Phase and Caste Determination in Insects: Endocrine Aspects by Martin Lüscher

By Martin Lüscher

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An electronmicroscopic view (Fig. 5) of a malformed eye shows a clearly defined border between normal and altered structures. These malformations are always directed to the forehead and differ from a small sickle to a complete alteration of both the eyes. Interesting enough, outer border or size of the eye are never influenced . Heinz Rembold 28 Figure 4 fr - - ,if SrINf Figure 5 The Role of Determinator in Caste Formation 29 Fig. 4. Longitudinal section through area of malformation. Thicke­ ned cornea and nuclei of outer pigment cells are localised in a distal position in the ommatidia.

C 78, 81-94 (1975). , Haustiere im vorkolumbisehen Mexico, Z. Tierpsychol. 17, 363-357 (1960). JUVENILE HORMONE AND QUEEN REARING IN BUMBLEBEES Peter-Frank Röseler Zoologisches Institut, Lehrstuhl für Zoologie II und ver­ gleichende Physiologie, Röntgenring 10, 8700 Würzburg, Germany The structure of castes In the bumblebee species Bombus hypnorum and Bombus terrestris the castes differ mainly in physiology (Ref 1, 2 ) . Body size is the only morphological difference between workers and queens« In B^ terrestris there is a clear distinction in size between the castes: queens are always larger than workers.

Geistbeck, The chemical basis of honeybee, Apis mellifera, caste formation. Partial purification of queen bee determinator from royal jelly. J. Insect Physiol. 20, 307-314 (1974). S. Dogra, H. Rembold, A comparative study of the endocrine system of the honey bee larvae under normal and experimental conditions. Z. Naturforsch. 1976, subm. for publ. (12) H. Rembold, Ch. Czoppelt, Effect of juvenile hormones on caste formation in the honey bee. In preparation. (13) M. H. Zibitt, Metabolism of Cecropia juvenile hormone in insects and in mammals.

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