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Fine Structure of Normal Hemocytes in Dermacentor andersoni Stiles (Acari: Ixodidae)

Lyle P. Brinton and Willy Burgdorfer
The Journal of Parasitology
Vol. 57, No. 5 (Oct., 1971), pp. 1110-1127
DOI: 10.2307/3277874
Stable URL: http://www.jstor.org/stable/3277874
Page Count: 18
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Fine Structure of Normal Hemocytes in Dermacentor andersoni Stiles (Acari: Ixodidae)
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Abstract

The fine structure of Dermacentor andersoni hemocytes was studied in view of the importance of hemolymph in development and dissemination of tick-borne pathogenic agents to various tissues upon penetration of these organisms through the gut wall. Four primary cell types are reported: prohemocytes, spherular hemocytes, plasmatocytes, and oenocytes. Prohemocytes are smallest in size and always possess a high nucleocytoplasmic ratio and prominent rough endoplasmic reticulum (rer). Spherule hemocytes are most numerous and are divided into 4 types (sensu lato) based on gross form, cytoplasmic fine structure, and inclusion spherules. Each type contained prominent dictyosomes with many associated vesicles. Fusion of vesicles and contribution of material from cisternae of the rer resulted in formation of inclusion bodies. Plasmatocytes are always of irregular form, with prominent filopodia (pseudopodia). This was the only cell type exhibiting a consistent propensity for phagocytosis and apparently serves a scavenging role in the hemocoel. Oenocytes are large hemocytes with deep infoldings of the plasma membrane to form canaliculi. Their extensive rer suggests a primary function of polypeptide and protein production.

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