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Zoomorphology

, Volume 117, Issue 1, pp 41–48 | Cite as

Epidermal ultrastructure of Seison nebaliae and Seison annulatus, and a comparison of epidermal structures within the Gnathifera

  • W. H. Ahlrichs
ORIGINAL ARTICLE

Abstract

 The epidermis of both species of Seison is syncytial and has a characteristic internal layer divided into two distinct sublayers. Sublayer I is very thin (0.03 μm) and bounded to the outer cell membrane of the epidermis. Sublayer II is 0.5 μm thick and separated from sublayer I by a thin layer of cytoplasm. Intrusions of the outer cell membrane of the epidermis perforate the internal layer, before terminating within the cytoplasm. The intrusions of the cell membrane of S. annulatus are coated by an electron-dense material, the annulus, when passing through the internal layer. Bundles of filaments are present in the epidermis of S. nebaliae. A comparison of epidermal structures within the Gnathifera Ahlrichs, 1995, confirms phylogenetic relationships earlier proposed by the author.

Keywords

Cell Membrane Thin Layer Phylogenetic Relationship Outer Cell Internal Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • W. H. Ahlrichs
    • 1
  1. 1.II. Zoologisches Institut und Museum der Universität Göttingen, Berliner Strasse 28, D-37073 Göttingen, GermanyDE

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