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Ultrastructure of pigmented eyes in Onuphidae and Eunicidae (Annelida: Errantia: Eunicida) and its importance in understanding the evolution of eyes in Annelida

  • Tim von PalubitzkiEmail author
  • Günter Purschke
Original Paper
  • 99 Downloads

Abstract

Annelida displays enormous eye and photoreceptor cell (PRC) diversity. In polychaetes, larval and adult eyes can be readily distinguished as the former are small, inverse and comprised of only two or three cells, and the latter are usually everse and multicellular. However, there are some species in which adult eyes are small, fewer in number or even absent. Recent studies show that two pairs of multicellular adult eyes belong to the ground pattern of a clade comprising Amphinomida/Sipuncula and Pleistoannelida with Errantia and Sedentaria. As ultrastructural data in one higher taxon of Errantia, Eunicida, are scarce or completely lacking for certain subgroups, we investigated the structure of pigmented eyes in three species of eunicidan bristle worms: Aponuphis bilineata (Onuphidae), Paucibranchia bellii (Eunicidae) and Leodice cf. torquata (Eunicidae). All had two pairs of pigmented eyes possessing typical adult structures: rhabdomeric PRCs (rPRC), pigmented supportive cells (PSCs) and additional cell types (in some species). The PSCs formed a shading pigment cup housing the sensory processes of the PRCs in everse orientation. Both Eunicidae species examined possess a lens-like structure formed by extensions of the PSCs as typical for members of Errantia, suggesting that lens-like structures formed by PSC processes were acquired in the stem lineage of Errantia and represent an autapomorphy of this clade. Our observations provide further evidence for the presence of two pairs of adult eyes in the ground pattern of Amphinomida/Sipuncula and Pleistoannelida.

Keywords

Photoreceptor cells Adult eyes Larval eyes Polychaetes Pigmented supportive cells Converse eyes Inverse eyes 

Notes

Acknowledgements

We are grateful to the head of our department, Prof Dr. A. Paululat, Osnabrueck, for various kinds of support. Special thanks go to Dr. C. H. G. Müller, Greifswald, for providing additional material of P. bellii. Thanks are due to Mrs. K. Etzold and Mr. W. Mangerich, Osnabrueck, for various kinds of technical assistance, particularly for introducing TvP to electron microscopy techniques.

Compliance with ethical standards

We neither used endangered species nor collected animals from protected areas and we followed all applicable international, national and/or institutional guidelines for the care and use of animals.

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Zoology and Developmental Biology, Department of Biology and ChemistryUniversity of OsnabrückOsnabrückGermany
  2. 2.LippetalGermany

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