Discorhabdus as a key coccolith genus for paleoenvironmental reconstructions (Middle Jurassic, Lusitanian Basin): Biometry and taxonomic status

López-Otálvaro, Gatsby-Emperatriz; Suchéras-Marx, Baptiste; Giraud, Fabienne; Mattioli, Emanuela; Lécuyer, Christophe

doi:10.1016/j.marmicro.2012.06.003

Cited by 18 publications

(9 citation statements)

References 74 publications

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“…It is thus fairly plausible that the absence of environmental stress would naturally promote the background genetic expression of Lotharingius and the increase of its coccolith size. Such a size increase seems to follow the Cope's rule, as already proposed for different marine microorganisms (Schmidt et al, 2006;López-Otálvaro et al, 2012) and the "left wall" model (Stanley, 1973), i.e., evolution often starts near some "limiting boundary", and then diffuses away from an originally small-sized ancestor. Moreover, ecological stability would uphold a faster coccolith growth rate and the occurrence of larger coccoliths as stressed by Schmidt et al (2006), besides enhancing the population interspecific variability.…”

Section: Evolutionary Pushsupporting

confidence: 62%

“…Morphometric studies of marine microfossils have been applied in the past in order to understand evolution or ecological and phenotypic responses of organisms to palaeoenvironmental changes. Although biometric studies of Jurassic coccoliths and nannoliths have already been carried out (Mattioli and Pittet, 2002;Bornemann et al, 2003;Giraud et al, 2006;Suan et al, 2008a;Suchéras-Marx et al, 2010;Tiraboschi and Erba, 2010;Fraguas and Erba, 2010;Fraguas and Young, 2011;López-Otálvaro et al, 2012), none of them addressed the morphological evolution of the Lotharingius genus, the most abundant coccolithophore taxon across Lower-Middle Jurassic sediments. Though a significant size increase in Lotharingius coccoliths across this time period has already been qualitatively acknowledged in the Lusitanian Basin (Portugal; Ferreira et al, 2015), no biometric evaluation has been made so far.…”

Section: Introductionmentioning

confidence: 99%

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Palaeoenvironmental vs. evolutionary control on size variation of coccoliths across the Lower-Middle Jurassic

Ferreira

Mattioli

Schootbrugge

2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Evolutionary Pushsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Palaeoenvironmental vs. evolutionary control on size variation of coccoliths across the Lower-Middle Jurassic

Ferreira

Mattioli

Schootbrugge

2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…However, the taxonomy adopted by some of these authors is someway different to the one followed herein. Actually, biometric studies of Jurassic coccoliths such as those performed on the genera Similiscutum/Biscutum (de Kaenel and Bergen, 1993;Mattioli et al, 2004), Lotharingius (Mattioli, 1996;Fraguas and Young, 2011;Ferreira et al, 2017), Crepidolithus (Suchéras-Marx et al, 2010;Fraguas and Erba, 2010), Discorhabdus (López-Otálvaro et al, 2012) and Watznaueria (Giraud et al, 2006;Tiraboschi and Erba, 2010), resulted in a quantitative and partially revised taxonomy. Such a revision deeply impacts biostratigraphic studies and therefore the chronostratigraphic range of the redefined taxa should be precisely determined.…”

Section: Previous Workmentioning

confidence: 99%

“…The reference section for this subzone is Rabaçal. Discorhabdus striatus can be differentiated from D. ignotus by its larger size (>5 µm) and brighter birefringence colors (light grey) under polarizing light (López-Otálvaro et al, 2012).…”

Section: Njt3 -Crepidolithus Pliensbachensis Zonementioning

confidence: 99%

Western Tethys Early and Middle Jurassic calcareous nannofossil biostratigraphy

Ferreira

Mattioli

Suchéras-Marx

et al. 2019

Earth-Science Reviews

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An exhaustive biostratigraphic study based on the calcareous nannofossil content from Lower and Middle Jurassic Lusitanian Basin sections in Portugal is here presented. Located at the strategic intersection of important Jurassic water masses during a period of drastic environmental changes, the Lusitanian Basin conveyed mixed phytoplanktonic communities in its surface waters. Approximately 800 m of exceptionally continuous Lower and Middle Jurassic series bearing detailed ammonite biostratigraphy and two Global Stratotype Section and Point are studied. Vertical and lateral ubiquity of calcareous nannofossils in marine sediments and rapid evolutionary rate and radiation make this fossil group a remarkable biostratigraphic tool. Nearly 100 bioevents are acknowledged in ~24 Myr time span this work refers to, bridging 11 nannofossil zones and 29 subzones. A thorough revision of the existing literature referring to Early and Middle Jurassic calcareous nannofossil biostratigraphy is presented, and causes and implications for zonal marker discrepancies discussed under a palaeoceanographic and Jurassic nannofossil evolution angle. In order to create a solid biostratigraphic frame and to compare it with C and O stable isotopic trends, brachiopod calcite shells were analysed for geochemistry. This work yields for the first time a very detailed and inclusive biostratigraphic scheme for the Early and Middle Jurassic epochs.

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“…The Bajocian GSSP has been defined by the first occurrence of the ammonite assemblage including Hyperlioceras mundum (Buckman) and related species – H. furcatum (Buckman), Braunsina aspera Buckman, B. elegantula (Buckman) – by the onset of different calcareous nannofossil species of Watznaueria , and by an inversion from reversed to normal polarity (Henriques et al ., ). More recently, other fossil groups have been studied in detail across the GSSP, namely brachiopods (Andrade, , ), calcareous nannoplankton (Neto, ; Neto et al ., ; López‐Otálvaro et al ., ) and benthic foraminifers (Canales and Henriques, , ).…”

Section: Introductionmentioning

confidence: 99%

High resolution ammonite–benthic foraminiferal biostratigraphy across the Aalenian–Bajocian boundary in the Lusitanian Basin (Portugal)

2014

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This work describes the ammonite and benthic foraminiferal assemblages recorded across the Aalenian-Bajocian boundary of the Serra da Boa Viagem II section, located about 6 km to the east of the Bajocian GSSP (Murtinheira, Portugal), and calibrated to the standard ammonite zonation previously established for the Lusitanian Basin. A total of 220 ammonite specimens referred to 30 fossiliferous levels were collected and identified throughout the section, enabling the recognition of the Concavum Zone (Concavum and Limitatum subzones) of the upper Aalenian, and the Discites Zone of the lower Bajocian. A total of 2356 foraminifers were obtained from the 16 samples collected along the section, corresponding to 4 suborders, 8 families, 16 genera and 44 species.The occurrence of Lenticulina quenstedti (Gümbel) has enabled the recognition of the Lenticulina quenstedti Zone, ranging from the Bradfordensis Zone (middle Aalenian) to the lower Discites Zone (lower Bajocian). The first record of Ramulina spandeli Paalzow, whose occurrence, up to now, was limited in the Lusitanian Basin to the Murtinheira section (the Bajocian GSSP), highlights the usefulness of the Ramulina spandeli Zone, with its lower boundary referred to the lower Discites Zone (lower Bajocian). Other bioevents displaying local, basinal or regional biostratigraphic interest have also been identified.The benthic foraminiferal record here presented, accurately calibrated with the ammonite record, aims at contributing to support the recognition of the Lenticulina quenstedti Zone and the Ramulina spandeli Zone as formal biostratigraphic units integrating the biostratigraphic scale based on benthic foraminifers for the Aalenian-Bajocian boundary in the Lusitanian Basin (Portugal). Figure 3. Lithological succession of the Serra da Boa Viagem II section, biostratigraphic units based on ammonites and occurrence of the identified ammonite taxa along the section.Figure 5. Lithological succession at the Serra da Boa Viagem II section and biostratigraphic units based on ammonites and benthic foraminifers. The occurrence and relative abundance of the identified foraminiferal taxa recorded along the studied stratigraphic interval are represented by dots with different diameter (R. s.: Ramulina spandeli Zone).

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Discorhabdus as a key coccolith genus for paleoenvironmental reconstructions (Middle Jurassic, Lusitanian Basin): Biometry and taxonomic status

Cited by 18 publications

References 74 publications

Palaeoenvironmental vs. evolutionary control on size variation of coccoliths across the Lower-Middle Jurassic

Palaeoenvironmental vs. evolutionary control on size variation of coccoliths across the Lower-Middle Jurassic

Western Tethys Early and Middle Jurassic calcareous nannofossil biostratigraphy

High resolution ammonite–benthic foraminiferal biostratigraphy across the Aalenian–Bajocian boundary in the Lusitanian Basin (Portugal)

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