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A strain of the free-living flagellate Dimastigella trypaniformis Sandon was isolated from the gut contents of the Australian termite Mastotermes darwiniensis Froggatt. The fine structure of the isolate (Ulm strain) was compared with a strain isolated from soil in Scotland (Glasgow strain). The biflagellated trophozoites possess great morphological similarities with the bodonids and cryptobiids such as a polykinetoplastic mitochondrial complex, a flagellar paraxial rod, and a cytopharyngeal complex. However, characteristic features are also found such as the two opposed basal bodies and the two flagella, one anteriorly and the other recurrently directed, the latter adhering to a ventral furrow, a rostrum as well as a cytostome and a cytopharynx with rostral structures. These organisms have a typical motion with a highly flexible cell body. They are able to form resistant cysts in the culture. The two strains are distinguishable by small differences in their growth characteristics in different media and qualitative ultrastructural features. |
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