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Biscutum constans

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Journal Article
Journal: PALAIOS
Published: 01 October 2015
PALAIOS (2015) 30 (10): 728–742.
... barnesiae , Zeugrhabdotus spp., Biscutum constans , Prediscosphaera cretacea , and Tranolithus orionatus . In combination with previously published data from pelagic settings of the same area, these new findings allow the reconstruction of a nearshore-offshore transect. In proximal sections the abundances...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP382.8
EISBN: 9781862396463
.... The abundance of the nannofossils, Biscutum constans , Discorhabdus rotatorius , Zeugrhabdotus erectus and Diazomatolithus lehmanii suggest higher fertility and eutrophic conditions. Low oxygenation conditions leading to organic matter preservation are suggested by the presence of conical and trochospiral...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP382.7
EISBN: 9781862396463
...-fertility taxa, such as Biscutum constans and Zeugrhabdotus erectus . This shift in nannofloral assemblages starts in the last stages of OAE2; that is, towards the top of the second build-up phase and also covers the main part of the plateau phase of δ 13 C. Since the discovery of carbon-rich black...
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Journal Article
Published: 01 October 2005
Micropaleontology (2005) 51 (4): 333–343.
... of nannofossil taxa which have proxy potential but which require focused study to determine the extent of their utility. Here, we point to the problems associated with some of the most commonly used Mesozoic nannofossil proxy taxa ( Watznaueria spp., Biscutum constans , Zeugrhabdotus erectus , Nannoconus spp...
Journal Article
Published: 01 July 2001
Journal of Micropalaeontology (2001) 20 (1): 45–80.
..., in particular, been comprehensively amended. Five new species, Crucibiscutum bosunensis sp. nov., Crucibiscutum ryazanicum sp. nov., Lithraphidites houghtonii sp. nov., Seribiscutum dentatum sp. nov., Staurolithites palmula sp. nov. and one new sub-species, Biscutum constans cavum ssp. nov. are described...
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Journal Article
Journal: PALAIOS
Published: 01 May 2011
PALAIOS (2011) 26 (5): 298–313.
...). Biscutum spp. consists of the two abundant species B. constans ( Fig. 3R ) and B. ellipticum . Only isolated specimens of B. hattneri , B. cf. magnum , and B. cf. notaculum have been observed. Sollasites horticus (few to common; Fig. 4B ), a Biscutum -like species with a large central...
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Series: Special Publications
Publisher: Society for Sedimentary Geology
Published: 01 January 2019
DOI: 10.2110/sepmsp.111.12
EISBN: 9781565763616
... changes in surface water productivity during these excursions, where Biscutum spp. abundances increased at the onset of the excursions, while species evenness and Shannon’s diversity index decreased. Given these findings, it can be inferred that an increase in surface water productivity led to rapid...
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Abundance patterns of selected calcareous nannofossil taxa through the Ceno...
Published: 01 October 2005
: Biscutum constans (B.c.), Prediscosphaera spp. (P. spp.), Staurolithites spp. (S. spp.), Zeugrhabdotus elegans (Z. el.), Zeugrhabdotus erectus (Z. er.), and Zeugrhabdotus spp. (Z. spp.).
Image
Abundance patterns of selected calcareous nannofossil taxa through the Ceno...
Published: 01 October 2005
indicators: Biscutum constans (B.c.), Prediscosphaera spp. (P. spp.), Staurolithites spp. (St. spp.), Zeugrhabdotus elegans (Z. el .), Zeugrhabdotus erectus (Z. er.), and Zeugrhabdotus spp. (Z. spp.).
Image
Scanning electron micrographs to document the preservation of calcareous na...
Published: 01 July 2005
Fig. 6.  Scanning electron micrographs to document the preservation of calcareous nannofossils and planktic Foraminifera. ( a , b ) Calcareous nannofossils; scale bar represents 2 μm. ( a ) Well-preserved specimen of Biscutum constans (distal view) enclosed with a clayey matrix; calcitic
Image
Vertical distribution of high-fertility calcareous nannofossil indices ( Zy...
Published: 01 May 2001
Figure 8. Vertical distribution of high-fertility calcareous nannofossil indices ( Zygodiscus spp., Biscutum constans, Discorhabdus rotatorius ) in the Coppitella section plotted against stratigraphic column with calcareous nannofossil and planktonic foraminiferal biostratigraphy
Image
Correlation matrix of important calcareous nannofossil taxa. The matrix is ...
in > PALAIOS
Published: 01 October 2015
are significant at a level of 99.9%, regular numbers at 95% and shaded numbers are non-significant. Abbreviations: abs. abundance  =  absolute abundance; B. constans  =  Biscutum constans ; D. ignotus  =  Discorhabdus ignotus ; E. gorkae  =  Eiffellithus gorkae; E. turriseiffelli  =  Eiffellithus
Image
Early ontogenetic development and coccolith manipulation in trochamminids. ...
Published: 01 July 2008
the edges of the coccoliths indicates that this sphere is a proloculus and not a coccosphere (see text for explanation). 8 Magnification of proloculus in 1 . The proloculus is constructed from two species of coccoliths, Watznaueria barnesae and Biscutum constans . This excludes it from being
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1–5  Triserial tests showing resemblance to  Eggerella . The interlocking o...
Published: 01 July 2008
Manivitella pemmatoidea ). 5 Small specimens with a large number of the coccoliths Biscutum constans built into the youngest chamber. 6–13 Triserial tests tentatively referred to Verneuilinoides . Initial chambers mainly agglutinated with coccoliths of Watznaueria barnesae , except for the proloculus
Image
The most common coccoliths and nannoliths in sample S291 arranged according...
Published: 01 July 2008
Cretarhabdus conicus : 13 distal view; 14 proximal view. 15 Retecapsa angustiforata , distal view. 16 Axopodorhabdus dietzmannii , distal view. 17 Biscutum constans . 18–21 Coccospheres of Watznaueria barnesae . The morphological variant of W. barnesae shown in 20 is rare and represented only
Image
All figures taken with cross-polarized light. Scale bar equal to 10 µm on a...
Published: 01 July 2003
-24X-1, 110 cm. fig. 4. Arkhangelskiella confusa, ODP 122-761B-24X-2, 110 cm. fig. 5. Arkhangelskiella cymbiformis, ODP 122-762C-43X-1, 95 cm. fig. 6. Aspidolithus parcus constrictus, ODP 122-761B-25X-1 120 cm. fig. 7. Biscutum constans, Swan ST3, 2240m. fig. 8. Biscutum ellipticum, ODP
Journal Article
Published: 01 October 2005
Micropaleontology (2005) 51 (4): 319–332.
...: Biscutum constans (B.c.), Prediscosphaera spp. (P. spp.), Staurolithites spp. (S. spp.), Zeugrhabdotus elegans (Z. el.), Zeugrhabdotus erectus (Z. er.), and Zeugrhabdotus spp. (Z. spp.). ...
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Fig. 1.  Acaenolithus galloisii , crossed-nicols, SMH-18-05; 3215 ft (core)...
Published: 01 July 2001
-nicols, SMH-18-12, 11321.2 ft (core), UK 21/2-6 (LK14B). Fig. 4 . Biscutum constans cavum , (holotype) crossed-nicols, SMH-18-25, 3215 ft (core), UK 13/22a-2 (LK15). Fig. 5 . Calcicalithina oblongata , crossed-nicols, SMH-20-22, 13514 ft (core), UK 15/25a-2 (LK25). Fig. 6 . Conusphaera mexicana
Journal Article
Published: 01 July 2008
Journal of Foraminiferal Research (2008) 38 (3): 193–214.
... the edges of the coccoliths indicates that this sphere is a proloculus and not a coccosphere (see text for explanation). 8 Magnification of proloculus in 1 . The proloculus is constructed from two species of coccoliths, Watznaueria barnesae and Biscutum constans . This excludes it from being...
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Series: The Micropalaeontological Society, Special Publications
Published: 01 January 2017
DOI: 10.1144/TMS7.15
EISBN: 9781786203069
... diverse and abundant assemblage is recorded from the samples yielding a Cenomanian age. The association of Gartnerago theta, G. nanum and Corollithion kennedyi with abundant Watznaueria barnesiae, common Biscutum constans and common Tranolithus orionatus limits the age to not older than Subzone...
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