A Cytological Study of the Proliferation Patterns in Imaginal Disks of Calliphora Erythrocephala Meigen During Larval and Pupal Development

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Abstract
1. The wing and haltere disks of Calliphora show characteristic pro- liferation patterns during their development. There is a gradient in the proliferation rate from the bases to the tips of the main folds and a radial gradient from the periphery of the caudal disk parts to the centres of the pouches at both sides (medial and lateral), of the disks. The bases of the folds and the periphery of the disks always show the highest proliferation rates. If a fold arises from a flat part of epithe- lium, the presumptive folding area is characterized by a temporary increase of mitotic activity. 2. Until the middle of the resting period the area of the median cross- ridge and the additional rostral fold of the wing disks show more cell divisions than the caudal wing base and additional fold. This could be one of the major causes of wing pouch invagination into the peripodial cavity in the latero-caudal direction. 3. From the middle of the feeding period two cell populations seem to exist in the disk epithelium, a dividing and a non-dividing population. 4. The results of the analysis of the median crossridge show that roughly 60% of the mitotic spindles lie more or less perpendicular to the tangent plane at the tip of the fold. This is probably also the case in the other folds in the caudal parts of the wing and haltere disks. Because all of the folds mentioned above run more or less in ellipsoid rings around the centre of the pouches, it is reasonable to conclude that there is a radially oriented proliferation stowage from the bases to the tips of the folds and to the tip of the pouches during the morpho- genesis of these disks.

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