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Fossilized spermatozoa preserved in a 50-Myr-old annelid cocoon from Antarctica
The origin and evolution of clitellate annelids—earthworms, leeches and their relatives—is poorly understood, partly because body fossils of these delicate organisms are exceedingly rare. The distinctive egg cases (cocoons) of Clitellata, however, are relatively common in the fossil record, although...
| Autores principales: | , , , , |
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
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The Royal Society
2015
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| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4528455/ https://www.ncbi.nlm.nih.gov/pubmed/26179804 http://dx.doi.org/10.1098/rsbl.2015.0431 |