The Flagellates

Deflandre, Georges

doi:10.2307/1483835

Cited by 4 publications

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“…Group ACRITARCHA Evitt 1963 Genus Palaeostomocystis Deflandre 1937 Palaeostomocystis reticulata Deflandre 1937 (Plate 1, figs. 1-2; Text- Figure 4) Discussion.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…1-2; Text- Figure 4) Discussion. The genus Palaeostomocystis was first established by Deflandre in 1937 from Cretaceous sediments of France (Text- Figure 4, top two drawings from the original protologue of Deflandre, 1937). The type species Palaeostomocystis reticulata Deflandre 1937 was defined as having a small organic-walled vesicle, always characterized by the presence of a pore of more-or-less large opening that sometimes exhibits a variably developed collar.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…It has a circular, rimmed macro-pylome and an ovoidal to obtuse-coniform, unilayered, thin-walled vesicle with circular to oval equatorial outline. Deflandre 1937 (Plate 1, fig. A partly detached macro-operculum usually occurs in the interior of the vesicle (Roncaglia, 2004).…”

Section: Palaeostomocystis Subtilitheca Roncaglia 2004mentioning

confidence: 99%

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Species of the Acritarch Genus Palaeostomocystis: Potential Indicators of Neritic Subpolar to Polar Environments in Antarctica During the Cenozoic

Warny

2009

Palynology

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A palynological analysis was undertaken on 16 samples from seven piston cores collected along two offshore transects near Seymour and James Ross Islands. Diverse assemblages of reworked marine microplankton (including organic-walled dinoflagellate cysts, cymatiosphaerids, leiospheres, and other acritarchs) and terrestrial palynomorphs (including pollen and spores) were recovered from glacio-marine sediments of late Pleistocene age. Among the reworked taxa, four species belonging to the acritarch genus Palaeostomocystis Deflandre 1937 comprise up to 17% of all palynomorphs. Highest abundances were recorded from sites close to the coast. The potential use of Palaeostomocystis as a proxy for early ice-sheet development on the Antarctic margins is evaluated in light of earlier studies. This evaluation suggests that the high abundances of Palaeostomocystis on the Antarctic Peninsula reflect neritic-type environments (shallow waters, bay-like areas, or marginal seas) and sub-polar to polar conditions as exist in the Bering Sea, Greenland margins, and other subarctic to arctic areas today.

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“…Group ACRITARCHA Evitt 1963 Genus Palaeostomocystis Deflandre 1937 Palaeostomocystis reticulata Deflandre 1937 (Plate 1, figs. 1-2; Text- Figure 4) Discussion.…”

Section: Systematic Paleontologymentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

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Species of the Acritarch Genus Palaeostomocystis: Potential Indicators of Neritic Subpolar to Polar Environments in Antarctica During the Cenozoic

Warny

2009

Palynology

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“…Many of the most important early and mid Oxfordian dinoflagellate cysts were described in this landmark publication (see also Albert and Wharton, 1987). Six of the most important species formally described in Deflandre (1939), including Gymnodinium (now 6 PALYNOLOGY, VOLUME 26 -2002 Scriniodinium) crystallinum, were earlier illustrated, but not formally described, by Deflandre (1938). Six of the most important species formally described in Deflandre (1939), including Gymnodinium (now 6 PALYNOLOGY, VOLUME 26 -2002 Scriniodinium) crystallinum, were earlier illustrated, but not formally described, by Deflandre (1938).…”

Section: Introductionmentioning

confidence: 99%

“…nov. Endoscrinium asymmetricum Riding 1987 Endoscrinium attadalense (Cookson & Eisenack 1958) comb. 1983 A review of the Jurassic dinocyst genera Ctenidodinium Deflandre 1938and Dichadogonyaulax Sarjeant 1966. Journal of the University of Sheffield Geological Society, 7.5: 243-261.…”

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confidence: 99%

A Review of Scriniodinium Klement 1957, Endoscrinium (Klement 1960) Vozzhennikova 1967 and Related Dinoflagellate Cyst Taxa

Riding

Fensome

2002

Palynology

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Specimens of the well known and distinctive Jurassic (typically Oxfordian) dinoflagellate cyst species Scriniodinium crystallinum from Australia and New Zealand vary from being nonparatabulate to paratabulate. Where present, the paratabulation, which is manifested by low parasutural ridges on the periphragm, shows a clear dextral torsion, indicating affinity with the gonyaulacacean subfamily Cribroperidinioideae. Other species of Scriniodinium, such as S. pharo and S. playfordii confirm that this genus unequivocally belongs in the subfamily Cribroperidinioideae. Scriniodinium and S. crystallinum are both emended in order to note the cribroperidinioid paratabulation. Endoscrinium, however, exhibits neutral torsion and thus belongs in the subfamily Leptodinioideae. Endoscrinium and its type, E. galeritum, are emended to note this paratabulation style. On the basis of this clear paratabulation difference between Scriniodinium and Endoscrinium, ten species are transferred to the most appropriate genus. Endoscrinium anceps is transferred to Scriniodinium as it has dextral torsion. Endoscrinium acroferum, E. attadalense, E? hauterivianum, E. heikeae, E. indicum, E. irregulare, E? novissimum, E. obscurum and E. reticulatum are all new combinations of taxa with neutral torsion which were previously placed in Scriniodinium. Additionally, Aldorfia warringtonii is transferred to Apteodinium because it displays dextral torsion. Scriniodinium and Endoscrinium peaked worldwide during the late Callovian to early Kimmeridgian. There are differences in the stratigraphical ranges of species of Scriniodinium and Endoscrinium between the Northern and Southern hemispheres. For example, Scriniodinium crystallinum has a younger range top in Australasia than in Europe. However, there are many strong global consistencies with these two important genera and some potential evolutionary trends have been discerned. Endoscrinium has the older range base and this is consistent with the phylogeny of the subfamilies Leptodinioideae and Cribroperidinioideae. c c 0 A B 50 µm 1p '

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The John Williams Index of Palaeopalynology

et al. 2012

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Occasionally (and fortunately), circumstances and timing combine to allow an individual, almost singlehandedly, to generate a paradigm shift in his or her chosen field of inquiry. William R. ('Bill') Evitt (1923À2009) was such a person. During his career as a palaeontologist, Bill Evitt made lasting and profound contributions to the study of both dinoflagellates and trilobites. He had a distinguished, long and varied career, researching first trilobites and techniques in palaeontology before moving on to marine palynomorphs. Bill is undoubtedly best known for his work on dinoflagellates, especially their resting cysts. He worked at three major US universities and spent a highly significant period in the oil industry. Bill's early profound interest in the natural sciences was actively encouraged both by his parents and at school. His alma mater was Johns Hopkins University where, commencing in 1940, he studied chemistry and geology as an undergraduate. He quickly developed a strong vocation in the earth sciences, and became fascinated by the fossiliferous Lower Palaeozoic strata of the northwestern United States. Bill commenced a PhD project on silicified Middle Ordovician trilobites from Virginia in 1943. His doctoral research was interrupted by military service during World War II; Bill served as an aerial photograph interpreter in China in 1944 and 1945, and received the Bronze Star for his excellent work. Upon demobilisation from the US Army Air Force, he resumed work on his PhD and was given significant teaching duties at Johns Hopkins, which he thoroughly enjoyed. He accepted his first professional position, as an instructor in sedimentary geology, at the University of Rochester in late 1948. Here Bill supervised his first two graduate students, and shared a great cameraderie with a highly motivated student body which largely comprised World War II veterans. At Rochester, Bill continued his trilobite research, and was the editor of the Journal of Paleontology between 1953 and. Seeking a new challenge, he joined the Carter Oil Company in Tulsa, Oklahoma, during 1956. This brought about an irrevocable realignment of his research interests from trilobites to marine palynology. He undertook basic research on aquatic palynomorphs in a very well-resourced laboratory under the direction of one of his most influential mentors, William S. 'Bill' Hoffmeister. Bill Evitt visited the influential European palynologists Georges Deflandre and Alfred Eisenack during late 1959 and, while in Tulsa, first developed several groundbreaking hypotheses. He soon realised that the distinctive morphology of certain fossil dinoflagellates, notably the archaeopyle, meant that they represent the resting cyst stage of the life cycle. The archaeopyle clearly allows the excystment of the cell contents, and comprises one or more plate areas. Bill also concluded that spine-bearing palynomorphs, then called hystrichospheres, could be divided into two groups. The largely Palaeozoic spine-bearing palynomorphs are of uncertain biological affin...

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The Flagellates

Cited by 4 publications

References 0 publications

Species of the Acritarch Genus Palaeostomocystis: Potential Indicators of Neritic Subpolar to Polar Environments in Antarctica During the Cenozoic

Species of the Acritarch Genus Palaeostomocystis: Potential Indicators of Neritic Subpolar to Polar Environments in Antarctica During the Cenozoic

A Review of Scriniodinium Klement 1957, Endoscrinium (Klement 1960) Vozzhennikova 1967 and Related Dinoflagellate Cyst Taxa

The John Williams Index of Palaeopalynology

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