Summary
The embryonic development and ultrastructure of three pairs of vesicle-organs, ectodermal in origin, in the heads ofSepia officinalis, Loligo vulgaris andLoligo forbesi hatchlings is studied. Between the two pairs of organs located in the anterior part and the pair in the posterior head region, different structures and ultrastructures develop during embryogenesis. The function of the anterior pairs can not be determined. The posterior pair are presumed to be rhabdomeric, photosensitive organs because of the presence of bipolar sensory cells. At their apical, luminal surface numerous long, irregular microvilli protrude — similar to the neurons of various simple rhabdomeric photoreceptors in invertebrates.
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Sundermann, G. Development and hatching state of ectodermal vesicle-organs in the head ofSepia officinalis, Loligo vulgaris andLoligo forbesi (Cephalopoda, Decabrachia). Zoomorphology 109, 343–352 (1990). https://doi.org/10.1007/BF00803575
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DOI: https://doi.org/10.1007/BF00803575