. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 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, Endamoeha and Craigia (or Paramceha). Endamoeha includes amebse of large size which a
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 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, Endamoeha and Craigia (or Paramceha). Endamoeha includes amebse 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 Fig. 35. Chlamydophrys stercorea, show- true parasites of cold-blooded ^'^S portion of protoplasm of body (prot.) . _ , . , and slender anastomosing pseudopodia (ps.) ammalS. Belongmg to the protruding from transparent shell (sh.); n., Sarcodina also, but not nucleus. X 300. (After Schaudinn, from 11111 1 Doflein.) closely related to the amebse, is a pecuUalr parasite, Chlamydophrys stercorea (Fig. 35), found in freshly passed fseces 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 Endamceha which hve in the human body is still a matter of dispute. Due largely to the work of Darling in disentangling the species of amebse only two are now usually recognized as habitually inhabit
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