt...
in > Palynology
Published: 01 June 2011
Plate 11. All photomicrographs were taken using interference contrast light transmitted microscope. The scale bar in figure 1 is 15 μm for all specimens illustrated. Figures 1–6. Skiagia compressa ( Volkova 1968 ) Downie 1982 . Specimens showing the wavy outline of vesicle and clearly conical
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All photomicrographs were taken using interference contrast light transmitt...
in > Palynology
Published: 01 June 2011
Plate 13. All photomicrographs were taken using interference contrast light transmitted microscope. The scale bar in figure 3 is 15 μm for all specimens illustrated. Figures 1–6. Skiagia ornata ( Volkova 1968 ) Downie 1982 . Specimens interpreted to be encysted stages in a complex life cycle
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Figure 5. The reconstruction of a complex life cycle of microalgae with alt...
Published: 01 March 2010
Figure 5. The reconstruction of a complex life cycle of microalgae with alternating sexual and asexual generations and polymorphic developmental stages represented by microfossils from the Leiosphaeridia - and Skiagia -plexus. Numerical 1–6 indicate various stages in the morphogenesis of the cyst