Constructional and functional morphology of Ediacaran rangeomorphs

Butterfield, N. J. (2020) Constructional and functional morphology of Ediacaran rangeomorphs. Geological Magazine. ISSN 0016-7568, ESSN: 1469-5081 DOI https://doi.org/10.1017/S0016756820000734

[img] Text
Butterfield+Geol+Mag+revised2.pdf - Accepted Version

Download (161kB)
[img] Text
constructional-and-functional-anatomy-of-ediacaran-rangeomorphs.pdf - Published Version
Available under License Creative Commons Attribution.

Download (4MB)
[img]
Preview
Image
Geol+Mag+Fig+1.tif - Supplemental Material

Download (7MB) | Preview
[img]
Preview
Image
Geol+Mag+Fig+2.tif - Supplemental Material

Download (8MB) | Preview
[img]
Preview
Image
Geol+Mag+Fig+3c.tif - Supplemental Material

Download (29MB) | Preview
[img] Image
Geol+Mag+Fig+4b.eps - Supplemental Material

Download (1MB)
Official URL: https://www.cambridge.org/core/journals/geological...

Abstract

Ediacaran rangeomorphs were the first substantially macroscopic organisms to appear in the fossil record, but their underlying biology remains problematic. Although demonstrably heterotrophic, their current interpretation as osmotrophic consumers of dissolved organic carbon (DOC) is incompatible with the inertial (> Re) and advective (> Pe) fluid-dynamics accompanying macroscopic length-scales. The key to resolving rangeomorph feeding and physiology lies in their underlying construction. Taphonomic analysis of three-dimensionally preserved Charnia from the White Sea identifies the presence of large, originally water-filled compartments that served both as a hydrostatic exoskeleton and semi-isolated digestion chambers capable of processing recalcitrant substrates – likely in conjunction with a resident microbiome. At the same time, the hydrodynamically exposed outer surface of macroscopic rangeomorphs would have dramatically enhanced both gas exchange and food delivery. A bag-like epithelium filled with transiently circulated seawater offers an exceptionally efficient means of constructing a simple, DOC-consuming, multicellular heterotroph. Such a bodyplan is broadly comparable to that of anthozoan cnidarians – minus such derived features as muscle, tentacles and a centralized mouth. Along with other early bag-like fossils, rangeomorphs can be reliably identified as total-group eumetazoans, potentially colonial stem-group cnidarians.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: Geological Magazine
Identification Number: https://doi.org/10.1017/S0016756820000734
Depositing User: Sarah Humbert
Date Deposited: 27 Jun 2020 00:31
Last Modified: 21 Dec 2020 01:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/4770

Actions (login required)

View Item View Item

About cookies