THE HEMOCYTES OF CALLIPHORA VICINA LARVA. I. HISTOLOGICAL ANALYSIS
D. V. Tulin,1 O. Yu. Chaga 2
1 Department of Entomology, Biological Research Institute, St. Petersburg State University,
and 2 Department of Cytology and Histology, St. Petersburg State University, Russia;
1 e-mail: tudmva@yandex.ru
The rational classification of blood cells of a blowfly Calliphora vicina larva has been worked out basing on the
studies of hemocyte morphology and their dynamics while ageing. Eight morphological cell types can be found during the third age in
larva's hemolymph. Hemocytes of type I (prohemocytes) are undifferentiated cells, and, probably, serve as cambial elements of hemocytes
of other types. Hemocytes of types II (thrombocytoids), III (cell platelets), IV, and V (early- and late post-thrombocytoids) possibly
correspond to consecutive stages of a certain differentiation pattern. Hemocytes of types VI (filopodocytes), VII (crystal cells), and VIII
(histolysocytes) posses a number of specific features and represent three independent cell lines. The existence of four independent
cell lines in C. vicina hemolymph supports the polygenetic conception of hematopoiesis in insects. We compared our classification
with other existing classifications of C. vicina larva blood cells, and proposed a new nomenclature of these cells. The existence
of cells with crystal inclusions (type VII hemocytes) in C. vicina larva hemolymph has been shown for the first time. Data on two
generations of blood cells during larval development of C. vicina were obtained. Hemocytes of types II, VI and VII belong to the
first generation. These cells disappear completely at the stage of empty-pcropped larva, when hemocytes of the second generation i. e.
those of types III and VIII, appear in the hemolymph.
Key words: mammary secretory cells - maturation and secretory cycle, cytoskeleton system, microtubular functions,
coated and secretory vesicles
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