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Comasphaeridium

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Journal Article
Published: 01 January 2009
Journal of Paleontology (2009) 83 (1): 30-44.
...) and the Yurtus Formation in the Aksu area (Tarim Block, northwestern China). Our study confirms the occurrence in these two formations of small acanthomorphic acritarchs characteristic of the basal Cambrian Asteridium – Comasphaeridium – Heliosphaeridium (ACH) assemblage. These acritarchs include abundant...
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( 1 )  Valeria lophostriata . ( 2–4 )
                  ‘ <b>Comasphaeridium</b> ’...
Published: 01 September 2016
Figure 4 ( 1 ) Valeria lophostriata . ( 2–4 ) ‘ Comasphaeridium ’ tonium. ( 5 ) Unnamed Acritarch sp. B. ( 6 ) Unnamed Acritarch sp. C. ( 7–11 ) Unnamed Acritarch sp. D: ( 7 ) white arrow indicates conical extension of vesicle
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All photomicrographs are SEM images. Figures 1–6.  <b>Comasphaeridium</b> mollicul...
in > Palynology
Published: 01 June 2011
Plate 4. All photomicrographs are SEM images. Figures 1–6. Comasphaeridium molliculum Moczydłowska 1988 . A single specimen shown at different angles of vision (figures 3, 6), and with some fragments enlarged (figures 1, 2, 4, 5). Figure 1. Enlarged fragment showing the cell wall thickness
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Figure  3. —Thin section photomicrographs of  <b>Comasphaeridium</b> annulare  ( 1...
Published: 01 January 2009
Figure 3. —Thin section photomicrographs of Comasphaeridium annulare ( 1 , lower specimen; 2 ), Heliosphaeridium ampliatum ( 1 , upper specimen; 3 – 4 ), and Yurtusia uniformis new gen. and n. sp. ( 5 – 16 ). For each illustrated specimen in this paper, thin section number, museum number
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The acritarch species  <b>Comasphaeridium</b> molliculum  Moczydłowska &amp;amp; Vidal...
Published: 01 July 2001
Figure 3. The acritarch species Comasphaeridium molliculum Moczydłowska & Vidal, 1988 (a–d) from the lower Grammajukku Formation at Bergmyrhobben. (a) PMU-SW-98-1/2.W/50/3. (b) PMU-SW-98-3/4.V/53/3. (c) PMU-SW-98-1/2.S/26/3. (d) PMU-SW-98-3/4.C/45/1. Scale bar in (d) is 15 μm for (a, d
Journal Article
Published: 13 February 2017
Geological Magazine (2017) 154 (6): 1217-1231.
...SOO YEUN AHN; MAOYAN ZHU Abstract The Asteridium–Heliosphaeridium–Comasphaeridium (AHC) acritarch assemblage is composed of common organic-walled microfossils in the basal Cambrian chert–phosphorite units in South China, indicating that the AHC assemblage can be a useful biostratigraphic tool...
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Journal Article
Published: 27 April 2016
Geological Magazine (2016) 154 (3): 571-590.
... and suggest attribution to Cambrian Stage 4. Acritarchs from the Somerset Street Member, in the middle of the formation, include Eliasum llaniscum and Comasphaeridium silesiense . This information adds new biochronological context to an ash bed in the Somerset Street Member previously dated as c . 510 Ma...
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Acritarchs from the Hanford Brook (a–d) and Forest Hills (e, f) formations ...
Published: 27 April 2016
Figure 9. Acritarchs from the Hanford Brook (a–d) and Forest Hills (e, f) formations at Hanford Brook. (a, d) Somerset Street Member, (b, c) Long Island Members. Scale bar is equivalent to 20 μm. (a) Comasphaeridium strigosum (Jankauskas) Downie, 1982
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All photomicrographs were taken using interference contrast light transmitt...
in > Palynology
Published: 01 June 2011
Plate 3. All photomicrographs were taken using interference contrast light transmitted microscope. The scale bar in figure 1 is 12 μm for 1, 2; 15 μm for 3, 4; 10 μm for figures 5, 6. Figures 1, 2. Comasphaeridium molliculum Moczydłowska 1988 . 1, Specimen K/39/2. 2, Specimen M/45. Figures 3–5
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Acritarchs from the uppermost part of the Eskasoni Formation (A, C, E, F), ...
Published: 22 December 2011
Fig. 5. Acritarchs from the uppermost part of the Eskasoni Formation (A, C, E, F), and the Dugald Formation (B, D, G), Dugald Brook area. Scale bar = 20 μm. (A) Heliosphaeridium notatum (Volkova) Moczydłowska, 1991. Bo09:21; NSM010GF041.003/A; R-26-3. (B) Comasphaeridium silesiense Moczydłowska
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Acritarchs from the Hanford Brook Formation at Hanford Brook. (a, c) Somers...
Published: 27 April 2016
, F-48-2. (b) Comasphaeridium maximum Palacios, 2015 , Hanf 12:12, NBMG15594:001, N-38-1. (c) Asteridium lanatum (Volkova) Moczydłowska, 1991 , cluster of up to 30 specimens, Hanf 09:5, NBMG15582:001, Y-48-3.
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Acritarchs from the Hell's Mouth Formation, St Tudwal's Peninsula, Wales. S...
Published: 27 April 2016
, UexWal 001:002, V-17-4 (c) Comasphaeridium silesiense Moczydłowska, 1998 , TUD-2, UexWal 001:003, K-17-2-4. (d) Retisphaeridium lechistanium Jachowicz-Zdanowska, 2013 , TUD-2, UexWal 002:001, B-43-4. (e) Retisphaeridium dichamerum Staplin, Jansonius & Pocock, 1965 , TUD-2
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Fig. 1.  Dictyotidium deflandrei  ( Stockmans &amp; Willière, 1963 ) comb. ...
Published: 01 May 2002
out from the process bases, × 2000; 3, large linear rupture excystment opening, × 1250; 4, irregular rugulate ornament (R), × 2000. Fig. 5. Comasphaeridium williereae ( Deflandre & Deflandre-Rigaud, 1965 ex Lister, 1970 ) Sarjeant & Stancliffe, 1994, holotype, preparation 1164, × 1250
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Phytoplankton from the Grammajukku Formation. (a, e)  Globosphaeridium ceri...
Published: 01 July 2001
Figure 5. Phytoplankton from the Grammajukku Formation. (a, e) Globosphaeridium cerinum ( Volkova, 1968 ) Moczydłowska, 1991 . (a) PMU-SW-98-1/2.Z/31/2. (e) PMU-SW-98-3/4.F/43/1. (b) Pterospermopsimorpha wolynica Kirjanov, 1974 . PMU-SW-98-1/2.F/48/2. (c) Comasphaeridium mackenzianum
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All scale bars represent 20  μ m when not specified. Figures 1, 4, 7–12 wer...
in > Palynology
Published: 01 June 2011
Plate 4. All scale bars represent 20 μ m when not specified. Figures 1, 4, 7–12 were taken using plain transmitted light; figures 2–3 and 5–6 were taken using the SEM. The sample/slide numbers and the England Finder coordinates are indicated for all specimens. Figure 1. Comasphaeridium
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Litho-, bio-, and chemo-stratigraphic data from Lijiagou (A), Shizhonggou (...
in > Geology
Published: 28 February 2019
assemblage zone ( A.t. - P.a. ) ( Steiner et al., 2007 ) and acritarch Asteridium - Heliosphaeridium - Comasphaeridium assemblage zone ( AHC ) ( Yao et al., 2005 ; Yin, 1987 ) have been reported from the Kuanchuanpu Formation at Lijiagou and Shizhonggou. Basal Cambrian negative carbon isotope excursion
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All scale bars represent 20  μ m when not specified. Figures 1–2, 5–8 and 1...
in > Palynology
Published: 01 June 2011
. VA 38 (313.2 m)/SEM stub. Figure 8. Comasphaeridium williereae (Deflandre & Deflandre-Rigaud 1965 ex Lister 1970 ) Sarjeant & Stancliffe 1994. VA 46 (345.6 m)/1, R23/3. Figure 10. Dorsennidium sp. cf. D. europaeum (Stockmans & Willière 1960) Sarjeant & Stancliffe 1994. VA 46
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All scale bars represent 20  μ m when not specified. Figures 1–2, 5–8 and 1...
in > Palynology
Published: 01 June 2011
. Comasphaeridium sp. A; VA 46 (345.6 m)/1, G32/3. Figure 2. Multiplicisphaeridium ramispinosum Staplin 1961. VA 46 (345.6 m)/1, L32/1. Figure 3. Multiplicisphaeridium ramispinosum Staplin 1961. VA 38 (313.2 m)/SEM stub. Figures 4, 5. Hoegklintia visbyensis (Eisenack 1959) Dorning 1981. VA 38 (313.2 m)/1
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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
Journal Article
Published: 01 May 2002
Journal of Micropalaeontology (2002) 21 (1): 87-94.
... out from the process bases, × 2000; 3, large linear rupture excystment opening, × 1250; 4, irregular rugulate ornament (R), × 2000. Fig. 5. Comasphaeridium williereae ( Deflandre & Deflandre-Rigaud, 1965 ex Lister, 1970 ) Sarjeant & Stancliffe, 1994, holotype, preparation 1164, × 1250...
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