00000nam 2200000za 4500 9.812491 CaOODSP 20221107141333 cr ||||||||||| 160412s2016 onc ob f000 0 eng d 978-0-660-04793-5 CaOODSP eng eng fre n-cn--- Fs97-6/3161E-PDF Murray, Harry M. (Harry Michael), 1966- An ultrastructural description of the epidermis and cuticle from Ophryotrocha cyclops, sp.nov. (Eunicida: Dorvilleidae), a small polychaete recently identified from salmonid aquaculture sites on the south coast of Newfoundland [electronic resource] / by H.M. Murray [Ottawa] : Fisheries and Oceans Canada, c2016. vi, 12 p. : fig. Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3161 Includes bibliographical references (p. 7-10). Epidermal and cuticular ultrastructure of Ophryotrocha cyclops, a newly described species of Dorvilleidae was investigated using histology and electron microscopy. The integument consisted of a cuticular and epicuticular layer, an underlying epidermis, and a subepidermal region characterized by cellular and connective tissue components. The epidermis was populated by support cells some of which were observed to be multiciliated. Histochemical staining indicated that the layer was rich in mucopolysaccarides. The support cells were columnar or cuboidal with basal nuclei and an apical cytoplasm containing many membrane-bound vesicles and mitochondria suggesting metabolic activity. The ciliated cells were arranged in tufts and the cilia were of the typical 9 + 2 configuration. Basal structures with striated rootlets anchored the cilia in the cytoplasm. The apical membrane of the epidermal cells was folded into microvilli which extended into the cuticle. Microvilli extended through the cuticle to the epicuticular surface. The cuticle was composed of regular fibrous bands oriented parallel to the apical surface of support cells. The epicuticle appeared non-fibrous and was composed of two layers of differing electron density. This description is one of only a few studies investigating the cellular organization of Ophryotrocha sp. epidermis and contributes to our understanding of basic structure and function. gccst Fish farming gccst Aquatic animals gccst Physiology Canada. Department of Fisheries and Oceans. Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3161 (CaOODSP)9.504449 PDF 633 KB https://publications.gc.ca/collections/collection_2016/mpo-dfo/FS97-6-3161-eng.pdf