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Actinella

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Journal Article

Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene

Published: 01 July 2015
Journal of Micropalaeontology (2015) 34 (2): 151-163.
DOI: https://doi.org/10.1144/jmpaleo2014-005
...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...
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figs A–H . Light micrographs of <b>Actinella</b> hickeyi sp. nov.; figs I–O . ...

figs A–H . Light micrographs of Actinella hickeyi sp. nov.; figs I–O . ...

Published: 01 July 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
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Light micrographs of <b>Actinella</b> goodwinii sp. nov., depicting a size dimin...

Light micrographs of Actinella goodwinii sp. nov., depicting a size dimin...

Published: 01 July 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.
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Scanning electron micrographs of <b>Actinella</b> hickeyi sp. nov.: figs A–B. ...

Scanning electron micrographs of Actinella hickeyi sp. nov.: figs A–B. ...

Published: 01 July 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
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Scanning electron micrographs of <b>Actinella</b> hickeyi sp. nov., depicting in...

Scanning electron micrographs of Actinella hickeyi sp. nov., depicting in...

Published: 01 July 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
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Scanning electron micrographs of <b>Actinella</b> goodwinii . figs A–C. Valves ...

Scanning electron micrographs of Actinella goodwinii . figs A–C. Valves ...

Published: 01 July 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
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figs A–C. Scanning electron micrographs of <b>Actinella</b> kimberlitica sp. no...

figs A–C. Scanning electron micrographs of Actinella kimberlitica sp. no...

Published: 01 July 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
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FIGURE 3 —Valves of <b>Actinella</b> morphotype Giraffe 1 from Giraffe Pipe sedi...

FIGURE 3 —Valves of Actinella morphotype Giraffe 1 from Giraffe Pipe sedi...

in > 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
Journal Article

TROPICAL OCHROPHYTE ALGAE FROM THE EOCENE OF NORTHERN CANADA: A BIOGEOGRAPHIC RESPONSE TO PAST GLOBAL WARMING

Journal: PALAIOS
Published: 01 March 2009
PALAIOS (2009) 24 (3): 192-198.
DOI: https://doi.org/10.2110/palo.2007-p07-077r
...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...
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Journal Article

EARLY FRESHWATER DIATOMS FROM THE UPPER CRETACEOUS BATTLE FORMATION IN WESTERN CANADA

Journal: PALAIOS
Published: 21 December 2018
PALAIOS (2018) 33 (12): 525-534.
DOI: https://doi.org/10.2110/palo.2018.045
...., 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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