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1-20 OF 23 RESULTS FOR
Actinella
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Journal Article
Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene Available to Purchase
Journal: Journal of Micropalaeontology
Publisher: Geological Society of London
Published: 28 April 2015
Journal of Micropalaeontology (2015) 34 (2): 151–163.
...Peter A. Siver; Jordan Bishop; Anne Lott; Alexander P. Wolfe Abstract Eunotioid diatoms that express asymmetry in both the apical and transapical axes, forming heteropolar valves, are generally placed in the genus Actinella . The degree of heteropolarity varies between species, ranging from subtle...
Image
figs A–H . Light micrographs of Actinella hickeyi sp. nov.; figs I–O . ... Available to Purchase
in Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
> Journal of Micropalaeontology
Published: 28 April 2015
Explanation of Plate 1. figs A–H . Light micrographs of Actinella hickeyi sp. nov.; figs I–O . A. kimberlitica sp. nov.; figs P–Q . A . sp. 2. Note the heteropolar nature of the valve for all three taxa, the widely spaced striae for A. hickeyi , and the incised nature
Journal Article
TROPICAL OCHROPHYTE ALGAE FROM THE EOCENE OF NORTHERN CANADA: A BIOGEOGRAPHIC RESPONSE TO PAST GLOBAL WARMING Available to Purchase
Journal: PALAIOS
Publisher: SEPM Society for Sedimentary Geology
Published: 01 March 2009
PALAIOS (2009) 24 (3): 192–198.
... genus Actinella is also well represented in these sediments, again with the most comparable extant congeners found in tropical to subtropical localities, particularly in the Southern Hemisphere. We surmise that fundamental biogeographic reorganizations among lacustrine algae took place during Eocene...
Image
Light micrographs of Actinella goodwinii sp. nov., depicting a size dimin... Available to Purchase
in Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
> Journal of Micropalaeontology
Published: 28 April 2015
Explanation of Plate 2. Light micrographs of Actinella goodwinii sp. nov., depicting a size diminution series. Note the extended and narrower foot pole and even distribution of striae. Fig. F is the holotype specimen. Scale bar 10 µm.
Image
Scanning electron micrographs of Actinella hickeyi sp. nov.: figs A–B. ... Available to Purchase
in Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
> Journal of Micropalaeontology
Published: 28 April 2015
Explanation of Plate 3. Scanning electron micrographs of Actinella hickeyi sp. nov.: figs A–B. External and internal views depicting the distribution of striae and heteropolar nature of the valve. Insert in B shows the arrangement of areolae within shallow linear depressions on the internal
Image
Scanning electron micrographs of Actinella hickeyi sp. nov., depicting in... Available to Purchase
in Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
> Journal of Micropalaeontology
Published: 28 April 2015
Explanation of Plate 4. Scanning electron micrographs of Actinella hickeyi sp. nov., depicting internal structure: figs A–C. the foot pole; fig. D. the head pole. Note the well-developed helictoglossae that often extend halfway across the valve face, the location of the rimoportulae closer
Image
Scanning electron micrographs of Actinella goodwinii . figs A–C. Valves ... Available to Purchase
in Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
> Journal of Micropalaeontology
Published: 28 April 2015
Explanation of Plate 5. Scanning electron micrographs of Actinella goodwinii . figs A–C. Valves depicting the valve face (A–B), dorsal mantle (A) and ventral mantle (C). Note the deep width of the mantle, the small raphe slits positioned on the upper part of the mantle, and the outward-angled
Image
figs A–C. Scanning electron micrographs of Actinella kimberlitica sp. no... Available to Purchase
in Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
> Journal of Micropalaeontology
Published: 28 April 2015
Explanation of Plate 6. figs A–C. Scanning electron micrographs of Actinella kimberlitica sp. nov.: A , external and B , internal views showing the arrangement of striae and position of the raphe slits. The foot poles are depicted with arrows; C , close-up of the foot pole of the specimen
Image
FIGURE 3 —Valves of Actinella morphotype Giraffe 1 from Giraffe Pipe sedi... Available to Purchase
in TROPICAL OCHROPHYTE ALGAE FROM THE EOCENE OF NORTHERN CANADA: A BIOGEOGRAPHIC RESPONSE TO PAST GLOBAL WARMING
> PALAIOS
Published: 01 March 2009
FIGURE 3 —Valves of Actinella morphotype Giraffe 1 from Giraffe Pipe sediments (A–D, G–H) and the modern species, A. parva , from Lake Judd, Tasmania (E–F). A– B) Internal (A) and external (B) views of whole valves. Note the varying lengths of the raphe slits and their position along the ventral
Image
Siliceous microfossils uncovered in rocks from the Giraffe (A–C) and Wombat... Available to Purchase
in Tephra zircon U-Pb geochronology of kimberlite maar sedimentary fills in subarctic Canada: Implications for Eocene paleoclimate and Late Cretaceous paleogeography
> GSA Bulletin
Published: 01 March 2024
Figure 2. Siliceous microfossils uncovered in rocks from the Giraffe (A–C) and Wombat cores (D, E). (A) Valve of the diatom Actinella goodwinii Siver, Bishop, Wolfe and Lott; (B) synurophyte scale from the genus Mallomonas Perty; (C) chrysophyte cyst; (D) plate belonging to the testate
Image
Results of a SIMPER analysis identifying the organisms that contribute the ... Open Access
in History of the Giraffe Pipe locality inferred from microfossil remains: a thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
> Journal of Paleontology
Published: 01 March 2023
the % contribution column represents a cumulative % contribution. 1 Includes multiple species of Eunotia and Actinella .
Image
Results of a SIMPER analysis identifying the organisms that contribute the ... Open Access
in History of the Giraffe Pipe locality inferred from microfossil remains: a thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
> Journal of Paleontology
Published: 01 March 2023
under the % contribution column represents a cumulative % contribution. 1 Includes multiple species of Eunotia and Actinella .
Image
Results of a SIMPER analysis identifying the organisms that contribute the ... Open Access
in History of the Giraffe Pipe locality inferred from microfossil remains: a thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
> Journal of Paleontology
Published: 01 March 2023
the % contribution column represents a cumulative % contribution. 1 Aulacoseira giraffensis accounted for 96% of the Centric diatom category. 2 Includes multiple species of Eunotia and Actinella .
Journal Article
History of the Giraffe Pipe locality inferred from microfossil remains: a thriving freshwater ecosystem near the Arctic Circle during the warm Eocene Open Access
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 March 2023
Journal of Paleontology (2023) 97 (2): 271–291.
... the % contribution column represents a cumulative % contribution. 1 Includes multiple species of Eunotia and Actinella . ...
Image
Rock-forming taxa of the Sergeevskii diatomite: a , general view of the di... Available to Purchase
in Diatom characteristics of the Far East siliceous organogenic deposits
> Russian Geology and Geophysics
Published: 01 June 2015
aspera (Ehr.) Cl., SM; h , Actinella brasiliensis Grun., LM.
Image
Scanning electron micrographs of microfossil specimens representing 19 of t... Open Access
in History of the Giraffe Pipe locality inferred from microfossil remains: a thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
> Journal of Paleontology
Published: 01 March 2023
Figure 3. Scanning electron micrographs of microfossil specimens representing 19 of the most important organisms uncovered in the Giraffe Pipe core. ( 1 ) Eunotioid diatom Actinella ; ( 2 ) chrysophyte cyst; ( 3 ) scale of Mallomonas lychenensis ; ( 4 ) Botryococcus colony; synurophyte scales
Journal Article
The Late Cenozoic of northern Transbaikalia and paleoclimates of southern East Siberia Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 August 2008
Russ. Geol. Geophys. (2008) 49 (8): 602–610.
.... sp. (af. canadensis ), M. distans (Ehr) Kutz., M. distans var. alpigena Grun. et var., M. italica (Ehr) Kutz., M. af. praegranulata Jouse, Enotia robusta Ralfs et var., E. af. revoluta A. Cl., Actinella brasiliensis Grun., Pontodiscus af. gorbunovii Sheshukova, Tetracyclus...
Journal Article
Diatom characteristics of the Far East siliceous organogenic deposits Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 June 2015
Russ. Geol. Geophys. (2015) 56 (6): 947–958.
... aspera (Ehr.) Cl., SM; h , Actinella brasiliensis Grun., LM. ...
Journal Article
Biostratigraphy and deposition environments of the Middle-Late Miocene volcanosedimentary section in the Dzhilinda basin, Western Transbaikalia Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 April 2007
Russ. Geol. Geophys. (2007) 48 (4): 361–370.
.... The lower limnic section (from 215 to 195 m in well 82) deposited in a moderately warm and wet climate. The lake had a large pelagic zone inhabited by diatom plankton, and benthic species lived near the shore. The presence of warm-water Actinella brasiliensis Grunow which is extant in lakes of Korea...
Journal Article
EARLY FRESHWATER DIATOMS FROM THE UPPER CRETACEOUS BATTLE FORMATION IN WESTERN CANADA Available to Purchase
Journal: PALAIOS
Publisher: SEPM Society for Sedimentary Geology
Published: 21 December 2018
PALAIOS (2018) 33 (12): 525–534.
....,
2010 ,
Taxonomic descriptions and evolutionary implications of middle Eocene pennate diatoms representing the extant genera Oxyneis, Actinella and Nupela (Bacillariophyceae) :
Plant Ecology and Evolution
, v. 143, v. 340–351.
Siver,
P.A...
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