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The Morphology and Life History of the Cestode, Bertiella Studeri¹

The problem of specific identity in the genus Bertiella is discussed. Three mature cestodes from a monkey, Macacus rhesus, are identified tentatively as Bertiella studeri. The animal probably acquired the infection in India, but had been in Hamburg for at least six months. The worms and eggs are described and life history experiments are reported. Eggs from gravid proglottids were fed to twenty-four species of free-living mites, collected from different locations in the vicinity of Hamburg. Onchospheres and developing larvae were recovered from the body cavity of Notaspis coleoptratus, Scutovertex minutus, Scheloribates laevigatus and Galumna sp. Cysticercoids were removed from S. laevigatus and Galumna sp. They were spherical, to oval, to pyriform, 0.1 to 0.15 mm. in diameter, and provided with small cercomeres. It is clear therefore that Bertiella, like other anoplocephaline cestodes, Moniezia and Cittotaenia, utilizes free-living mites as intermediate hosts.

¹ Contribution from the Institut für Schiffs- und Tropenkrankheiten, Hamburg, Deutschland, and New York University.

For facilities at the Institut and for material, I am indebted to the Director, Prof. Dr. P. Mühlens and to Dr. H. Vogel, Vorsteher der Helminthologischen Abteilung. Opportunity for the study was provided by sabbatical leave from New York University and by a grant from the Oberlaender Trust, Philadelphia, Pa.