Ginkgoales: Some problems of systematics and phylogeny

Gordenko, N. V.; Broushkin, A. V.

doi:10.1134/s0031030115050068

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…Thomas (1933) erected the Corystospermaceae; however, that name (or its use as Brought to you by | MIT Libraries Authenticated Download Date | 5/13/18 8:00 AM a basis for a higher-ranking name) is not adopted herein, being nomenclaturally superfluous (Petriella 1981, Pattemore et al 2015a, ICN Articles 16.1, 18.1). Meyen's (1984) placement of the Umkomasiaceae in Ginkgoopsida was supported by Anderson & Anderson (2003) and Gordenko & Broushkin (2015), and is followed in the present study.…”

Section: Order: Peltaspermalessupporting

confidence: 50%

Megaflora of the Australian Triassic–Jurassic: a taxonomic revision

Pattemore

2016

Acta Palaeobotanica

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ABSTRACT. Umkomasiaceans are the most commonly recorded components of Gondwanan Triassic floras but they are not represented subsequently in that region. Their diversity appears to have substantially declined prior to the Rhaetian. Lower and Middle Jurassic floras in Australia and elsewhere in Gondwana are strikingly different from those of the Triassic, comprising ferns, lycopods, conifers, cycads, and bennettitaleans. The fern Cladophlebis Brongniart 1849 emend. Seward 1894 dominated coal-forming paludal environments during the Middle Jurassic in Queensland and it is one of the most commonly preserved plants in the Eastern Gondwanan Jurassic. Ginkgoaleans were present in Eastern Gondwana until near the end-Triassic but were absent below ca 60°S palaeolatitude during the Early and Middle Jurassic.The type specimen of Dicroidium superbum (Shirley 1898) Townrow 1957 emend. nov. has been inaccurately represented in the published record. Consequently, many specimens belonging to the species have been incorrectly assigned to other umkomasiacean species. Misidentifications and considerably enlarged circumscriptions of some species have resulted in an erroneous and simplistic morpho-continuum concept supposedly linking umkomasiacean fronds. Several commonly occurring umkomasiacean species are re-assessed with particular attention to their type specimens, two of which are accurately figured here for the first time. This re-assessment, together with evidence from allied fructifications and wood, supports the view that umkomasiacean fronds belong to several genera. Most umkomasiacean lineages probably terminated prior to the Rhaetian; however, Zuberia Frenguelli 1943 emend. Artabe 1990 persisted to near the close of the Triassic.

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Section: Order: Peltaspermalessupporting

confidence: 50%

Megaflora of the Australian Triassic–Jurassic: a taxonomic revision

Pattemore

2016

Acta Palaeobotanica

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“…Ginkgoopsida was supported by Anderson & Anderson (2003) and Gordenko & Broushkin (2015) and is followed in the present study.…”

Section: Triassic Pteridospermssupporting

confidence: 70%

“…However, phylogenetic relationships both within the family and more broadly are poorly understood (chapter 2). Previous studies include Meyen (1984), Crane (1985), Retallack & Dilcher (1988) and Gordenko & Broushkin (2015). The umkomasiacean lineage probably terminated globally near the end-Triassic (chapters 2, 3); specimens reported by Kirchner & Müller (1992) from the Liassic of Germany are doubtful representatives of the family (below).…”

Section: Introductionmentioning

confidence: 97%

“…Triassic pteridosperms form a very distinctive group morphologically; their fructifications resemble those of certain Permian peltasperms and much more broadly those of the ginkgophytes (Meyen 1984, Gordenko & Broushkin 2015. The Late Triassic was the last interval in which pteridosperms of Gondwana were preserved abundantly and diversely.…”

Section: Introductionmentioning

confidence: 99%

“…Results of this study suggest that the interpretation and taxonomy of several specimens attributed to this family from Gondwana and beyond require reconsideration. Umkomasiaceans have been allied with the class Ginkgoopsida (Meyen 1984, Gordenko & Broushkin 2015. Ginkgoalean long and short shoots are well understood botanically and terminology applied herein follows Leigh et al (2011) and Little et al (2013).…”

Section: Introductionmentioning

confidence: 99%

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