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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 Available to Purchase

Peter A. Siver, Jordan Bishop, Anne Lott, Alexander P. Wolfe
Published: 28 April 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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View PDF for article title, Heteropolar eunotioid diatoms (Bacillariophyceae) were common in the North American Arctic during the middle Eocene
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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 of the helictoglossa for A. kimberlitica. Fig. B is the holotype specimen for Actinella hickeyi and fig. M the holotype specimen for A. kimberlitica. Scale bar 10 µm.

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

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

PETER A. SIVER, ALEXANDER P. WOLFE
Journal: PALAIOS
Published: 01 March 2009
PALAIOS (2009) 24 (3): 192–198.
DOI: https://doi.org/10.2110/palo.2007-p07-077r
... 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...
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View PDF for article title, TROPICAL OCHROPHYTE ALGAE FROM THE EOCENE OF NORTHERN CANADA: A BIOGEOGRAPHIC RESPONSE TO PAST GLOBAL WARMING
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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.

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

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.
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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 surface. fig. C. Whole frustule showing the positions of rimoportulae on opposite ends of each valve (arrows). fig. D. Close-up of the foot pole of the specimen in C showing details of the copulae. Note the terminal pore on the distal raphe fissure. fig. E. Raphe slit positioned completely on the mantle. Note the large pores on both the distal and proximal ends of the raphe, the series of small closely spaced striae below the raphe, the rimoportula, and the thickened and extended end of the valvocopula. fig. F. Close-up of a head pole depicting the distal raphe fissure terminating close to the apex near the valve margin. Scale bars 10 µm (A and C), 5 µm (B) and 2 µm (D–F).

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

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
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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 to the ventral surface near the apex, and the shallow pseudoseptum. Scale bars 5 µm (C) and 2 µm (A–B, D).

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

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
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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 foot pole (arrow on A). fig. D. Whole frustule depicting both the valve and ventral girdle view. Note the slight rhomboidal shape in girdle view at the foot pole (arrow). fig. E. Internal view of a valve. Note the apical position of the rimoportula (arrow). fig. F. Close-up of the foot pole showing the small helictoglossa, position of the rimoportula (arrow), and the thickened portion of the mantle forming the shallow pseudoseptum around the apex. Scale bars 10 µm (C–E) and 5 µm (A–B, F).

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

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
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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 in B showing the raphe and terminal position of the rimoportula (arrow). figs D–F. Scanning electron micrographs of A. sp. 1: D, specimen depicting the long, slender and tapering nature of the valve. Note the bending of the valve on the foot pole (arrow); E–F, close-ups of the head (E) and foot (F) poles of the specimen in D. Note the bending of the distal raphe fissure up on to the valve face and the hyaline zone surrounding the distal end of the raphe. In F, black arrow indicates the rimoportula, while the white arrows denote the position of the axial area along the ventral margin. Scale bars 10 µm (D), 5 µm (A–B) and 2 µm (C, E–F).

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

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
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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 surface on the valve face. C–D) Internal (C) and external (D) views of the foot pole. Note the position of the helictoglossa (C) and the presence of a rimoportula on the valve (D). E–F) Internal views depicting overall valve shape, raphe structure, and the helictoglossae. G–H) Internal (G) and external (H) views of the head pole depicting the position of the helictoglossa and rimoportula. Scale bars = 2 μm in C–H; 5μm in A–B)

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

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
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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 euglyphid, Scutiglypha Foissner and Schiller; and (E) synurophyte scale from Mallomonas schumachii Siver.

Siliceous microfossils uncovered in rocks from the Giraffe (A–C) and Wombat... Available to Purchase

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
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Results of a SIMPER analysis identifying the organisms that contribute the ... Open Access

Published: 01 March 2023
the % contribution column represents a cumulative % contribution. 1 Includes multiple species of Eunotia and Actinella .
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Results of a SIMPER analysis identifying the organisms that contribute the ... Open Access

Published: 01 March 2023
under the % contribution column represents a cumulative % contribution. 1 Includes multiple species of Eunotia and Actinella .
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Results of a SIMPER analysis identifying the organisms that contribute the ... Open Access

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

Peter A. Siver, Anne Marie Lott
Published: 01 March 2023
Journal of Paleontology (2023) 97 (2): 271–291.
DOI: https://doi.org/10.1017/jpa.2022.101
... the % contribution column represents a cumulative % contribution. 1 Includes multiple species of Eunotia and Actinella . ...
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View PDF for article title, History of the Giraffe Pipe locality inferred from microfossil remains: a thriving freshwater ecosystem near the Arctic Circle during the warm Eocene
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Rock-forming taxa of the Sergeevskii diatomite: a, general view of the diatomite, SEM; b, Staurosira construens var. venter (Ehr.) Grun., SEM; c, g,Aulacoseira italica (Ehr.) Sim. (c, LM; g, SEM); d, f, C. aff. australica A. S. (d, LM; f, SEM), e, Cymbella aspera (Ehr.) Cl., SM; h, Actinella brasiliensis Grun., LM.

Rock-forming taxa of the Sergeevskii diatomite: a , general view of the di... Available to Purchase

Published: 01 June 2015
aspera (Ehr.) Cl., SM; h , Actinella brasiliensis Grun., LM.
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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 of (5) Mallomonas insignis, (6) Chrysosphaerella Lauterborn, (7) Mallomonas porifera Siver and Wolfe, 2005b, (8) Mallomonas bangladeschica (Takahashi and Hayakawa, 1979) Wujek and Timpano, 1984, and (9) Synura cronbergiae Siver, 2013; (10) sponge spicule; (11, 12) plates of euglyphids; (13) scale of Synura recurvata Siver and Wolfe, 2005b; (14) filament of Aulacoseira giraffensis; heliozoan scales of (15) Choanocystis, (16) Acanthocystis, and (17) Raineriophrys; (18) scale of the paraphysomonad, Lepidochromonas, and; (19) scale of Rabdiophrys. Scale bars are located to the right side of each specimen. Scale bars = (1, 4, 10) 10 μm; (2, 3, 5, 9, 13, 15–17) 2 μm; (6, 8, 19) 1 μm; (7, 11); (12) 5 μm; (14) 15 μm; (18) 500 nm 3 μm.

Scanning electron micrographs of microfossil specimens representing 19 of t... Open Access

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

F.I. Enikeev
Published: 01 August 2008
Russ. Geol. Geophys. (2008) 49 (8): 602–610.
DOI: https://doi.org/10.1016/j.rgg.2007.11.013
.... 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...
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View PDF for article title, The Late Cenozoic of northern Transbaikalia and paleoclimates of southern East Siberia
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Diatom characteristics of the Far East siliceous organogenic deposits Available to Purchase

A.S. Avramenko, M.V. Cherepanova, V.S. Pushkar’, S.B. Yarusova
Published: 01 June 2015
Russ. Geol. Geophys. (2015) 56 (6): 947–958.
DOI: https://doi.org/10.1016/j.rgg.2015.05.010
... aspera (Ehr.) Cl., SM; h , Actinella brasiliensis Grun., LM. ...
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Biostratigraphy and deposition environments of the Middle-Late Miocene volcanosedimentary section in the Dzhilinda basin, Western Transbaikalia Available to Purchase

G.P. Chernyaeva, N.A. Lyamina, S.V. Rasskazov, I.N. Rezanov, V.V. Savinova
Published: 01 April 2007
Russ. Geol. Geophys. (2007) 48 (4): 361–370.
DOI: https://doi.org/10.1016/j.rgg.2006.01.002
.... 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...
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View PDF for article title, Biostratigraphy and deposition environments of the Middle-Late Miocene volcanosedimentary section in the Dzhilinda basin, Western Transbaikalia
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Journal Article

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

PETER A. SIVER, MARIA VELEZ, MONICA CLIVETI, PIER BINDA
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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