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Ecological innovations in the Cambrian and the origins of the crown group phyla

Budd, Graham and Jackson, Illiam LU (2015) In Philosophical Transactions of the Royal Society B: Biological Sciences 371(1685).
Abstract
Simulation studies of the early origins of the modern phyla in the fossil record, and the rapid diversification that led to them, show that these are inevitable outcomes of rapid and long-lasting radiations. Recent advances in Cambrian stratigraphy have revealed a more precise picture of the early bilaterian radiation taking place during the earliest Terreneuvian Series, although several ambiguities remain. The early period is dominated by various tubes and a moderately diverse trace fossil record, with the classical ‘Tommotian’ small shelly biota beginning to appear some millions of years after the base of the Cambrian at ca 541 Ma. The body fossil record of the earliest period contains a few representatives of known groups, but most of... (More)
Simulation studies of the early origins of the modern phyla in the fossil record, and the rapid diversification that led to them, show that these are inevitable outcomes of rapid and long-lasting radiations. Recent advances in Cambrian stratigraphy have revealed a more precise picture of the early bilaterian radiation taking place during the earliest Terreneuvian Series, although several ambiguities remain. The early period is dominated by various tubes and a moderately diverse trace fossil record, with the classical ‘Tommotian’ small shelly biota beginning to appear some millions of years after the base of the Cambrian at ca 541 Ma. The body fossil record of the earliest period contains a few representatives of known groups, but most of the record is of uncertain affinity. Early trace fossils can be assigned to ecdysozoans, but deuterostome and even spiralian trace and body fossils are less clearly represented. One way of explaining the relative lack of clear spiralian fossils until about 536 Ma is to assign the various lowest Cambrian tubes to various stem-group lophotrochozoans, with the implication that the groundplan of the lophotrochozoans included a U-shaped gut and a sessile habit. The implication of this view would be that the vagrant lifestyle of annelids, nemerteans and molluscs would be independently derived from such a sessile ancestor, with potentially important implications for the homology of their sensory and nervous systems. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Philosophical Transactions of the Royal Society B: Biological Sciences
volume
371
issue
1685
pages
12 pages
external identifiers
  • scopus:84947967653
DOI
10.1098/rstb.2015.0287
language
English
LU publication?
no
id
9bbd2ae9-b4fd-45cd-9862-103ddc502d3c
date added to LUP
2018-03-01 13:46:03
date last changed
2018-10-21 04:54:23
@article{9bbd2ae9-b4fd-45cd-9862-103ddc502d3c,
  abstract     = {Simulation studies of the early origins of the modern phyla in the fossil record, and the rapid diversification that led to them, show that these are inevitable outcomes of rapid and long-lasting radiations. Recent advances in Cambrian stratigraphy have revealed a more precise picture of the early bilaterian radiation taking place during the earliest Terreneuvian Series, although several ambiguities remain. The early period is dominated by various tubes and a moderately diverse trace fossil record, with the classical ‘Tommotian’ small shelly biota beginning to appear some millions of years after the base of the Cambrian at ca 541 Ma. The body fossil record of the earliest period contains a few representatives of known groups, but most of the record is of uncertain affinity. Early trace fossils can be assigned to ecdysozoans, but deuterostome and even spiralian trace and body fossils are less clearly represented. One way of explaining the relative lack of clear spiralian fossils until about 536 Ma is to assign the various lowest Cambrian tubes to various stem-group lophotrochozoans, with the implication that the groundplan of the lophotrochozoans included a U-shaped gut and a sessile habit. The implication of this view would be that the vagrant lifestyle of annelids, nemerteans and molluscs would be independently derived from such a sessile ancestor, with potentially important implications for the homology of their sensory and nervous systems.},
  articleno    = {371 20150287},
  author       = {Budd, Graham and Jackson, Illiam},
  language     = {eng},
  month        = {11},
  number       = {1685},
  pages        = {12},
  series       = {Philosophical Transactions of the Royal Society B: Biological Sciences},
  title        = {Ecological innovations in the Cambrian and the origins of the crown group phyla},
  url          = {http://dx.doi.org/10.1098/rstb.2015.0287},
  volume       = {371},
  year         = {2015},
}