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6 results for “Rangeomorphs”
Data for: Frond orientations with independent current indicators demonstrate the reclining rheotropic mode of life of several Ediacaran rangeomorph taxa
<p>Fossils from the deep-sea Ediacaran biotas of Newfoundland are among the oldest architecturally complex soft-bodied macroorganisms on Earth. Most organisms in the Mistaken Point-type biotas of Avalonia — particularly the fractal-branching frondose Rangeomorpha — have been traditionally interpreted as living erect within the water column during life. However, due to the scarcity of documented physical sedimentological proxies associated with fossiliferous beds, Ediacaran paleocurrents have been inferred in some instances from the preferential orientation of fronds. This calls into question the relationship between frond orientation and paleocurrents. In this study, we present an integrated approach from a newly described fossiliferous surface (the "Melrose Surface" in the Fermeuse Formation at Melrose, on the southern portion of the Catalina Dome in the Discovery UNESCO Global Geopark) combining: (1) physical sedimentological evidence for paleocurrent direction in the form of climbing ripple cross lamination, and (2) a series of statistical analyses based on modified polythetic and monothetic clustering techniques reflecting the circular nature of the recorded orientation of <em>Fractofusus</em> <em>misrai</em> specimens. This study demonstrates the reclining rheotropic mode of life of the Ediacaran rangeomorph taxon <em>Fractofusus</em> <em>misrai</em> and presents preliminary inferences suggesting a similar mode of life for <em>Bradgatia</em> sp. and <em>Pectinifrons</em> <em>abyssalis</em> based on qualitative evidence. These results advocate for the consideration of an alternative conceptual hypothesis for the position of life of Ediacaran organisms in which they are interpreted as having lived reclined on the seafloor, in the position that they are preserved.</p>
Data for: Frond orientations with independent current indicators demonstrate the reclining rheotropic mode of life of several Ediacaran rangeomorph taxa
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Data from: Palaeobiology and taphonomy of the rangeomorph (Culmofrons plumosa)
<p>The deep marine Ediacaran fossil record of Avalonia is dominated by the Rangeomorpha, a clade characterized by up to four orders of fractal-like branching. Despite their abundance and morphological diversity, little is known about their palaeobiology, palaeoecology and phylogenetic position in the tree of life. The clade has traditionally been interpreted as consisting of organisms that lived erect in the water column and tethered to the seafloor, based on the intuitive interpretation of their frondose body plan. However, recent work has challenged this view and instead proposes a reclining mode of life for several rangeomorph, possibly in symbiosis with chemoautotrophic bacteria. In this manuscript, we offer a detailed description of exceptionally preserved specimens of <em>Culmofrons plumosa</em> from the Discovery Unesco Geopoark in Newfoundland, CA. We suggest that <em>Culmofrons plumosa</em> should be reinterpreted as a reclining organism based on taphonomic and morphological evidence. Additionally, reproductive modes and a growth model of the species are here inferred, and they appear to be most consistent with a reclining mode of life, offering a novel palaeobiological reconstruction of the species.</p>
Supplementary data for: Hydrodynamic insights into the palaeobiology of the Ediacaran rangeomorph Fractofusus misrai
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Data from: Palaeobiology and taphonomy of the rangeomorph (Culmofrons plumosa)
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Data from: Anatomy of the Ediacaran rangeomorph Charnia masoni
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