Rodlet cells in the alimentary tract of three genera of lizardfishes (Synodontidae, Aulopiformes): more on these enigmatic gate-guards of fishes
Rodlet cells (RCs) of the alimentary tract were studied in lizardfishes (Synodontidae) of the three major genera: Synodus, Trachinocephalus and Saurida, collected from the Mediterranean, the Red Sea, the South-African coast and the Great Barrier Reef (GBR), Australia. In the studied species two form...
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Veröffentlicht in: | Cybium 2011, Vol.35 (2), p.121-129 |
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Zusammenfassung: | Rodlet cells (RCs) of the alimentary tract were studied in lizardfishes (Synodontidae) of the three major genera: Synodus, Trachinocephalus and Saurida, collected from the Mediterranean, the Red Sea, the South-African coast and the Great Barrier Reef (GBR), Australia. In the studied species two forms of RCs were revealed: one elongated, resembling those previously described from other fishes; and a second, bulbous in form, which was discovered in two species only, Saurida filamentosa and S. argentea from the GBR. In all species studied the cells are situated in the mucosal epithelium: the elongated form close to the luminal surface of the epithelium, and the bulbous form deep among the other cells. The two forms also differ in their microstructure, and their different positions in the epithelium activate different paths for release of the rodlets into the lumen. Each cell contains 15-30 rodlets, which change from round to needle-shaped during maturation, and are later released into the gut lumen. The development of the rodlets and the possible role of the RCs are discussed.Original Abstract: Les cellules a batonnets dans les voies alimentaires de trois genres de poissons lezard (Aulopiformes, Synodontidae); des elements supplementaires sur ces enigmatiques "gardiens de portes" des poissons. Les cellules a batonnets (RCs) des voies alimentaires ont ete etudiees dans les trois genres majeurs de Synodontidae : Synodus, Trachinocephalus et Saurida, recueillis en mer Mediterranee, en mer Rouge, sur la cote d'Afrique du Sud et de la Grande Barriere de Corail (GBR) en Australie. Dans les especes etudiees, deux formes de RCs sont observees : une allongee, qui ressemble a celles qui ont ete decrites anterieurement chez d'autres especes et une seconde forme bulbeuse, trouvee seulement chez deux especes, Saurida filamentosa et S. argentea de GBR. Chez toutes ces especes, les cellules sont situees dans l'epithelium muqueux : la forme allongee proche de la surface luminale de la muqueuse et la bulbeuse en profondeur parmi les cellules muqueuses. Les deux formes different aussi dans leurs microstructures et leurs differentes positions dans l'epithelium activent des chemins differents concernant la liberation des batonnets a l'interieur du lumen. Chaque cellule contient 15 a 30 batonnets qui, pendant la maturation, se transforment d'une forme ronde a une forme plus aculeiforme et ensuite sont liberes dans la lumiere intestinale. Le developpement des batonnets et le role |
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ISSN: | 0399-0974 |