A new Devonian euthycarcinoid reveals the use of different respiratory strategies during the marine-to-terrestrial transition in the myriapod lineage.

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State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_6E955884C456
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A new Devonian euthycarcinoid reveals the use of different respiratory strategies during the marine-to-terrestrial transition in the myriapod lineage.
Journal
Royal Society open science
Author(s)
Gueriau P., Lamsdell J.C., Wogelius R.A., Manning P.L., Egerton V.M., Bergmann U., Bertrand L., Denayer J.
ISSN
2054-5703 (Print)
ISSN-L
2054-5703
Publication state
Published
Issued date
10/2020
Peer-reviewed
Oui
Volume
7
Number
10
Pages
201037
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
Myriapods were, together with arachnids, the earliest animals to occupy terrestrial ecosystems, by at least the Silurian. The origin of myriapods and their land colonization have long remained puzzling until euthycarcinoids, an extinct group of aquatic arthropods considered amphibious, were shown to be stem-group myriapods, extending the lineage to the Cambrian and evidencing a marine-to-terrestrial transition. Although possible respiratory structures comparable to the air-breathing tracheal system of myriapods are visible in several euthycarcinoids, little is known about the mechanism by which they respired. Here, we describe a new euthycarcinoid from Upper Devonian alluvio-lagoonal deposits of Belgium. Synchrotron-based elemental X-ray analyses were used to extract all available information from the only known specimen. Sulfur X-ray fluorescence (XRF) mapping and spectroscopy unveil sulfate evaporation stains, spread over the entire slab, suggestive of a very shallow-water to the terrestrial environment prior to burial consistent with an amphibious lifestyle. Trace metal XRF mapping reveals a pair of ventral spherical cavities or chambers on the second post-abdominal segment that do not compare to any known feature in aquatic arthropods, but might well play a part in air-breathing. Our data provide additional support for amphibious lifestyle in euthycarcinoids and show that different respiratory strategies were used during the marine-to-terrestrial transition in the myriapod lineage.
Keywords
X-ray fluorescence imaging, X-ray spectroscopy, air-breathing, fossil arthropods, synchrotron radiation, terrestrialization
Pubmed
Web of science
Open Access
Yes
Create date
23/11/2020 13:30
Last modification date
20/01/2021 7:09
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