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Chaetal arrangement in Orbiniidae (Annelida, Polychaeta) and its significance for systematics

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Abstract

The systematic position of Orbiniidae within Polychaeta is still uncertain. In order to provide additional comparative data, we investigated the chaetal arrangement in this family, which is considered valuable for polychaete systematics. Specimens of Scoloplos armiger, Orbinia latreillii, and Pettibonella multiuncinata were examined by SEM and serial sections analysed by computer aided 3D-reconstructions. The obtained data suggest that the chaetal arrangement of Orbiniidae resembles that of other sedentary polychaetes in only a few respects. Transverse rows are only present in the main, anterior part of the chaetal patches of thoracic neuropods. The position of the formative site indicates homology with the transverse rows of several sedentary polychaete taxa. The chaetal patches thus differ significantly from those known in Apistobranchidae. Independent rows with an own caudal formative site, which run along the caudoventral edge of the chaetal patches, resemble the neuropodial ventral longitudinal rows known in Spionidae and related taxa. The abdominal neuropodia of S. armiger and O. latreillii bear longitudinal rows of chaetae. These are reorientated during ontogenetic chaetiger transformation and become the transverse rows of the thoracic chaetal patches. 3D reconstruction of S. armiger revealed that the notopodial chaetal bundles are organized in rows as well. Notopodia and abdominal neuropodia bear deep reaching supportive chaetae. They are the first chaetae formed during neuropodial development and reside dorsally to the longitudinal row of capillary chaetae. Neither position nor structure indicates homology with the supportive chaetae of other sedentary polychaetes. Spionidae and related taxa are thus the only sedentary polychaetes, which specifically resemble Orbiniidae in certain aspects of their chaetal arrangement.

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Acknowledgments

Our thanks are due to C. Bleidorn, who gave helpful remarks on orbiniid ingroup relationship, T. Bartolomaeus for support and discussion and L. Vogt, D. Eibye-Jacobsen and two anonymous reviewers, whose comments improved the manuscript. S. Albrecht gave worthful hints for sampling juvenile S. armiger. This work was financially supported by DFG (HA 443/2-1).

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  1. Institute for Biology, Animal Systematics and Evolution, Free University Berlin, Königin-Luise-Str. 1-3, 14195, Berlin, Germany

    Sabine Hoffmann & Harald Hausen

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  1. Sabine Hoffmann
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  2. Harald Hausen
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Correspondence to Sabine Hoffmann.

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Dedicated to Prof. Dr. Wilfried Westheide on the occasion of his 70th birthday.

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Hoffmann, S., Hausen, H. Chaetal arrangement in Orbiniidae (Annelida, Polychaeta) and its significance for systematics. Zoomorphology 126, 215–227 (2007). https://doi.org/10.1007/s00435-007-0042-4

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  • DOI: https://doi.org/10.1007/s00435-007-0042-4

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