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J. Moll. Stud. (1989), 55, 313-321
© The Malacological Society of London 1989

research-article

ULTRASTRUCTURE AND HISTOCHEMISTRY OF THE POSTERIOR OESOPHAGUS OF NASSARIUS RETICULATUS (LINNAEUS)

CATHY M. PAYNE and MARY CRISP

Department of Biological Sciences The University, Dundee DD1 4HN

The posterior oesophagus of N. reticulatus (Linnaeus) consists of two histologically distinct regions. The epithelium of the thickened segment in the visceral haemocoel is virtually uniform. The cells are lipid-rich and can take up lipid from food. In addition, enzyme histochemistry indicates a capacity for the uptake of sugars and amino acids. The basal plasmalemma is elaborately infolded and associated with numerous elongate mitochondria, features indicating an active ion pump. The physiological role of this pump is unknown.

(Received 26 March 1985; accepted 10 May 1985)


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