Abstract

The ultrastructure pf Besnoitia cysts in reindeer is described. The observations made on Besnoitia cysts and merozoites indicate a form distinct enough to be placed in a new species - Besnoitia tarandi.

Highlights

  • The presence of Besnoitia cysts in reindeer is a common finding (Hawden dC Palmer 1922, N i kolaevskii 1961, Nordkvist 1966, Choquette et al 1967, Skjenneberg 5c Slagsvold 1968, Rehbinder et al 1981)

  • The observations made on Besnoitia cysts and merozoites indicate a form distinct enough to be placed in a new species - Besnoitia tarandi

  • The cyst wall appears to be composed of two layers, a parasitophorous vacuole of a hypertrophied multinucleated cell and a surrounding homogenous extracellular capsule

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Summary

Introduction

The presence of Besnoitia cysts in reindeer is a common finding (Hawden dC Palmer 1922, N i kolaevskii 1961, Nordkvist 1966, Choquette et al 1967, Skjenneberg 5c Slagsvold 1968, Rehbinder et al 1981). Little is known about the morphology of the parasite in reindeer. The aim of the present investigation was to study the ultrastructure of the Besnoitia cysts and the cyst content of merozoites from reindeer. After embedding in Epon, 1 mm thick sections were cut and stained with toluidine blue for light microscopy. Ultrathin sections were prepared on an L K B ultratome, picked up on formvar coated and uncoated copper grids, stained with uranyl acetate and lead citrate and examined in a Philips electron microscope 420, at 60 kv, at magnifications varying between 1 000 and 60 000

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