Elkinsia gen. nov., a Late Devonian Gymnosperm with Cupulate Ovules

  title={Elkinsia gen. nov., a Late Devonian Gymnosperm with Cupulate Ovules},
  author={Gar W Rothwell and Stephen E. Scheckler and William Honyman Gillespie},
  journal={Botanical Gazette},
  pages={170 - 189}
An extensive collection of fossilized ovules, ovulate cupules, and cupuliferous branching systems from late Devonian deposits of eastern West Virginia is described and named Elkinsia polymorpha gen. et sp. nov. Elkinsia cupules are borne at the tips of cruciately forking axes that show a moderate level of overtopping. Cupules are 1.0-1.8 cm long and 0.6-1.2 cm in maximum diameter. The cupule is constructed of slender axes that fork twice to produce four quarters; each quarter terminates in one… 
Latisemenia longshania, gen. et sp. nov., a new Late Devonian seed plant from China
Latisemenia is the earliest known plant with ovules borne on the side of the fertile axis and may foreshadow the diverse ovule arrangements found among younger seed plant lineages that emerge in the Carboniferous.
Characterizing the Most Primitive Seed Ferns. I. A Reconstruction of Elkinsia polymorpha
Elkinsia polymorpha is the first seed f Fern to be reconstructed from Devonian sediments and the first preovulate seed fern to be characterized as a plant, and represents an important evolutionary unit for ongoing phylogenetic studies of the origin of seed plants.
Thorezia vezerensisgen. et sp. nov., a new seed plant with multiovulate cupules from the Late Devonian of Belgium
It is suggested here that the arid climatic conditions prevailing in eastern Laurussia favoured the development of diverse spermatophyte communities and contributed to reduced diversity and abundance of contemporaneous free-sporing plant diversity.
Were All Devonian Seeds Cupulate? A Reinvestigation of Pseudosporogonites hallei, Xenotheca bertrandii, and Aglosperma spp.
The uniovulate cupule in Pseudosporogonites is distinct from multiovulate telomic cupules of other Devonian seeds and expands the phenotypic diversity seen during the earliest phase of seed plant radiation, which was geologically instantaneous.
Cosmosperma polyloba gen. et sp. nov., a seed plant from the Upper Devonian of South China
Cosmosperma Wang et al. represents the first Devonian ovules recovered from China or eastern Asia and further illustrates the diversity of early spermatophytes.
Distinguishing angiophytes from the earliest angiosperms: A Lower Cretaceous (Valanginian-Hauterivian) fruit-like reproductive structure.
They show that nearly total ovule enclosure, a level of organization approaching angiospermy, was achieved by advanced seed ferns during the Mesozoic, and include tetrahedral seeds within cupule- or carpel-like structures.


Studies on the cupulate seed genus Hydrasperma Long from Berwickshire and East Lothian in Scotland and County Kerry in Ireland
Comparison of H. tenuis with other cupulate Lower Carboniferous seeds indicates that two major branching patterns of the cupule occur in early seed plants, and the Aneurophytales appears to have the branching patterns consistent with its position as the ancestral group.
A probable pteridosperm from the uppermost Devonian near Ballyheigue, Co. Kerry, Ireland
The divisions of the sympodial protoxylem strand forming the rachial trace is compared among the Aneurophytales, Buteoxylonaceae, Calamopityaceae and Lyginopteridaceae and is shown to be similar.
Galtiera bostonensis, gen. et sp. nov., a protostelic calamopityacean from the New Albany shale of Kentucky
Two parts of a single, anatomically preserved stem fragment form the basis of a new Lower Mississippian taxon that is characterized here in detail and hypothesize that the protoxylem strands may comprise five sympodia and that although protostelic in gross morphology, the primary vascular system of Galtiera might actually be more similar to typical eusteles of the Calamopityaceae than protostelles of any other major group.
  • K. Niklas
  • Geology
    Evolution; international journal of organic evolution
  • 1983
It is recognized that the early seed plants were at least initially anemophilous and that pollination may have been determined in large part by the morphology of the ovule.
The earliest seeds
These seeds predate Archaeosperma arnoldii1 from the Fa2d of northeastern Pennsylvania, the oldest previously reported seed, and are more primitively organized than all except Genomos perma2,3.
XII.—On Salpingostoma dasu: A New Carboniferous Seed from East Lothian
  • W. Gordon
  • Geography
    Transactions of the Royal Society of Edinburgh
  • 1942
In a recent paper (Gordon, 1938) reasons were given for the belief that semi-arid conditions prevailed during Lower Carboniferous times in the neighbourhood of North Berwick, East Lothian. The
Distribution of anatomically-preserved floras in the Lower Carboniferous in Western Europe
ABSTRACT Twelve localities of Lower Carboniferous strata in Scotland (Loch Humphrey Burn, Glenarbuck, Pettycur, Oxroad Bay and the Berwickshire localities of Cove, Burnmouth, Gavinton, Edrom,