Research Repository

Back in time: a new systematic proposal for the Bilateria

Baguñà, Jaume and Martinez, Pere and Paps, Jordi and Riutort, Marta (2008) 'Back in time: a new systematic proposal for the Bilateria.' Philosophical Transactions of the Royal Society B: Biological Sciences, 363 (1496). pp. 1481-1491. ISSN 0962-8436

[img] Text
2008 Baguna Back in Time Bilateria PhilTrRS.pdf
Restricted to Repository staff only

Download (298kB) | Request a copy


<jats:p>Conventional wisdom suggests that bilateral organisms arose from ancestors that were radially, rather than bilaterally, symmetrical and, therefore, had a single body axis and no mesoderm. The two main hypotheses on how this transformation took place consider either a simple organism akin to the planula larva of extant cnidarians or the acoel Platyhelminthes (planuloid–acoeloid theory), or a rather complex organism bearing several or most features of advanced coelomate bilaterians (archicoelomate theory). We report phylogenetic analyses of bilaterian metazoans using quantitative (ribosomal, nuclear and expressed sequence tag sequences) and qualitative (HOX cluster genes and microRNA sets) markers. The phylogenetic trees obtained corroborate the position of acoel and nemertodermatid flatworms as the earliest branching extant members of the Bilateria. Moreover, some acoelomate and pseudocoelomate clades appear as early branching lophotrochozoans and deuterostomes. These results strengthen the view that stem bilaterians were small, acoelomate/pseudocoelomate, benthic organisms derived from planuloid-like organisms. Because morphological and recent gene expression data suggest that cnidarians are actually bilateral, the origin of the last common bilaterian ancestor has to be put back in time earlier than the cnidarian–bilaterian split in the form of a planuloid animal. A new systematic scheme for the Bilateria that includes the Cnidaria is suggested and its main implications discussed.</jats:p>

Item Type: Article
Uncontrolled Keywords: Bilateria; Cnidaria; Acoela; Nemertodermatida; molecular phylogeny; microRNA
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Q Science > QL Zoology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 18 Jul 2017 13:38
Last Modified: 18 Aug 2022 10:42

Actions (login required)

View Item View Item