ON THE SCHIZECKENOSY IN THE TROMBICULID MITES (ACARIFORMES, TROMBICULIDAE)

On the basis of long observations in laboratory culture and of origina l morphological investigations of digestive system and integumental ti ssue the detailed analysis of unique process of schizeckenosy (Mitchel l, Nadchatram, 1969) or mid-gut defecation in adults of trombiculid mi tes is videly considered. Among five observed species this phenomenon was registered only of two ones - Leptotrombidium orientate (15 cases) and Hirsutiella zachvatkini (2 cases). The process of mid-gut defecat ion has different morpho-physiological manifestation - from extension or splintering of the integument in a back part of histerosoma without any egress of some part of mid-gut (provocation of mid-gut defecation ) to destructive devastation of the body with simultaneous death. This process is a result of superfluous feeding of some individuals with a ges a half of the year or more in different generations in laboratory culture. It leads o significant deterioration of functional conditions of organism and in most occasions it is finished with death in a defi nite period of time. The phenomenon of mid-gut defecation it is imposs ible to consider as evolutional substitution of normal in all animals with open intestines process of anal defecation.