The presumed ginkgophyte<i>Umaltolepis</i>has seed-bearing structures resembling those of Peltaspermales and Umkomasiales

Herrera, Fabiany; Shi, Gongle; Ichinnorov, Niiden; Takahashi, Masamichi; Бугдаева, Е. В.; Herendeen, Patrick S.; Crane, Peter R.

doi:10.1073/pnas.1621409114

Cited by 33 publications

(21 citation statements)

References 35 publications

(47 reference statements)

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“…Besides the above assertion of two integuments in Monetianthus [28], similar assertions of ONE (instead of MORE) seed in so-called "Umkomasia" [30], TWO (instead of ONE) veins in Pseudotorellia [31,32], and "FREE" (instead of FUSED) carpels in Kajanthus [33] of Shi et al [30] are compared, which were supposed of the same thing but quite distinct in vision, especially in term of number of seeds. The asserted "free" carpels in Kajanthus are actually totally fused from the bottom to the apex [33].…”

Section: A Formidable Trend In Palaeobotanymentioning

confidence: 72%

A Biased, Misleading Review on Early Angiosperms

Wang¹

2017

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A recently published review by Herendeen et al. is misleading, self-centered, self-praising, and self-conflicting. They excluded the famous early angiosperm Archaefructus from their list of exemplar angiosperms, which contained only fossil plants they published themselves, leaving the impression that they were only authoritative on the origin and early history of angiosperms. Their 57-year-old "No Angiosperms Until the Cretaceous" conception does not reflect the truth about the origin and early history of angiosperms. Reinforcing such vapidly repeated statement does not help resolving any problem in science but leads to no solution for the origin of angiosperms. The authors tried to establish a criterion identifying a fossil angiosperm but their own exemplar angiosperm Monetianthus overturns their own criterion. Apparently, such a review does not positively contribute much to science.

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Section: A Formidable Trend In Palaeobotanymentioning

confidence: 72%

A Biased, Misleading Review on Early Angiosperms

Wang¹

2017

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“…iwatsukii in the lignite floras and the exquisite preservation also suggest little long distance transport from the place of growth. The Tevshiin Govi and Tugrug floras were dominated by conifers and other gymnosperms, some of them deciduous, including conifers such as Krassilovia (Herrera et al, 2015; Shi et al, 2017), Schizolepidopsis , Picea , and Pityostrobus in Pinaceae (Leslie et al, 2013; Herrera et al, 2016), Elatides , Stutzeliastrobus , and Pentakonos in Cupressaceae (Shi et al, 2014; Herrera et al, 2017b), the putative ginkgophyte plant Umaltolepis (Herrera et al, 2017a), as well as the corystosperm Umkomasia (Shi et al, 2016). The authors hypothesize that H .…”

Section: Discussionmentioning

confidence: 99%

An exquisitely preserved filmy fern (Hymenophyllaceae) from the Early Cretaceous of Mongolia

Herrera

Moran

Shi

et al. 2017

American J of Botany

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Hymenophyllum iwatsukii was likely an epiphyte based on the sedimentary environment in which the fossils are preserved, the associated fossil flora, and the growth habit of extant species of Hymenophyllum. The new fossil species underlines the extent to which morphological characters in Hymenophyllum have been conserved despite significant tectonic, climatic, ecological, and floristic changes since the Early Cretaceous.

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“…Two other strap-shaped, multiveined leaves at Tevshiin Govi, assigned to Pseudotorellia resinosa, and P. palustris [63], have fewer veins (4-14 vs. 14-25 per leaf), thick cuticles, and longitudinally oriented stomata in which the guard cells are sunken and surrounded by 2-5 lateral subsidiary cells, and 1-3 polar cells that resemble normal epidermal cells [63]. Pseudotorellia resinosa is the leaf of the ginkgophyte Umaltolepis mongoliensis [70], while P. palustris is inferred to be the leaf of the corystosperm Umkomasia mongolica [31].…”

Section: Linking Krassilovia Mongolica and Podozamites Harrisiimentioning

confidence: 99%

Reconstructing Krassilovia mongolica supports recognition of a new and unusual group of Mesozoic conifers

Herrera¹,

Shi

Mays

et al. 2020

PLoS ONE

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Previously unrecognized anatomical features of the cone scales of the enigmatic Early Cretaceous conifer Krassilovia mongolica include the presence of transversely oriented paracytic stomata, which is unusual for all other extinct and extant conifers. Identical stomata are present on co-occurring broad, linear, multiveined leaves assigned to Podozamites harrisii, providing evidence that K. mongolica and P. harrisii are the seed cones and leaves of the same extinct plant. Phylogenetic analyses of the relationships of the reconstructed Krassilovia plant place it in an informal clade that we name the Krassilovia Clade, which also includes Swedenborgia cryptomerioides-Podozamites schenkii, and Cycadocarpidium erdmanni-Podozamites schenkii. All three of these plants have linear leaves that are relatively broad compared to most living conifers, and that are also multiveined with transversely oriented paracytic stomata. We propose that these may be general features of the Krassilovia Clade. Paracytic stomata, and other features of this new group, recall features of extant and fossil Gnetales, raising questions about the phylogenetic homogeneity of the conifer clade similar to those raised by phylogenetic analyses of molecular data.

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The presumed ginkgophyteUmaltolepishas seed-bearing structures resembling those of Peltaspermales and Umkomasiales

Cited by 33 publications

References 35 publications

A Biased, Misleading Review on Early Angiosperms

A Biased, Misleading Review on Early Angiosperms

An exquisitely preserved filmy fern (Hymenophyllaceae) from the Early Cretaceous of Mongolia

Reconstructing Krassilovia mongolica supports recognition of a new and unusual group of Mesozoic conifers

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