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Observations on the cuticular photophores of the sergestid shrimp Sergia grandis (Sund, 1920)

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The structure and ultrastructure of cuticular photophores in the antennal scale and the limbs of Sergia grandis (Sund, 1920) are described. The photophores consist of rows of columnar cells that serve as conductive guides for the light produced by the photogenic cells surrounding their inner ends. These latter cells are filled with highly-organized cytoplasmic material arranged in a three-dimensional lattice which we presume contains the light generating materials. A thin layer of cells containing a reflecting pigment serves as a tapetum. The photophore is well supplied with blood vessels, and there are a large number of haemocytes within the photophore. The columnar and photogenic cells rest on an epithelium. Growth in diameter of the photophore occurs at the periphery, where young columnar cells are short and narrow. In addition, senescent columnar cells are replaced by cells generated from the underlying epithelium. These photophores are compared with regions in the dendrobranchiate shrimp, Gennadas valens (Smith, 1884) which have similarities in their gross appearance and have previously been suggested as putative photophores.

La structure et l'ultrastructure des photophores cuticulaires de l'écaille antennaire et des appendices de Sergia grandis (Sund, 1920) sont décrites. Les photophores consistent en rangées de cellules columnaires qui servent de guide pour la lumière produite par les cellules photogènes entourant leurs extrémité interne. Ces dernières cellules sont remplies de matériel cytoplasmique hautement organisé disposé en structure tridimensionelle, qui contient, pensons nous, le matériel producteur de lumière. Une fine couche de cellules contenant un pigment réfléchissant sert de tapetum. Le photophore est richement vascularisé et contient un grand nombre d'hémocytes. Les cellules columnaires et photogènes reposent sur un épithélium. La croissance en diamètre du photophore intervient sur sa périphérie où les jeunes cellules columnaires sont courtes et étroites. De plus, les cellules columnaires

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