Decay of vertebrate characters in hagfish and lamprey (Cyclostomata) and the implications for the vertebrate fossil record
| Autor: | Sarah E. Gabbott, Mark A. Purnell, Robert S. Sansom |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Cyclostomata
General Immunology and Microbiology biology Fossils Myxine Lamprey Lampreys Vertebrate Zoology Context (language use) General Medicine biology.organism_classification Biological Evolution Haikouichthys General Biochemistry Genetics and Molecular Biology Cartilage Lampetra biology.animal Animals Hagfishes General Agricultural and Biological Sciences Phylogeny Research Articles General Environmental Science Hagfish |
| Zdroj: | Proceedings of the Royal Society B: Biological Sciences. 278:1150-1157 |
| ISSN: | 1471-2954 0962-8452 |
| DOI: | 10.1098/rspb.2010.1641 |
| Popis: | The timing and sequence of events underlying the origin and early evolution of vertebrates remains poorly understood. The palaeontological evidence should shed light on these issues, but difficulties in interpretation of the non-biomineralized fossil record make this problematic. Here we present an experimental analysis of decay of vertebrate characters based on the extant jawless vertebrates ( Lampetra and Myxine ). This provides a framework for the interpretation of the anatomy of soft-bodied fossil vertebrates and putative cyclostomes, and a context for reading the fossil record of non-biomineralized vertebrate characters. Decay results in transformation and non-random loss of characters. In both lamprey and hagfish, different types of cartilage decay at different rates, resulting in taphonomic bias towards loss of ‘soft’ cartilages containing vertebrate-specific Col2α1 extracellular matrix proteins; phylogenetically informative soft-tissue characters decay before more plesiomorphic characters. As such, synapomorphic decay bias, previously recognized in early chordates, is more pervasive, and needs to be taken into account when interpreting the anatomy of any non-biomineralized fossil vertebrate, such as Haikouichthys , Mayomyzon and Hardistiella . |
| Databáze: | OpenAIRE |
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