Fine structure of the photogenous areas in the bioluminescent ophiuroidAmphipholis squamata (Echinodermata,Ophiuridea) |
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Authors: | D Deheyn V Alva M Jangoux |
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Institution: | (1) Laboratoire de Biologie Marine CP 160/15, Université Libre de Bruxelles, 50 Avenue FD Roosevelt, B-1050 Bruxelles, Belgium Tel. +32 2 650 22 34; Fax +32 2 650 27 96 e-mail ddeheyn@ulb.ac.be, BE;(2) Institut de Ciènces del mar (CSIC), Passeig Joan de Borbò s/n, E-08039, Barcelona, Spain, ES;(3) Laboratoire de Biologie Marine, Université de Mons-Hainaut, 19 Avenue Maistriau, B-7000 Mons, Belgium, BE |
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Abstract: | Amphipholis squamata is a small bioluminescent ophiuroid whose arms are the only body part to produce light. The morphology of the arms was described
paying particular attention to the spinal ganglia, viz the areas of most intense luminescence. Spinal ganglia consist of five
different cell types (A–E) which were studied at different stages of the photogenous reaction. Type D cells have numerous
irregularlyshaped vacuoles, widespread Golgi apparatus and well-developed rough endoplasmic reticulum (RER) that show obvious
ultrastructural changes after luminescence. Type D cells appear, therefore, to be the best photocyte candidate. Type B and
C cells were frequently observed in the nervous system outside spinal ganglia. Type A and E cells have not been described
before. Type A cells are ciliated cells and type E cells extend long processes which are intimately associated with type D
cells and epidermal ciliated cells. Both type A and type E cells could take part to the stimulation pathway that triggers
luminescence.
Accepted: 1 September 1996 |
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