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Scanning electron microscopy investigation of monads and tetrads of basal core eudicots from the Upper Cretaceous Vilui Basin, Siberia: Evidence for reticulate evolution

Hofmann, Christa-Charlotte; Spicer, Robert A.; Ahlberg, Anders LU and Herman, Alexei B. (2011) In Review of Palaeobotany and Palynology 167(3-4). p.196-211
Abstract
Non-marine Late Cretaceous sediments from the Vilui Basin, Siberia, yield a diverse palynoflora of over 180 taxa, a third of which had a circum-polar distribution. The Vilui palynoflora belongs generally to the northerly Aquilapollenites Province admixed with minute Normapolles types, and comprises about 36-70% angiosperm pollen forms, indicating a late Campanian/early Maastrichtian age. Using a combination of light and scanning electron microscopy we examined well-known stratigraphic taxa such as Aquilapollenites mtchedlishvilii Srivastava, Aquilapollenites decorus Srivastava Azonia recta Bolkhovitina and Tricerapollis minutus Chlonova. Further we present pollen belonging to early eudicots such as Saxifragales (Cercidiphyllaceae,... (More)
Non-marine Late Cretaceous sediments from the Vilui Basin, Siberia, yield a diverse palynoflora of over 180 taxa, a third of which had a circum-polar distribution. The Vilui palynoflora belongs generally to the northerly Aquilapollenites Province admixed with minute Normapolles types, and comprises about 36-70% angiosperm pollen forms, indicating a late Campanian/early Maastrichtian age. Using a combination of light and scanning electron microscopy we examined well-known stratigraphic taxa such as Aquilapollenites mtchedlishvilii Srivastava, Aquilapollenites decorus Srivastava Azonia recta Bolkhovitina and Tricerapollis minutus Chlonova. Further we present pollen belonging to early eudicots such as Saxifragales (Cercidiphyllaceae, Altingiaceae and Hamamelidaceae), basal eudicots (? Buxaceae) and basal core eudicots (?Gunnerales) that are preserved as colpate or porate forms, some of which are preserved as obligate tetrads, such as the morphogenera Virgo Ward, Artiopollis (Agasie) Singh, and Senectoteradites Dettmann while others are preserved as single grains or in pollen aggregations, such as Periporopollenites (Potonie) Pflug &Thomson, Retitricolpites (van der Hammen) Pierce and unnamed tricolpate types. The following new species are introduced: Virgo nicholsii, Artiopollis tyungensis, Artiopollis bellus, Periporopollenites sakhaensis, and Senectotetradites viluiensis. Our approach revealed features suggesting that individual grain types exhibit affiliations to more than one extant family. This mirrors trans-familial characters also observed in Late Cretaceous leaf fossils and is typical of reticulate evolution. (C) 2011 Published by Elsevier B.V. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Upper Cretaceous, Vilui Basin, basal eudicots, SEM, reticulate evolution
in
Review of Palaeobotany and Palynology
volume
167
issue
3-4
pages
196 - 211
publisher
Elsevier
external identifiers
  • wos:000297880100003
  • scopus:80053176103
ISSN
0034-6667
DOI
10.1016/j.revpalbo.2011.08.007
language
English
LU publication?
yes
id
74d344fc-6bc8-4e61-9c16-e2cadc578d05 (old id 2279403)
date added to LUP
2012-01-11 15:32:43
date last changed
2017-07-02 03:49:46
@article{74d344fc-6bc8-4e61-9c16-e2cadc578d05,
  abstract     = {Non-marine Late Cretaceous sediments from the Vilui Basin, Siberia, yield a diverse palynoflora of over 180 taxa, a third of which had a circum-polar distribution. The Vilui palynoflora belongs generally to the northerly Aquilapollenites Province admixed with minute Normapolles types, and comprises about 36-70% angiosperm pollen forms, indicating a late Campanian/early Maastrichtian age. Using a combination of light and scanning electron microscopy we examined well-known stratigraphic taxa such as Aquilapollenites mtchedlishvilii Srivastava, Aquilapollenites decorus Srivastava Azonia recta Bolkhovitina and Tricerapollis minutus Chlonova. Further we present pollen belonging to early eudicots such as Saxifragales (Cercidiphyllaceae, Altingiaceae and Hamamelidaceae), basal eudicots (? Buxaceae) and basal core eudicots (?Gunnerales) that are preserved as colpate or porate forms, some of which are preserved as obligate tetrads, such as the morphogenera Virgo Ward, Artiopollis (Agasie) Singh, and Senectoteradites Dettmann while others are preserved as single grains or in pollen aggregations, such as Periporopollenites (Potonie) Pflug &Thomson, Retitricolpites (van der Hammen) Pierce and unnamed tricolpate types. The following new species are introduced: Virgo nicholsii, Artiopollis tyungensis, Artiopollis bellus, Periporopollenites sakhaensis, and Senectotetradites viluiensis. Our approach revealed features suggesting that individual grain types exhibit affiliations to more than one extant family. This mirrors trans-familial characters also observed in Late Cretaceous leaf fossils and is typical of reticulate evolution. (C) 2011 Published by Elsevier B.V.},
  author       = {Hofmann, Christa-Charlotte and Spicer, Robert A. and Ahlberg, Anders and Herman, Alexei B.},
  issn         = {0034-6667},
  keyword      = {Upper Cretaceous,Vilui Basin,basal eudicots,SEM,reticulate evolution},
  language     = {eng},
  number       = {3-4},
  pages        = {196--211},
  publisher    = {Elsevier},
  series       = {Review of Palaeobotany and Palynology},
  title        = {Scanning electron microscopy investigation of monads and tetrads of basal core eudicots from the Upper Cretaceous Vilui Basin, Siberia: Evidence for reticulate evolution},
  url          = {http://dx.doi.org/10.1016/j.revpalbo.2011.08.007},
  volume       = {167},
  year         = {2011},
}