Abstract
The structure of the epidermis of Travisia forbesii was described using light and electron microscopy. The epidermis is a highly modified variant of the normal one-layer polychaete epithelium. It consists of basal epidermal cells and an external layer of closely sited papillae consisting of glandular and supportive epidermal cells, and extensive electron-transparent intercellular spaces. The papillae are embedded in the thick cuticle. Each papilla has a peduncle, which is formed by one cell that penetrates the inner cuticle layer to the basal epidermal cells. A fold of basement membrane forms the core of the peduncle and ends in the base of a papilla. All epidermal cells are connected to each other with apical cell junctions and to the basement membrane with hemidesmosomes, so the epithelium is continuous and uninterrupted. The epidermis has an intra-epidermal neuron plexus. The structure of the papillae is compared with papillae and tubercles of other polychaetes, and the possible functional significance and phylogenetic implications of these structures are discussed.
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Acknowledgments
We thank our colleagues from the Department of Invertebrate Zoology, Faculty of Biology, M.V. Lomonosov Moscow State University (MSU) and from the White Sea Biological Station (WSBS MSU) for the help during the collecting animals and their preparation for histological and ultrastructural research. We are especially grateful to G. P. Salkova (MSU), N. M. Biserova (MSU), A. G. Bogdanov (MSU) and A. A. Semenov (WSBS). The work was performed at the User Facilities Center of M.V. Lomonosov Moscow State University under financial support of the Ministry of Education and Science of the Russian Federation. Additional TEM research was done in the I.D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, and we thank S. I. Metelev for help. This work was supported by the Russian Foundation for Basic Research (Grant No. 11-04-01695-a) and by the Ministry of Education and Science of the Russian Federation (14.740.11.1049, 8334).
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Communicated by A. Schmidt-Rhaesa.
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Vodopyanov, S., Tzetlin, A. & Zhadan, A. The fine structure of epidermal papillae of Travisia forbesii (Annelida). Zoomorphology 133, 7–19 (2014). https://doi.org/10.1007/s00435-013-0204-5
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DOI: https://doi.org/10.1007/s00435-013-0204-5