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The shell glands in some calanoid copepods (Crustacea)

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This study represents the first structural, ultrastructural, and biochemical investigation of the shell glands in calanoid copepods. These glands, located inside the points of the last prosomal segment, constitute voluminous syncytial secretory units, each of which extends into an excretory canalicule with a cellular or syncytial wall. The canalicules merge into two collector canals, or shell ducts, that rejoin the oviducts and then open into the egg-laying ducts. Each secretory unit synthesizes heterogeneous granules containing both light and predominantly dense material. Exocytosis of these mature secretory granules occurs in an apical excretory chamber. In freshwater species, the modifications observed during the secretory cycle emphasize a gradual discharge from the secretory units in the hours following laying. Cytochemical and biochemical studies of the secretions reveal the presence of N-acetylglucosamine, galactose, and N-acetylgalactosamine glycoconjugated proteins.

Cette étude représente la première investigation structurale, ultrastructurale et biochimique sur les glandes coquillières des copépodes calanoïdes. Ces glandes, situées dans les pointes du prosome, sont constituées de volumineuses unités sécrétrices syncytiales prolongées par des canalicules excréteurs à paroi cellulaire ou syncytiale. Ceux-ci se réunissent en deux canaux collecteurs ou canaux coquilliers rejoignant les oviductes puis débouchant dans la partie distale des canaux de ponte. Chaque unité sécrétrice produit des granules dont chacun contient deux types de matériel, clair et dense prédominant, exocytés dans une chambre d'excrétion apicale. Chez les calanoïdes dulçaquicoles, les modifications observées au cours du cycle sécrétoire témoignent d'une décharge progressive des unités sécrétrices dans les quelques heures qui suivent la ponte des œufs dans les sacs ovigères. Les études cyto- et bio-chimiques des sécrétions mettent en évidence la présence de protéines conjuguées à trois types d'oses, N-acétylglucosamine, galactose et N-acétylgalactosamine.

Document Type: Research Article

Publication date: 2001-08-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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