. Animal parasites and human disease. Insect Vectors; Parasites; Parasitic Diseases; Medical parasitology; Insects as carriers of disease. PARASITIC SARCODINA 129 The life history also varies in the different species, many possess- ing a flagellated stage. On the basis of life history and habits the old genus Amoeba has been broken into a number of genera, seven according to Calkins. Of these only three occur as para- sites of man. The amebae which are especially adapted to live as parasites in the bodies of animals belong to at least two distinct genera, Endamoeba and Craigia (or Paramoeba).
. Animal parasites and human disease. Insect Vectors; Parasites; Parasitic Diseases; Medical parasitology; Insects as carriers of disease. PARASITIC SARCODINA 129 The life history also varies in the different species, many possess- ing a flagellated stage. On the basis of life history and habits the old genus Amoeba has been broken into a number of genera, seven according to Calkins. Of these only three occur as para- sites of man. The amebae which are especially adapted to live as parasites in the bodies of animals belong to at least two distinct genera, Endamoeba and Craigia (or Paramoeba). EndamoBba includes amebae of large size which are not readily distinguishable from the free-living genera except in their parasitic manner of life and by the fact that they will not grow in pure cultures. Craigia includes parasitic species of amebae which, like some free-living forms, pass through a stage in which they possess flagella and resemble true flagellates. In addition to these, the genus Vahlkampfia includes species which may tempo- rarily live as parasites in man if accidentally swallowed. They are minute in size, nor- mally free-living, and have no flagellated stage of devel- opment. A few species are true parasites of cold-blooded animals. Belonging to the Sarcodina also, but not closely related to the amebae, is a peculiar parasite, Chlamydophrys stercorea (Fig. 35), found in freshly passed faeces of a number of animals, including man. It has a transparent glassy shell of pseudochitin, through the mouth of which it protrudes its slender pseudopodia. The number of distinct species of Endamoeba which live in the human body is still a matter of dispute. Due largely to the work of Darling in disentangling the species of amebae only two are now usually recognized as habitually inhabiting the human intestine. One of these, E. coli, is a very common but ap- parently harmless resident, while the other, E. histolytica, is a bandit of the first order, and the cause of amebi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectparasites, bookyear19
