Paper 52. Christine K. A. Mango, L. Moreka. 1979. Moulting hormone activity in the fifth nymphal instar of the tick Ornithodoros porcinus porcinus. Pages 435-437. In: J. G. Rodriguez (editor). Recent Advances in Acarology. Volume I of 2. Proceedings of the V International Congress of Acarology, August 6-12, 1978 at Michigan State University, East Lansing, Michigan, New York: Academic Press, 631 pages.

Keywords: tick physiology, ticks as in insects develop and grow through intermittent replacement of their integument, in insects, ecdysone is responsible for molting, in ticks however only indirect evidence for the role of ecdysone exists, data in this study demonstrate molting hormone activity in the haemolymph of fifth instar nymphal Orithodoros p. porcinus ticks, the data indicate that the molting patterns and mechanisms of Arachnida are similar to those found in Insecta