Inferred pseudo-cryptic speciation in the coccolithophore species Braarudosphaera bigelowii (Gran and Braarud) during the Early Paleocene (Danian)

Criscione, Julia; Bord, David; Godfrey, Linda; Aubry, Marie Pierre

doi:10.1016/j.marmicro.2017.09.002

Cited by 3 publications

(13 citation statements)

References 53 publications

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“…The morphotypes that we recognized using all of our measured size and shape variables were primarily separated by pentalith size, supporting earlier findings that this is the most important attribute in distinguishing between distinct Braarudosphaera morphotypes (e.g., Hagino et al 2009;Criscione et al 2017). However, shape was important in identifying potential "diagenetic morphotypes" and can be used to assess whether variation in the dominant Braarudosphaera forms is more likely a primary signal or related to changes in diagenesis.…”

Section: Identifying the Presence Of Distinct Braarudosphaera Morphotypes Following The K/pg Boundarysupporting

confidence: 87%

“…Morphotypes Based on Pentalith Side-length Measurements (Size).-To estimate how many distinct components (i.e., Braarudosphaera morphotypes) were likely to be present in our dataset, we used Gaussian mixture modeling following Criscione et al (2017). To directly compare our data to those of Hagino et al (2009) and Criscione et al (2017), we ran our mixture models using only the pentalith side length, therefore only considering size and not shape.…”

Section: Identifying the Presence Of Distinct Braarudosphaera Morphotypes Following The K/pg Boundarymentioning

confidence: 99%

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Size and shape variation in the calcareous nannoplankton genusBraarudosphaerafollowing the Cretaceous/Paleogene (K/Pg) mass extinction: clues as to its evolutionary success

2021

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Calcareous nannoplankton have been one of the dominant primary producers in the surface oceans since the late Triassic. The bolide impact at the Cretaceous/Paleogene (K/Pg) boundary ~66.0 Ma, led to the elimination of >90% of nannoplankton species: the largest extinction event in their evolutionary history. One of the few nannoplankton genera to survive the K/Pg mass extinction and even thrive in its aftermath was Braarudosphaera, which precipitates pentagonal calcite plates (pentaliths). The only Braarudosphaera species to span the K/Pg boundary (B. bigelowii) is extant and has formed geographically and temporally restricted “blooms” throughout geologic time. Four morphologically and genetically distinct cryptic species of B. bigelowii have been identified in the modern ocean. However, it is uncertain whether these cryptic species have disparate ecophysiological tolerances that have allowed them to adapt to varying environmental conditions. For the first time, we assess changes in the size and shape of Braarudosphaera pentaliths following the K/Pg mass extinction at three geographically and environmentally disparate sites that have early Paleocene Braarudosphaera blooms. Our results show that different Braarudosphaera morphotypes were dominant in the Gulf of Mexico compared with the Tethys Ocean, likely due to regional environmental differences. In addition, we provide evidence that the dominant Braarudosphaera morphotypes shifted in response to changes in upper water column stratification. This ability to rapidly adapt to unstable environments likely helped Braarudosphaera thrive in the aftermath of the K/Pg extinction and explains why this lineage has enjoyed such a long evolutionary history.

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Section: Identifying the Presence Of Distinct Braarudosphaera Morphotypes Following The K/pg Boundarysupporting

confidence: 87%

Section: Identifying the Presence Of Distinct Braarudosphaera Morphotypes Following The K/pg Boundarymentioning

confidence: 99%

Size and shape variation in the calcareous nannoplankton genusBraarudosphaerafollowing the Cretaceous/Paleogene (K/Pg) mass extinction: clues as to its evolutionary success

2021

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“…In order to avoid misinterpretation, we suggest using "radiation of Diantholitha" and "radiation of Lithoptychius" to describe the appearance and rapid diversification of Diantholitha and Lithoptychius, respectively. This avoids the ambiguity between the first radiation-diversification of Fasciculithus (Steurbaut and Sztrákos, 2008;Bernaola et al, 2009;Dinarès-Turell et al, 2010) and the original definition of the first radiation of Fasciculithus defined by Romein (1979).…”

Section: The Radiation Of Fasciculiths (Characterization and Comparison With First And Second Radiation)mentioning

confidence: 96%

“…At least two distinct radiation events (first and second radiation of fasciculiths) were recognized across the Danian-Selandian. Fasciculith radiation has been documented in different areas (e.g., Steurbaut and Sztrákos, 2008;Bernaola et al, 2009;Dinarès-Turell et al, 2010;Aubry et al, 2012;Monechi et al, 2013;Miniati et al, 2014) and therefore represent an important biostratigraphic tools for this time interval. Romein (1979) introduced the term "first radiation of Fasciculithus" to distinguish the gradual evolution of fasciculiths from the ancestor form G. magnus in the E. macellus-F. tympaniformis zones.…”

Section: The Radiation Of Fasciculiths (Characterization and Comparison With First And Second Radiation)mentioning

confidence: 99%

“…Unfortunately, the same term (second radiation) has been used to indicate two different and temporally distinct events and time intervals. The term "second radiation of fasciculiths" was used by Bernaola et al (2009) to approximate the Danian-Selandian boundary at the Zumaia section, and it has also been documented at the Qreiya section (Monechi et al, 2013), Loubieng section (Steurbaut and Sztrákos, 2008) and Bjala section (Dinarès-Turell et al, 2010). The term "second radiation of Fasciculithus" was also used to indicate the differentiation of Fasciculithus occurring in the upper Paleocene (NP9) Discoaster multiradiatus zone (Romein, 1979;Perch-Nielsen, 1985;Aubry, 1989;Agnini et al, 2007;Aubry et al, 2012).…”

Section: Second Radiation Of Fasciculithsmentioning

confidence: 99%

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Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition

Miniati

Cappelli

Monechi

2021

J. Micropalaeontol.

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Abstract. We present a taxonomic revision of the family Fasciculithaceae focused on forms that characterize the early evolution of this family group, which are currently included within the genera Gomphiolithus, Diantholitha, Lithoptychius and Fasciculithus. The investigation approach is based on a combined light microscope (LM) and scanning electron microscope (SEM) analysis of specimens from well-preserved ODP–DSDP site material (ODP Site 1209; Site 1262; ODP Site 1267; DSDP Site 356; DSDP Site 119) and outcrops (Bottaccione and Contessa, Italy; Qreiya, Egypt) across the Danian–Selandian transition. The direct LM–SEM comparison of the same individual specimen provides clarification of several taxa that were previously described only with the LM. One new genus (Tectulithus), five new combinations (Tectulithus janii, Tectulithus merloti, Tectulithus pileatus, Tectulithus stegastos and Tectulithus stonehengei) and six new species are defined (Diantholitha pilula, Diantholitha toquea, Lithoptychius galeottii, Lithoptychius maioranoae, Tectulithus pagodiformis and Fasciculithus realeae). The main characteristics useful to identify fasciculiths with the LM are provided, together with a 3D–2D drawing showing the main structural features. The accurate taxonomic characterization grants the development of an evolutionary lineage that documents a great fasciculith diversification during the late Danian and early Selandian. Four different well-constrained events have been documented: the lowest occurrence (LO) of Gomphiolithus, the paracme of Fasciculithaceae at the top of Chron C27r (PTC27r), the radiation of Diantholitha (LO Diantholitha), the paracme of Fasciculithaceae at the base of Chron C26r (PBC26r), the radiation of Lithoptychius (LO Lithoptychius) and the radiation of Tectulithus (lowest common occurrence of Tectulithus) that shows the biostratigraphic relevance of this group across the Danian–Selandian transition.

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Peering into the Biology of Extinct Coccolithophores: The Order Discoasterales

Aubry¹

2019

Geologic Problem Solving With Microfossils IV

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Inferred pseudo-cryptic speciation in the coccolithophore species Braarudosphaera bigelowii (Gran and Braarud) during the Early Paleocene (Danian)

Cited by 3 publications

References 53 publications

Size and shape variation in the calcareous nannoplankton genusBraarudosphaerafollowing the Cretaceous/Paleogene (K/Pg) mass extinction: clues as to its evolutionary success

Size and shape variation in the calcareous nannoplankton genusBraarudosphaerafollowing the Cretaceous/Paleogene (K/Pg) mass extinction: clues as to its evolutionary success

Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition

Peering into the Biology of Extinct Coccolithophores: The Order Discoasterales

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