Fine Structure of Differentiating Oocysts and Mature Sporozoites of Haemoproteus metchnikovi in its Intermediate Host Chrysops callidus

CHARLES R. STERLING, DOMINIC L. DeGIUSTI

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The fine structure of the sporogonic stages of Haemoproteus metchnikovi has been investigated by electron microscopy. Young oocysts are found beneath the basement membrane of midgut epithelial cells. These eventually protrude outward into the haemocoel space and are surrounded by a distinct oocyst capsule. Sporozoite formation begins with a subcapsular vacuolation. Evagination of the oocyst cytoplasm occurs in regions of membrane thickenings and 100–200 sporozoites are formed about a single sporoblastoid body. Remnants of the ookinete pellicle can be observed in maturing oocysts and always are found in the residual body. The fine structure of the mature sporozoite is essentially similar to that which has been described for other haemosporidia and a spherical body is described in association with the mitochondrion of the sporozoite. The sporogonic stages of H. metchnikovi have features common to the sporogonic stages of Plasmodium and Leucocytozoon that are not held in common by the latter 2 genera, including pattern of sporozoite formation and number of sporozoites formed, the presence of a cytostome and of “crystalloid” in the sporozoite.

Original languageEnglish (US)
Pages (from-to)276-283
Number of pages8
JournalThe Journal of protozoology
Volume21
Issue number2
DOIs
StatePublished - May 1974

Keywords

  • Chrysops callidus
  • Haemoproteus metchnikovi
  • deer fly
  • electron microscopy
  • oocyst
  • sporogony
  • sporozoite

ASJC Scopus subject areas

  • Parasitology

Fingerprint Dive into the research topics of 'Fine Structure of Differentiating Oocysts and Mature Sporozoites of Haemoproteus metchnikovi in its Intermediate Host Chrysops callidus'. Together they form a unique fingerprint.

  • Cite this