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image of Journal of Crustacean Biology

ABSTRACT Three types of eyes have been observed in three different lineages of the Stomatopoda. In the Gonodactyloidea and the Squilloidea, the cornea is divided into two halves by a line of specialized ommatidia, the middle band. This band is two facets wide in the squilloids, and occupies a small portion, about 4 per cent, of the surface area of the cornea. In gonodactyloids the band is six facets wide and occupies much more of the surface area of the cornea, between 15 and 38 per cent. The middle band appears to be absent in the bathysquilloids. The greater development of the middle band in the gonodactyloid lineage than in the other lineages may be related to binocular vision and the strike of the raptorial appendage, light available in the habitat, and/or the complex behavioral patterns developed by some members of this group.

Affiliations: 1: (RBM) Department of Invertebrate Zoology (Crustacea), National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560; 2: (HS) Istituto di Scienze dell' Informazione, Università di Torino, Corso M. d'Azeglio, 42, 10125 Torino, Italy; 3: (BCA) Department of Biological Sciences, University of Southern California, Los Angeles, California 90007.


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