. Animal parasites and human disease. 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 amebse which are especially adapted to live as parasites in the bodies of animals belong to at least two distinct genera, Endamceba and Craigia (or Param&ba). Endamceba includes amebee of large size wh
. Animal parasites and human disease. 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 amebse which are especially adapted to live as parasites in the bodies of animals belong to at least two distinct genera, Endamceba and Craigia (or Param&ba). Endamceba includes amebee 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 amebse 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 FlG. 35. Chlamydophrys stercorea, show- true parasites of Cold-blooded inS Portion of protoplasm of body (prot.) •? ,-> ?. , ,r and slender anastomosing pseudopodia (ps.) animals. .Belonging tO tne protruding from transparent shell (sh.); n.( Sarcodina also, but not nucleus. X 300. (After Schaudinn, from closely related to the amebse, 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 Endamceba which live in the human body is still a matter of dispute. Due largely to the work of Darling in disentangling the species of amebee only two are now usually recognized as habitually inhabit
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