Formation and degeneration of scaled capillary notochaetae in Owenia fusiformis Delle Chiaje, 1844 (Oweniidae, Annelida)
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Phylotranscriptomic studies of the past decade have repeatedly placed Oweniidae together with Magelonidae, as the sister group to remaining annelids. This newly established placement clearly makes them a key-lineage for understanding annelid evolution and morphology. One of the most prominent morphological features of all annelids are their chaetae. The arrangement and formation process (chaetogenesis) of these chitinous bristles have been studied extensively in hooked chaetae that are arranged in rows. However, the information on other types of chaetae is still scarce. In this study, we investigated the scaled capillary notochaetae of Owenia fusiformis, looking both into the formation process that causes the scaly surface ornamentation and into their arrangement within tight bundles. Our results demonstrate the incredible plasticity of chaetogenesis that allows forming a vast array of three-dimensional structures. The capillary chaetae of Owenia fusiformis are unique in lacking an enamel coating and the scales covering the apical surface of each chaeta are formed by a single microvillus of the chaetoblast. Furthermore, the bundle of chaetae has a peripherally located formative site and a central degenerative site and it appears to result from a secondary curling of the chaetal sac.
Originalsprog | Engelsk |
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Tidsskrift | Zoomorphology |
Vol/bind | 141 |
Udgave nummer | 1 |
Sider (fra-til) | 43-56 |
Antal sider | 14 |
ISSN | 0720-213X |
DOI | |
Status | Udgivet - 2022 |
Bibliografisk note
Funding Information:
We would like to thank the Station Marine de Concarneau for their support in collecting the here examined specimens. We are also grateful to Dr. Gregor Kirfel at the Institute for Cell Biology in Bonn for his support with the use of FEI Verios 460L scanning electron microscope, funded by State of North Rhine-Westphalia and the Deutsche Forschungsgemeinschaft (INST 217/784-1 FUGG). Further thanks are due to Tatjana Bartz for her assistance in laboratory work. The µCT-scanner was funded by the State of North Rhine-Westphalia and the Deutsche Forschungsgemeinschaft (INST 217/849-1 FUGG).
Publisher Copyright:
© 2021, The Author(s).
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