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In the four typological ecosystems of the central part of the steppe zone of Ukraine, the study of apicomplex parasites for one type of beetle has been carried out. Variability of morphometric indices for the Gigaductus exiguus (Wellmer, 1911), which occurs in the intestinal tract of Pterostichus melas (Creutzer, 1799) was studied. There are significant differences in the characteristics of infection in various types of geobotanical conditions.The species of the G. exiguus is a typical unicellular parasite for P. melas. In the work 13 micrographs of gregarines are presented at different stages of life, which are extracted from the intestines. The article includes four tables of the species identification of the morphometric indices. All measurements are indicated in micrometers. The linear dimension of the gregarines gamonts is significantly different in comparison with the data of other authors. The results of morphometry for 59 detected gregarines are given: 24 organisms are presented in the form of a syzygium and 35 in the form of a gemont. The low intensity and extensiveness of infestation by the pseudonyms for P. melas is noted. Linear characteristics and morphometric indices (n = 35) coincide with the literary data. The length of the conjugate (TL) varies from 13,65 to 46,99 (x ± SD – 26,60 ± 12,17) μm. The length of the (LP) varies between 2,44 and 10,19 (4,78 ± 2,24) μm. Deitomerite Length (LD) 10,77–41,79 (21,88 ± 10,22) μm. The width of the protomerite (WP) is 3,65–9,49 (5,51 ± 1,99) μm. The width of the deitomerite (WD) is within the range 3,85–10,58 (6,24 ± 2,28) μm. The ratio of the length of protomerite to the total length of the (LP / TL) is 0,11–0,22 (0,18 ± 0,03). The width of the protomerite to the width of the (WP / WD) is 0,77–1,03 (0,89 ± 0,07). The linear dimensions of the siziges (n = 24) coincide with the data of the researchers. The ratio of the (PTL / STL) was 0,77–1,15 (0,96 ± 0,09). The ratio of the protomerite length to the protomerite of the satellite (PPL / SPL) is 0,84–1,68 (1,25 ± 0,23). The ratio of the protomerite width of the primitive to the satellite (PPWM / SPWM) is 0,78–1,19 (1,04 ± 0,10). The ratio of the (PDL/SDL) – 0,71–1,12 (0,91 ± 0,10). The ratio of the deutorite sweep width to the satellite deutomerite width (PDWM / SDWM) is 0,89–1,18 (1,06 ± 0,07). The result of morphometry is the identification of the species as Gigaductus exiguus (Wellmer, 1911).

The article presents the species identification and variability of indices of morphometric indices for the species Gregaductus exiguus (Gigaductus) Wellmer, 1911, as a parasite of the intestinal tract of one of the mass species of ground beetles Calathus melanocephalus (Carabidae) Linnaeus, 1758. The result of the work is a morphometric analysis of 27 Gregarin indices determine the size of the parasite's cell, under the conditions of four typological ecosystems in the central part of the steppe zone of Ukraine. C. melanocephalus is defined as the most massive among the territorial conditions with different types of geobotanical formations and anthropogenic technogenic pressure. The level of invasion of Gregarin is closely related to the level of moisture within each trial area, which is formed under special microrelief conditions in the study sites. The interrelations between the indices of morphometric species identification of apicomplexes from their total number per one unit of the host have been revealed. Common methods of field entomology and laboratory studies are used to determine apicomplexes of the intestinal tract of ground beetles. Microscopy of the stomach tract of ground beetles uses a physiological solution that reduces the error of the osmotic pressure on the membrane of the gregarine cell while fixing the basic metric indicators of the form of the gregarins, which are the main indicators for the reliable identification of single-cell parasites to the taxonomic genus and species. The maximum and minimum rates of invasion were revealed. The most invasion by parasites was found in the conditions of the first trial area, the dolin-beam type of the landscape of the wall type forest. The number of individuals is 11,0 % of the total sample of entomological material, 27,2 % of them are infected, 30,7 % of males and 25,0 % of females. Population dynamics here is more stable, which causes a high number of infected individuals. The least indicator of infestation is characterized by a forest-park zone of the third trial area. The density of the population is 18,6 % of the total sample of C. malanocephalus among trial plots, the number of infected individuals is 15,1 %, the males among them are 23,0 %, and females – 10,0 %. In the conditions of this trial area, the pronounced anthropo-technogenic influences on the host and parasite are significant. There were no significant differences between the invasion in the sex structure of the population for the study period and separately for each month. All the same, a non-linear distribution of the number of parasites per one unit of the host is recorded in connection with gender. Among the main morphometric indicators, metric characteristics and their proportional relationship were used to reliably determine the appearance of apicomplexes of parasites. The work includes one table of morphometric indices and nine microphotographs of trophozoites and syzygia for Gigaductus exiguus from the stomach path of ground beetles. In the tabular data are given indexes of species identification with the indication of the minimum and maximum values.