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J. Moll. Stud. (1987), 53, 129-138
© The Malacological Society of London 1987

research-article

THE STRUCTURE OF THE SECONDARY GILLS OF SIPHONARIA CAPENSIS (GASTROPODA: PULMONATA)

C.J. de VILLIERS and A.N. HODGSON*

Department of Zoology & Entomology, Rhodes University Grahamstown 6140, South Africa

*All correspondence to: Dr. A.N. Hodgson, Department of Zoology, Rhodes University, Grahamstown 6140, South Africa

The secondary gill of the pulmonate limpet Siphonaria capensis is located in the dorsal portion of the mantle cavity. Each lamella of the gill is triangular in shape and bears ciliary tufts which have a density of about 400/mm2. The free ends of some of the cilia are enlarged biconcave discs. Each gill lamella is covered by a single layer of cuboidal (4x4 µm) epithelium on each side, separated by a central haemocoelic space. Ciliated and mucus secreting cells are interspersed amongst the epithelial cells. The haemocoelic space is spanned at intervals by trabeculae containing longitudinal and transverse muscle fibres.

(Received 29 August 1986;
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