Vladimariales ordo nov. (Gymnospermae) from the Middle Jurassic deposits of the Mikhailovskii rudnik locality (Kursk Region, European Russia)

Gordenko, N. V.

doi:10.1134/s0031030110100060

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…Among other fossils, U. mongoliensis is remarkably similar to the isolated, well-preserved seed-bearing structures described as Vladimaria octopartita from the Middle Jurassic of European Russia (13). The shoots and leaves of Vladimaria are unknown, but based on the seed-bearing structures there is no doubt that the two genera are closely related.…”

Section: Assignment To Umaltolepis and Comparison With Previously Dessupporting

confidence: 52%

“…A further interesting comparison for the seed-bearing structures of Umaltolepis and Vladimaria is provided by the cupules of Umkomasiales (13,14). In Umkomasiales, as in Umaltolepis, the seeds are also partially to completely enclosed within a "cupule," which is formed by the stalk on which the seed is borne, together with a bilobed or multilobed flap of tissue (14,30).…”

Section: Discussionmentioning

confidence: 99%

“…The shoots and leaves of Vladimaria are unknown, but based on the seed-bearing structures there is no doubt that the two genera are closely related. Vladimaria was interpreted as a "composite seedbearing capsule" in which each locule contained a pendulous winged seed (13). Like U. mongoliensis, Vladimaria is thick, resinous, and has a thick outer cuticle with sunken guard cells that have distinct butterfly-like flanges at their junction with the subsidiary cells (SI Appendix, Table S2).…”

Section: Assignment To Umaltolepis and Comparison With Previously Desmentioning

confidence: 99%

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

Herrera

Shi

Ichinnorov

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Significance Understanding the origins of the five groups of living seed plants requires well-supported hypotheses of their relationships to extinct groups, many of which are poorly understood. New information from the Early Cretaceous of Mongolia on the enigmatic extinct plant Umaltolepis shows that its leaves are similar to those of Ginkgo , but its seed-bearing structures are unique, and more comparable to those of certain extinct Peltaspermales and Umkomasiales. Umaltolepis provides new data for understanding relationships among living and fossil seed plants and supports previous ideas that Ginkgo biloba may be the sole surviving relict of a once very diverse group of Mesozoic seed plants.

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Section: Assignment To Umaltolepis and Comparison With Previously Dessupporting

confidence: 52%

Section: Discussionmentioning

confidence: 99%

Section: Assignment To Umaltolepis and Comparison With Previously Desmentioning

confidence: 99%

See 1 more Smart Citation

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

Herrera

Shi

Ichinnorov

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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“…Originally described as an angiosperm because the seeds are enclosed inside a fleshy fruitlike structure, it was later shown that the pollen grains had direct access to the micropyle of the enclosed seeds, a key difference between pollina tion in angiosperms and other seed plants. Thus, distinguishing angiosperm carpels from structures that enclose the ovules in other seed plants such as Vladimaria 57 and Umkomasia 58 is critical, as is knowledge of what the other plant parts (if known) indicate about possible relationships. In Caytonia, the pollen grains are saccate and have a nonangiospermous wall structure with a thick endex ine 59 .…”

Section: Evidence From Mesofossils and Macrofossilsmentioning

confidence: 99%

Palaeobotanical redux: revisiting the age of the angiosperms

et al. 2017

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M ore than half a century ago, two pivotal reviews 1,2 showed that while the fossil history of angiosperms "is extra ordinarily and increasingly well documented in postEarly Cretaceous sediments…no bona fide angiosperm remains, either megafossil or microfossil, have yet been described from rocks older than Early Cretaceous" 1 . Here, we revisit this conclusion and assess the extent to which the situation has changed, given a substantial increase in the quantity and quality of palaeobotanical data and an increasing number of reports of angiosperms from older rocks.Since the key reviews of the 1960s, great progress has been made in understanding the major patterns in the angiosperm fossil record [3][4][5] . There have also been significant advances in understand ing evolutionary relationships within the angiosperm clade-espe cially in using DNA sequences from living plants to reconstruct phylogenetic patterns 6 . Widely accepted hypotheses indicate that more than 99% of angiosperm species occur in three major clades (eudicots, monocots, (eu)magnoliids), which are embed ded in a paraphyletic assemblage of other early diverging lineages that includes Amborellales, Austrobaileyales, Ceratophyllales, Chloranthales and Nymphaeales [6][7][8] . More controversial are esti mates of the age of the most recent common ancestor of extant angiosperms based on molecular clock techniques, and hypotheses of the phylogenetic position of angiosperms in relation to other seed plant lineages. As molecular clock estimates are most often calibrated using palaeontological data, and because the closest rela tives to angiosperms are almost certainly extinct groups, fossils are integral to progress in both of these areas.Building on important advances made during the 1970s preserved as compressions or impressions from Early Cretaceous strata [11][12][13] . Taken together, these discoveries and their sequence of appearance in the fossil record are broadly consistent with the patterns of relation ships established among extant angiosperms using molecular data, and the associated patterns of character evo lution. All of the reproductive structures recognized so far from Early Cretaceous sediments are either extinct forms, apparently with no close relatives among living angiosperms, or are related to Austrobaileyales, Chloranthales, Nymphaeales, various groups of eumagnoliids, or early branches of eudicots or monocots (Fig. 1, for references see refs 10 and 14). Preservation of fine structural details in some of these Early Cretaceous fossils further confirms their inferred relation ship with extant lineages that are hypothesized to have diverged at an early stage in angiosperm diversification based on molecular phylogenetics 15 . The improved angiosperm fossil record from the Cretaceous has facilitated the calibration of molecular clock age estimates for various angiosperm clades and for the age of angiosperms as a whole [16][17][18][19][20][21] . While current techniques remain susceptible to prob lems resulting from significantly different ...

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“…The plant fossil record continues to yield evidence that the gymnosperms living today are only a small segment of the total diversity of gymnosperm lineages that existed before the rise of flowering plants during the Mesozoic (Taylor 1976;Anderson and Anderson 2003;Naugolnykh 2008;Gordenko 2010;Wang and Pfefferkorn 2010). Among the numerous extinct gymnosperm clades, the Peltaspermales was a particularly successful and diverse group of seed ferns that existed from the Late Carboniferous until the end of the Triassic (Taylor et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Systematics and Paleoecology of a New Peltaspermalean Seed Fern from the Triassic Polar Vegetation of Gondwana

Bomfleur

Taylor

et al. 2011

International Journal of Plant Sciences

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A new Triassic seed fern is described on the basis of a large collection of well-preserved plant compressions from the Upper Triassic of Mt. Falla, Queen Alexandra Range, central Transantarctic Mountains. The foliage is simple entire-margined to pinnatifid to partly pinnate and is assigned to Dejerseya lobata (Jones et de Jersey) Herbst emend. nov. Associated with these leaves occur two new reproductive structures. The ovulate organ Matatiella dejerseyi sp. nov. is a lax, conelike structure with primarily shield-shaped megasporophylls that are dissected into three to four narrow lobes, each bearing a single recurved, naked ovule. The pollen organ Townrovia polaris sp. nov. consists of a slender axis arising from a covered reproductive bud, bearing pinnately arranged, stalked, elongate receptacles each with ;20 unilocular, clavate pollen sacs; the pollen is bisaccate nontaeniate with an irregular longitudinal sulcus and coarse saccus endoreticulations, corresponding to the dispersed pollen Falcisporites australis. Similar pollen grains occur in the micropylar canals of seed cuticles of M. dejerseyi. Co-occurrence data indicate that the three taxa are probably different organs from one plant species. This new seed fern is assigned to the Matatiellaceae, which we place into the Peltaspermales because of structural similarities with vegetative and reproductive organs of other peltaspermalean seed ferns. It appears that several Triassic Gondwanan plant fossil taxa of currently uncertain affinities-such as Pachydermophyllum, Linguifolium, Carpolithus mackayi, and Andersonia-may belong to the Matatiellaceae as well. We suggest that the matatiellacean peltasperms were opportunistic, early successional plants that were particularly successful in colonizing stressed wetland environments in polar latitudes during the Triassic.

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Vladimariales ordo nov. (Gymnospermae) from the Middle Jurassic deposits of the Mikhailovskii rudnik locality (Kursk Region, European Russia)

Cited by 11 publications

References 20 publications

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

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

Palaeobotanical redux: revisiting the age of the angiosperms

Systematics and Paleoecology of a New Peltaspermalean Seed Fern from the Triassic Polar Vegetation of Gondwana

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