Note sur les Archæomonadacées

Deflandre, Georges

doi:10.1080/00378941.1932.10833765

Cited by 6 publications

(2 citation statements)

References 1 publication

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“…List of calcareous nannofossil taxa encountered in the Petrich section, Bulgaria (according to Nannotax3: https://www.mikrotax.org/Nannotax3/) Ahmuellerella octoradiata (Górka) Reinhardt, 1966 Arkhangelskiella cymbiformis Vekshina, 1959 Biscutum constans (Górka) Black in Black and Barnes, 1959 Biscutum cf. melaniae (Górka) Reinhardt, 1969 Braarudosphaera bigelowii (Gran and Braarud) Deflandre, 1947 Broinsonia enormis (Shumenko) Manivit, 1971 Broinsonia parca constricta Hattner, Wind and Wise, 1980 Broinsonia parca parca (Stradner) Lentin and Williams, 1976 Chatangiella tripartita (Cookson and Eisenack) Lentin and Williams, 1976 Corradinisphaeridium horridum (Deflandre) Masure, 1986 Exochosphaeridium majus (Lejeune-Carpentier) Peyrot, 2011 Hystrichodinium pulchrum Deflandre, 1935 Hystrichosphaeridium duplum Lentin and Williams, 1989 Hystrichosphaeridium salpingophorum (Deflandre) Deflandre, 1937 emend. Davey and Williams, 1966 Hystrichosphaeridium tubiferum (Ehrenberg) Deflandre, 1937 Isabelidinium cooksoniae (Alberti) Lentin and Williams, 1977 Odontochitina porifera Cookson, 1956 Oligosphaeridium complex (White) Davey and Williams, 1966 Oligosphaeridium pulcherrimum (Deflandre and Cookson) Davey and Williams, 1966 Palaeohystrichophora infusorioides Deflandre, 1935 Pervosphaeridium monasteriense Yun, 1981 Pervosphaeridium pseudhystrichodinium (Deflandre) Yun, 1981 Pterodinium cingulatum (Wetzel) Below, 1981 Raetiaedinium truncigerum (Deflandre) Kirsch, 1991 Spiniferites membranaceus (Rossignol) Sarjeant, 1970 Spiniferites ramosus (Ehrenberg) Mantell, 1854 Spiniferites scabrosus (Clarke and Verdier) Lentin and Williams, 1975 Surculosphaeridium longifurcatum (Firtion) Davey, Downie, Sarjeant and Williams, 1966 Tanyosphaeridium regulare Davey and Williams, 1966…”

Section: Appendixmentioning

confidence: 99%

Acta Geologica Polonica

2022

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The Upper Cretaceous succession (Coniacian to lowermost Maastrichtian, with focus on the Campanian) at Petrich, Central Srednogorie Zone in Bulgaria, is described and calibrated stratigraphically based on nannofossils, dinoflagellate cysts and inoceramids. The following standard nannofossil zones and subzones are identified: UC10–UC11ab (middle to upper Coniacian), UC11c–UC12–UC13 (uppermost Coniacian to Santonian), UC14a (lowermost Campanian), UC14b TP–UC15c TP (lower Campanian to ‘middle’ Campanian), UC15d TP– UC15e TP (upper Campanian), UC16a TP (of Thibault et al. 2016; upper part of the upper Campanian), and UC16b (Campanian–Maastrichtian boundary). The base of the Campanian is defined by the FO of Broinsonia parca parca (Stradner) Bukry, 1969 and Calculites obscurus (Deflandre) Prins and Sissingh in Sissingh, 1977 (a morphotype with a wide central longitudinal suture). The Areoligera coronata dinoflagellate cyst Zone (upper lower Campanian to upper upper Campanian) is identified, corresponding to the UC14b TP–UC16a TP nannofossil subzones. The inoceramid assemblage indicates the ‘Inoceramus’ azerbaydjanensis – ‘Inoceramus’ vorhelmensis Zone, correlated within the interval of nannofossil subzones UC15d TP–UC15e TP. The composition of the dinoflagellate cyst assemblages and palynofacies pattern suggest normal marine, oxic conditions and low nutrient availability within a distal shelf to open marine depositional environment during the Campanian.

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Section: Appendixmentioning

confidence: 99%

Acta Geologica Polonica

2022

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“…On the basis of these prior studies we follow the classification by Deflandre, keeping in mind that it will be revised when cultivation studies show the true affinities of these taxa. Because they were discovered and described from Tertiary diatomites (Deflandre 1932a(Deflandre , 1932b(Deflandre , 1933(Deflandre , 1938 or late Cretaceous deposits (Rampi 1940(Rampi , 1948, archaeomonads have been considered to be restricted to the late Cretaceous to Miocene periods (i.e. not found from Oligocene to Pliocene by Tynan 1971).…”

Section: Introductionmentioning

confidence: 99%

Modern Archaeomonadaceae from the land-fast ice off Adélie Land, East Antarctica: a preliminary report

Riaux-Gobin

Stumm

2006

Antartic science

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Abstract:The land-fast ice and the platelet ice layer off Adélie Land are inhabited by a dense and diversified diatom community. Along with Bacillariophyceae, Archaeomonadaceae sensu Deflandre are present and relatively abundant. These modern siliceous nanostructures are similar to the nanofossils described by geologists in marine sediments from upper Cretaceous to Pliocene, Pleistocene and recently in Holocene and modern sediments, and are probably related to chrysophyte cysts. The two most abundant taxa were Achaeomonas cf areolata Deflandre and Litheusphaerella cf spectabilis Deflandre. The other taxa were not common. Despite the taxonomic uncertainty of immature forms, the diversity of archaeomonads was high. Three new species of Archaeomonas are described. The morphology of A. cf areolata is highly variable, showing a possible diversification over geologic time. Litheusphaerella cf spectabilis also shows some differences between fossil and modern specimens. Recent studies confirm that archaeomonads are extant in diverse marine water bodies and recent sediments. There is growing evidence that these siliceous structures represent possible reliable proxies of sea ice extent, even if their presence in geologic time is not always linked exclusively to sea ice. Further studies are needed to elucidate the exact origin of these cysts and their real taxonomic affinities.

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